Re: [Nighthawk Lovers] rookie looking for suggestions
I'd say rod knock or exhaust leak. Feel around really close to all the exhaust ports and see if you can feel a pulse of air coming out. -James O On Aug 4, 2012, at 21:36 PM, Greg Holuban wrote: Did you put in new exhaust seals? Make sure they are tight. Date: Fri, 3 Aug 2012 17:02:22 -0300 Subject: Re: [Nighthawk Lovers] Re: rookie looking for suggestions From: duchen...@gmail.com To: nighthawk_lovers@googlegroups.com Just guessing (obviously) I'd say it's the top end not the bottom. A rod knock would only make half as many noises as a top end issue. Dave On 3 August 2012 16:24, Ross M. Jamison ross.m.jami...@earthlink.net wrote: Sounds like rod knock. Thank you, Ross M. Jamison Sent from my iPhone On Aug 3, 2012, at 1:13 PM, Matthew Webb matthew.web...@gmail.com wrote: Here'a a much belated update: I started removing and dissasembling my engine (photos here) which turned out to be a pretty big challenge without having much experience. But it was tons of fun and I learned a lot while struggling and cursing in my blazing hot shed. While I was doing this a used engine with 22k miles popped up on eBay and just so happened to be located in my city so I scooped it up. By some miracle, I manage to succesfully install the new engine, put all the pieces together, and get the bike started! I think I remember hearing a slight noise from the engine but I was probably too estatic notice. I took the bike for a short test ride and at some point during the ride I noticed a tapping noise coming from the engine. So I'm not exactly sure when the noise started. Its possible the engine had been sitting for a while before I bought it. During the ride the bike seemed to perform 100% fine, aside from the noise. Back at home I took a video to capture the noise. I used a tube to listen to the engine and I think the noise is coming from the back of the lower crankcase. From the reading I've down it sounds like that type of noise means a valve needs to be adjusted? But the Clymer reads the valves adjust themselves automatically? So maybe a piston ring is off or something? Can anyone watch the video and help ID the noise? At this point I think my best bet is to take it to a shop and have pros look at it. Even if I have to shell out an arm and a leg I just want to be on the road again. http://youtu.be/PurYX89KWzc Thanks! - Matt On Friday, April 20, 2012 10:44:30 PM UTC-4, Matthew Webb wrote: Hi my name is Matt. I'm new to the group and I recently got my first bike, a 1992 CB750 with 3,800 miles for $1,800. It was always garage kept and in very good condition. I had had the bike for only about 2 months but had put almost 2,000 miles on it already. At the time I was getting home from work in the dark and the cold and kept putting off my first bike maintenance until a weekend when I could do some work in the daylight. I made a big rookie mistake and ran my bike dry and the engine locked up when I stopped at a traffic light. The low oil indicator light had turned on that morning but I was hurrying to a meeting and thought I would be able to make it before things got serious. I got my bike back to my house, and a few weeks later poured some oil over the top of the engine, manually turned the engine, and then was able to get it to start with no problem. However, the engine didn't seem to respond right. So I looked into the top more and found some pretty serious scouring on the exhaust camshafts, exhaust camshaft holders, and crankcase. It also looks like some of the rubber stuff on the defoaming chamber covers melted, but I'm not sure. The rest of the top end looked completely fine, even the intake camshaft. See pictures for details but be warned, they are depressing. I am worried that pieces of metal may have gotten into the bottom of the engine and wrecked more havoc. I'm also wondering if there may be more damage than I've seen from when my engine locked up. Does anyone know what damage is typical when you run your engine dry? Is it likely the entire engine will need to be replaced? I have searched past messages but have not found much. Possibly because I don't know what is best to search for. I've done a lot of other reading so far and have some ideas but wanted to run it by the group first. To me it looks like I have a few options: 1) Sell the bike as is on CL for parts to someone who knows what they are doing 2) Purchase replacement parts for the damaged components and replace them. With a quick search I have found these on ebay: cylinder head, another cylinder head,camshafts. I don't have much experience working with engines but I do have a Clymer manual. The camshafts and holders look easy to replace but the body of the crankcase is also damaged where the camshafts sit. Would it be possible to have a shop re-machine
Re: [Nighthawk Lovers] rookie looking for suggestions
Quick update, I was able to spend some time working on my bike last weekend. Progress is going a little slow since this is my first time doing something like this and I have been labeling every like crazy so I can put it back together again. Photos and some sort of write up to follow. I will hopefully get the engine all the out this weekend. Good news, I think I may have found a new engine! http://richmond.craigslist.org/mcy/3020631571.html Sine it looks like the owner is asking 600 for the bike, but also parting it out, what would be a fair price for the engine? I'm sure it depends on how many miles are on it. - Matt -- You received this message because you are subscribed to the Google Groups Nighthawk Motorcycle Lovers! group. To view this discussion on the web visit https://groups.google.com/d/msg/nighthawk_lovers/-/WTo3LDJSLIEJ. To post to this group, send email to nighthawk_lovers@googlegroups.com. To unsubscribe from this group, send email to nighthawk_lovers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en.
Re: [Nighthawk Lovers] rookie looking for suggestions
I'd offer $300.if he wants more than that then try and deal for the bike and ebay the rest of the parts to make your money back. Sent via BlackBerry by ATT -Original Message- From: Matthew Webb matthew.web...@gmail.com Sender: nighthawk_lovers@googlegroups.com Date: Thu, 17 May 2012 06:32:29 To: nighthawk_lovers@googlegroups.com Reply-To: nighthawk_lovers@googlegroups.com Subject: Re: [Nighthawk Lovers] rookie looking for suggestions Quick update, I was able to spend some time working on my bike last weekend. Progress is going a little slow since this is my first time doing something like this and I have been labeling every like crazy so I can put it back together again. Photos and some sort of write up to follow. I will hopefully get the engine all the out this weekend. Good news, I think I may have found a new engine! http://richmond.craigslist.org/mcy/3020631571.html Sine it looks like the owner is asking 600 for the bike, but also parting it out, what would be a fair price for the engine? I'm sure it depends on how many miles are on it. - Matt -- You received this message because you are subscribed to the Google Groups Nighthawk Motorcycle Lovers! group. To view this discussion on the web visit https://groups.google.com/d/msg/nighthawk_lovers/-/WTo3LDJSLIEJ. To post to this group, send email to nighthawk_lovers@googlegroups.com. To unsubscribe from this group, send email to nighthawk_lovers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en. -- You received this message because you are subscribed to the Google Groups Nighthawk Motorcycle Lovers! group. To post to this group, send email to nighthawk_lovers@googlegroups.com. To unsubscribe from this group, send email to nighthawk_lovers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en.
Re: [Nighthawk Lovers] rookie looking for suggestions
Personally, I'd go option 2 or 4. Though if you go rebuild you will have to do a complete tear down and inspection. Wiped cams will put metal all through the engine. #4 would most likely be cheaper. A bike is just about worthless without the motor. So selling won't get you much. Now you know to check your oil, and to not ignore the oil pressure light. Sorry to hear that you had such an expensive lesson. Sent via BlackBerry by ATT -Original Message- From: Matthew Webb matthew.web...@gmail.com Sender: nighthawk_lovers@googlegroups.com Date: Fri, 20 Apr 2012 22:44:30 To: Nighthawk_lovers@googlegroups.com Reply-To: nighthawk_lovers@googlegroups.com Subject: [Nighthawk Lovers] rookie looking for suggestions Hi my name is Matt. I'm new to the group and I recently got my first bike, a 1992 CB750 with 3,800 miles for $1,800. It was always garage kept and in very good condition. I had had the bike for only about 2 months but had put almost 2,000 miles on it already. At the time I was getting home from work in the dark and the cold and kept putting off my first bike maintenance until a weekend when I could do some work in the daylight. I made a big rookie mistake and ran my bike dry and the engine locked up when I stopped at a traffic light. The low oil indicator light had turned on that morning but I was hurrying to a meeting and thought I would be able to make it before things got serious. I got my bike back to my house, and a few weeks later poured some oil over the top of the engine, manually turned the engine, and then was able to get it to start with no problem. However, the engine didn't seem to respond right. So I looked into the top more and found some pretty serious scouring on the exhaust camshafts, exhaust camshaft holders, and crankcase. It also looks like some of the rubber stuff on the defoaming chamber covers melted, but I'm not sure. The rest of the top end looked completely fine, even the intake camshaft. See pictureshttps://plus.google.com/photos/118089145265544102347/albums/5733673720992831665?authkey=CKH1v53yteGPnAEfor details but be warned, they are depressing. I am worried that pieces of metal may have gotten into the bottom of the engine and wrecked more havoc. I'm also wondering if there may be more damage than I've seen from when my engine locked up. Does anyone know what damage is typical when you run your engine dry? Is it likely the entire engine will need to be replaced? I have searched past messages but have not found much. Possibly because I don't know what is best to search for. I've done a lot of other reading so far and have some ideas but wanted to run it by the group first. To me it looks like I have a few options: 1) Sell the bike as is on CL for parts to someone who knows what they are doing 2) Purchase replacement parts for the damaged components and replace them. With a quick search I have found these on ebay: cylinder headhttp://www.ebay.com/itm/CYLINDER-HEAD-CB750-NIGHTHAWK-91-93-92-1991-1992-1993-VALVE-TOP-END-ENGINE-MOTOR-/140691166315?pt=Motorcycles_Parts_Accessoriesvxp=mtrhash=item20c1d8d46b , another cylinder headhttp://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine-Cylinder-Head-1992-BDK-/150711279313?pt=Motorcycles_Parts_Accessoriesvxp=mtrhash=item2317179ed1, camshafts.http://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine-Cam-Camshaft-Pair-1992-BDK-/400261036787?pt=Motorcycles_Parts_Accessoriesvxp=mtrhash=item5d316abaf3 I don't have much experience working with engines but I do have a Clymer manual. The camshafts and holders look easy to replace but the body of the crankcase is also damaged where the camshafts sit. Would it be possible to have a shop re-machine it so that I wouldn't need to replace it? 3) Take it to a shop, have them replace the parts and open the bottom of the engine to look for more damage. 4) Purchase another CB750 and use my first one as a parts bike. Also part out my first one on ebay since the rest of the bike is in excellent condition. Any suggestions would be appreciated, thanks. - Matt -- You received this message because you are subscribed to the Google Groups Nighthawk Motorcycle Lovers! group. To post to this group, send email to nighthawk_lovers@googlegroups.com. To unsubscribe from this group, send email to nighthawk_lovers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en. -- You received this message because you are subscribed to the Google Groups Nighthawk Motorcycle Lovers! group. To post to this group, send email to nighthawk_lovers@googlegroups.com. To unsubscribe from this group, send email to nighthawk_lovers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en.
RE: [Nighthawk Lovers] rookie looking for suggestions
Hi Matt, Sorry to hear about your trouble. I have feared doing that too, and double check it when I change the oil. I caught that mistake one time. A garage professional that dad went to did that, and they had to buy him a new motor. I was a toolmaker in my first career. My father had a tool shop. I can tell you that boring a cylinder is not to difficult for set up time, if they have the equiptment, but the cam shaft seats, if they are horizontal, (I didn't look at your pic yet) but the camshaft boring is much more difficult. You will have to scout around and compare shops. Each shop has a different rate, and expertise. Small shops will typically have lower overhead and prices. Maybe even a shop that specializes in bike engines. My thought on it is it would be better to find a different engine and if necessary rebuilt it. You will find tool work is not cheap, and has to be very precise to fit bearing. ron _ From: nighthawk_lovers@googlegroups.com [mailto:nighthawk_lovers@googlegroups.com] On Behalf Of Matthew Webb Sent: Friday, April 20, 2012 9:45 PM To: Nighthawk_lovers@googlegroups.com Subject: [Nighthawk Lovers] rookie looking for suggestions Hi my name is Matt. I'm new to the group and I recently got my first bike, a 1992 CB750 with 3,800 miles for $1,800. It was always garage kept and in very good condition. I had had the bike for only about 2 months but had put almost 2,000 miles on it already. At the time I was getting home from work in the dark and the cold and kept putting off my first bike maintenance until a weekend when I could do some work in the daylight. I made a big rookie mistake and ran my bike dry and the engine locked up when I stopped at a traffic light. The low oil indicator light had turned on that morning but I was hurrying to a meeting and thought I would be able to make it before things got serious. I got my bike back to my house, and a few weeks later poured some oil over the top of the engine, manually turned the engine, and then was able to get it to start with no problem. However, the engine didn't seem to respond right. So I looked into the top more and found some pretty serious scouring on the exhaust camshafts, exhaust camshaft holders, and crankcase. It also looks like some of the rubber stuff on the defoaming chamber covers melted, but I'm not sure. The rest of the top end looked completely fine, even the intake camshaft. See pictures https://plus.google.com/photos/118089145265544102347/albums/573367372099283 1665?authkey=CKH1v53yteGPnAE for details but be warned, they are depressing. I am worried that pieces of metal may have gotten into the bottom of the engine and wrecked more havoc. I'm also wondering if there may be more damage than I've seen from when my engine locked up. Does anyone know what damage is typical when you run your engine dry? Is it likely the entire engine will need to be replaced? I have searched past messages but have not found much. Possibly because I don't know what is best to search for. I've done a lot of other reading so far and have some ideas but wanted to run it by the group first. To me it looks like I have a few options: 1) Sell the bike as is on CL for parts to someone who knows what they are doing 2) Purchase replacement parts for the damaged components and replace them. With a quick search I have found these on ebay: cylinder http://www.ebay.com/itm/CYLINDER-HEAD-CB750-NIGHTHAWK-91-93-92-1991-1992-19 93-VALVE-TOP-END-ENGINE-MOTOR-/140691166315?pt=Motorcycles_Parts_Accessories vxp=mtrhash=item20c1d8d46b head, another http://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine- Cylinder-Head-1992-BDK-/150711279313?pt=Motorcycles_Parts_Accessoriesvxp=mt rhash=item2317179ed1 cylinder head, camshafts. http://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine- Cam-Camshaft-Pair-1992-BDK-/400261036787?pt=Motorcycles_Parts_Accessoriesvx p=mtrhash=item5d316abaf3 I don't have much experience working with engines but I do have a Clymer manual. The camshafts and holders look easy to replace but the body of the crankcase is also damaged where the camshafts sit. Would it be possible to have a shop re-machine it so that I wouldn't need to replace it? 3) Take it to a shop, have them replace the parts and open the bottom of the engine to look for more damage. 4) Purchase another CB750 and use my first one as a parts bike. Also part out my first one on ebay since the rest of the bike is in excellent condition. Any suggestions would be appreciated, thanks. - Matt -- You received this message because you are subscribed to the Google Groups Nighthawk Motorcycle Lovers! group. To post to this group, send email to nighthawk_lovers@googlegroups.com. To unsubscribe from this group, send email to nighthawk_lovers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en. -- You received
RE: [Nighthawk Lovers] rookie looking for suggestions
OK Matt I looked at the pics. I have never had my 750 apart. Get another engine, and don't parts the bike. It looks great! That's your best route. Ron _ From: nighthawk_lovers@googlegroups.com [mailto:nighthawk_lovers@googlegroups.com] On Behalf Of Pastor Ron Sent: Saturday, April 21, 2012 10:24 AM To: nighthawk_lovers@googlegroups.com Subject: RE: [Nighthawk Lovers] rookie looking for suggestions Hi Matt, Sorry to hear about your trouble. I have feared doing that too, and double check it when I change the oil. I caught that mistake one time. A garage professional that dad went to did that, and they had to buy him a new motor. I was a toolmaker in my first career. My father had a tool shop. I can tell you that boring a cylinder is not to difficult for set up time, if they have the equiptment, but the cam shaft seats, if they are horizontal, (I didn't look at your pic yet) but the camshaft boring is much more difficult. You will have to scout around and compare shops. Each shop has a different rate, and expertise. Small shops will typically have lower overhead and prices. Maybe even a shop that specializes in bike engines. My thought on it is it would be better to find a different engine and if necessary rebuilt it. You will find tool work is not cheap, and has to be very precise to fit bearing. ron _ From: nighthawk_lovers@googlegroups.com [mailto:nighthawk_lovers@googlegroups.com] On Behalf Of Matthew Webb Sent: Friday, April 20, 2012 9:45 PM To: Nighthawk_lovers@googlegroups.com Subject: [Nighthawk Lovers] rookie looking for suggestions Hi my name is Matt. I'm new to the group and I recently got my first bike, a 1992 CB750 with 3,800 miles for $1,800. It was always garage kept and in very good condition. I had had the bike for only about 2 months but had put almost 2,000 miles on it already. At the time I was getting home from work in the dark and the cold and kept putting off my first bike maintenance until a weekend when I could do some work in the daylight. I made a big rookie mistake and ran my bike dry and the engine locked up when I stopped at a traffic light. The low oil indicator light had turned on that morning but I was hurrying to a meeting and thought I would be able to make it before things got serious. I got my bike back to my house, and a few weeks later poured some oil over the top of the engine, manually turned the engine, and then was able to get it to start with no problem. However, the engine didn't seem to respond right. So I looked into the top more and found some pretty serious scouring on the exhaust camshafts, exhaust camshaft holders, and crankcase. It also looks like some of the rubber stuff on the defoaming chamber covers melted, but I'm not sure. The rest of the top end looked completely fine, even the intake camshaft. See pictures https://plus.google.com/photos/118089145265544102347/albums/573367372099283 1665?authkey=CKH1v53yteGPnAE for details but be warned, they are depressing. I am worried that pieces of metal may have gotten into the bottom of the engine and wrecked more havoc. I'm also wondering if there may be more damage than I've seen from when my engine locked up. Does anyone know what damage is typical when you run your engine dry? Is it likely the entire engine will need to be replaced? I have searched past messages but have not found much. Possibly because I don't know what is best to search for. I've done a lot of other reading so far and have some ideas but wanted to run it by the group first. To me it looks like I have a few options: 1) Sell the bike as is on CL for parts to someone who knows what they are doing 2) Purchase replacement parts for the damaged components and replace them. With a quick search I have found these on ebay: cylinder http://www.ebay.com/itm/CYLINDER-HEAD-CB750-NIGHTHAWK-91-93-92-1991-1992-19 93-VALVE-TOP-END-ENGINE-MOTOR-/140691166315?pt=Motorcycles_Parts_Accessories vxp=mtrhash=item20c1d8d46b head, another http://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine- Cylinder-Head-1992-BDK-/150711279313?pt=Motorcycles_Parts_Accessoriesvxp=mt rhash=item2317179ed1 cylinder head, camshafts. http://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine- Cam-Camshaft-Pair-1992-BDK-/400261036787?pt=Motorcycles_Parts_Accessoriesvx p=mtrhash=item5d316abaf3 I don't have much experience working with engines but I do have a Clymer manual. The camshafts and holders look easy to replace but the body of the crankcase is also damaged where the camshafts sit. Would it be possible to have a shop re-machine it so that I wouldn't need to replace it? 3) Take it to a shop, have them replace the parts and open the bottom of the engine to look for more damage. 4) Purchase another CB750 and use my first one as a parts bike. Also part out my first one on ebay since the rest of the bike is in excellent condition. Any suggestions would
RE: [Nighthawk Lovers] rookie looking for suggestions
Matt, If you are not overwhelmed yet, here are some parts. If the cylinders are scored, and they probably are, you would need to bore the cylinders and put in oversized rings. http://www.ebay.com/itm/CYLINDER-HEAD-CB750-NIGHTHAWK-91-93-92-1991-1992-199 3-VALVE-TOP-END-ENGINE-MOTOR-/140691166315?pt=Motorcycles_Parts_Accessories hash=item20c1d8d46bvxp=mtr http://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine-P iston-Rings-Kit-1992-BDK-/110786745327?pt=Motorcycles_Parts_Accessories http://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine- Piston-Rings-Kit-1992-BDK-/110786745327?pt=Motorcycles_Parts_Accessorieshas h=item19cb6793efvxp=mtr hash=item19cb6793efvxp=mtr It is possible to repair, but at what cost, and you want to be able to trust it when you are done. Which is just about impossible on your first rebuild. Unless you can get a shop to do all the work at a reasonable price. If it cost's you a $1000 including parts, you would still be ahead, because it would be a new engine. Ron _ From: nighthawk_lovers@googlegroups.com [mailto:nighthawk_lovers@googlegroups.com] On Behalf Of Matthew Webb Sent: Friday, April 20, 2012 9:45 PM To: Nighthawk_lovers@googlegroups.com Subject: [Nighthawk Lovers] rookie looking for suggestions Hi my name is Matt. I'm new to the group and I recently got my first bike, a 1992 CB750 with 3,800 miles for $1,800. It was always garage kept and in very good condition. I had had the bike for only about 2 months but had put almost 2,000 miles on it already. At the time I was getting home from work in the dark and the cold and kept putting off my first bike maintenance until a weekend when I could do some work in the daylight. I made a big rookie mistake and ran my bike dry and the engine locked up when I stopped at a traffic light. The low oil indicator light had turned on that morning but I was hurrying to a meeting and thought I would be able to make it before things got serious. I got my bike back to my house, and a few weeks later poured some oil over the top of the engine, manually turned the engine, and then was able to get it to start with no problem. However, the engine didn't seem to respond right. So I looked into the top more and found some pretty serious scouring on the exhaust camshafts, exhaust camshaft holders, and crankcase. It also looks like some of the rubber stuff on the defoaming chamber covers melted, but I'm not sure. The rest of the top end looked completely fine, even the intake camshaft. See pictures https://plus.google.com/photos/118089145265544102347/albums/573367372099283 1665?authkey=CKH1v53yteGPnAE for details but be warned, they are depressing. I am worried that pieces of metal may have gotten into the bottom of the engine and wrecked more havoc. I'm also wondering if there may be more damage than I've seen from when my engine locked up. Does anyone know what damage is typical when you run your engine dry? Is it likely the entire engine will need to be replaced? I have searched past messages but have not found much. Possibly because I don't know what is best to search for. I've done a lot of other reading so far and have some ideas but wanted to run it by the group first. To me it looks like I have a few options: 1) Sell the bike as is on CL for parts to someone who knows what they are doing 2) Purchase replacement parts for the damaged components and replace them. With a quick search I have found these on ebay: cylinder http://www.ebay.com/itm/CYLINDER-HEAD-CB750-NIGHTHAWK-91-93-92-1991-1992-19 93-VALVE-TOP-END-ENGINE-MOTOR-/140691166315?pt=Motorcycles_Parts_Accessories vxp=mtrhash=item20c1d8d46b head, another http://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine- Cylinder-Head-1992-BDK-/150711279313?pt=Motorcycles_Parts_Accessoriesvxp=mt rhash=item2317179ed1 cylinder head, camshafts. http://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine- Cam-Camshaft-Pair-1992-BDK-/400261036787?pt=Motorcycles_Parts_Accessoriesvx p=mtrhash=item5d316abaf3 I don't have much experience working with engines but I do have a Clymer manual. The camshafts and holders look easy to replace but the body of the crankcase is also damaged where the camshafts sit. Would it be possible to have a shop re-machine it so that I wouldn't need to replace it? 3) Take it to a shop, have them replace the parts and open the bottom of the engine to look for more damage. 4) Purchase another CB750 and use my first one as a parts bike. Also part out my first one on ebay since the rest of the bike is in excellent condition. Any suggestions would be appreciated, thanks. - Matt -- You received this message because you are subscribed to the Google Groups Nighthawk Motorcycle Lovers! group. To post to this group, send email to nighthawk_lovers@googlegroups.com. To unsubscribe from this group, send email to nighthawk_lovers+unsubscr
[Nighthawk Lovers] rookie looking for suggestions
Hi my name is Matt. I'm new to the group and I recently got my first bike, a 1992 CB750 with 3,800 miles for $1,800. It was always garage kept and in very good condition. I had had the bike for only about 2 months but had put almost 2,000 miles on it already. At the time I was getting home from work in the dark and the cold and kept putting off my first bike maintenance until a weekend when I could do some work in the daylight. I made a big rookie mistake and ran my bike dry and the engine locked up when I stopped at a traffic light. The low oil indicator light had turned on that morning but I was hurrying to a meeting and thought I would be able to make it before things got serious. I got my bike back to my house, and a few weeks later poured some oil over the top of the engine, manually turned the engine, and then was able to get it to start with no problem. However, the engine didn't seem to respond right. So I looked into the top more and found some pretty serious scouring on the exhaust camshafts, exhaust camshaft holders, and crankcase. It also looks like some of the rubber stuff on the defoaming chamber covers melted, but I'm not sure. The rest of the top end looked completely fine, even the intake camshaft. See pictureshttps://plus.google.com/photos/118089145265544102347/albums/5733673720992831665?authkey=CKH1v53yteGPnAEfor details but be warned, they are depressing. I am worried that pieces of metal may have gotten into the bottom of the engine and wrecked more havoc. I'm also wondering if there may be more damage than I've seen from when my engine locked up. Does anyone know what damage is typical when you run your engine dry? Is it likely the entire engine will need to be replaced? I have searched past messages but have not found much. Possibly because I don't know what is best to search for. I've done a lot of other reading so far and have some ideas but wanted to run it by the group first. To me it looks like I have a few options: 1) Sell the bike as is on CL for parts to someone who knows what they are doing 2) Purchase replacement parts for the damaged components and replace them. With a quick search I have found these on ebay: cylinder headhttp://www.ebay.com/itm/CYLINDER-HEAD-CB750-NIGHTHAWK-91-93-92-1991-1992-1993-VALVE-TOP-END-ENGINE-MOTOR-/140691166315?pt=Motorcycles_Parts_Accessoriesvxp=mtrhash=item20c1d8d46b , another cylinder headhttp://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine-Cylinder-Head-1992-BDK-/150711279313?pt=Motorcycles_Parts_Accessoriesvxp=mtrhash=item2317179ed1, camshafts.http://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine-Cam-Camshaft-Pair-1992-BDK-/400261036787?pt=Motorcycles_Parts_Accessoriesvxp=mtrhash=item5d316abaf3 I don't have much experience working with engines but I do have a Clymer manual. The camshafts and holders look easy to replace but the body of the crankcase is also damaged where the camshafts sit. Would it be possible to have a shop re-machine it so that I wouldn't need to replace it? 3) Take it to a shop, have them replace the parts and open the bottom of the engine to look for more damage. 4) Purchase another CB750 and use my first one as a parts bike. Also part out my first one on ebay since the rest of the bike is in excellent condition. Any suggestions would be appreciated, thanks. - Matt -- You received this message because you are subscribed to the Google Groups Nighthawk Motorcycle Lovers! group. To post to this group, send email to nighthawk_lovers@googlegroups.com. To unsubscribe from this group, send email to nighthawk_lovers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en.
Re: [Nighthawk Lovers] rookie looking for suggestions
Hey Matt, welcome to the group. It's really a shame what happened to your bike. You got a good deal on it for that low of mileage. I'm not a mechanic so I can't counsel you in that respect but it would be a darn shame for that bike to be mothballed. Since everything else about it is in such great shape it sure seems reasonable to pursue some kind of rebuild option. If the repair option is too steep I would recommend attempting to find a replacement motor. Just my 2 cents. I can tell you that if you decide to rebuild the motor, the members of this discussion group will help you every step of the way. There are some people here who have been through rebuilding projects of their own and could certainly assist. Let us know. Paul Sent from my Xoom Tablet powered by Android 4.0 On Apr 20, 2012 8:46 PM, Matthew Webb matthew.web...@gmail.com wrote: Hi my name is Matt. I'm new to the group and I recently got my first bike, a 1992 CB750 with 3,800 miles for $1,800. It was always garage kept and in very good condition. I had had the bike for only about 2 months but had put almost 2,000 miles on it already. At the time I was getting home from work in the dark and the cold and kept putting off my first bike maintenance until a weekend when I could do some work in the daylight. I made a big rookie mistake and ran my bike dry and the engine locked up when I stopped at a traffic light. The low oil indicator light had turned on that morning but I was hurrying to a meeting and thought I would be able to make it before things got serious. I got my bike back to my house, and a few weeks later poured some oil over the top of the engine, manually turned the engine, and then was able to get it to start with no problem. However, the engine didn't seem to respond right. So I looked into the top more and found some pretty serious scouring on the exhaust camshafts, exhaust camshaft holders, and crankcase. It also looks like some of the rubber stuff on the defoaming chamber covers melted, but I'm not sure. The rest of the top end looked completely fine, even the intake camshaft. See pictureshttps://plus.google.com/photos/118089145265544102347/albums/5733673720992831665?authkey=CKH1v53yteGPnAEfor details but be warned, they are depressing. I am worried that pieces of metal may have gotten into the bottom of the engine and wrecked more havoc. I'm also wondering if there may be more damage than I've seen from when my engine locked up. Does anyone know what damage is typical when you run your engine dry? Is it likely the entire engine will need to be replaced? I have searched past messages but have not found much. Possibly because I don't know what is best to search for. I've done a lot of other reading so far and have some ideas but wanted to run it by the group first. To me it looks like I have a few options: 1) Sell the bike as is on CL for parts to someone who knows what they are doing 2) Purchase replacement parts for the damaged components and replace them. With a quick search I have found these on ebay: cylinder headhttp://www.ebay.com/itm/CYLINDER-HEAD-CB750-NIGHTHAWK-91-93-92-1991-1992-1993-VALVE-TOP-END-ENGINE-MOTOR-/140691166315?pt=Motorcycles_Parts_Accessoriesvxp=mtrhash=item20c1d8d46b , another cylinder headhttp://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine-Cylinder-Head-1992-BDK-/150711279313?pt=Motorcycles_Parts_Accessoriesvxp=mtrhash=item2317179ed1, camshafts.http://www.ebay.com/itm/Honda-CB750-SC-Nighthawk-Good-Used-Original-Engine-Cam-Camshaft-Pair-1992-BDK-/400261036787?pt=Motorcycles_Parts_Accessoriesvxp=mtrhash=item5d316abaf3 I don't have much experience working with engines but I do have a Clymer manual. The camshafts and holders look easy to replace but the body of the crankcase is also damaged where the camshafts sit. Would it be possible to have a shop re-machine it so that I wouldn't need to replace it? 3) Take it to a shop, have them replace the parts and open the bottom of the engine to look for more damage. 4) Purchase another CB750 and use my first one as a parts bike. Also part out my first one on ebay since the rest of the bike is in excellent condition. Any suggestions would be appreciated, thanks. - Matt -- You received this message because you are subscribed to the Google Groups Nighthawk Motorcycle Lovers! group. To post to this group, send email to nighthawk_lovers@googlegroups.com. To unsubscribe from this group, send email to nighthawk_lovers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en. -- You received this message because you are subscribed to the Google Groups Nighthawk Motorcycle Lovers! group. To post to this group, send email to nighthawk_lovers@googlegroups.com. To unsubscribe from this group, send email to nighthawk_lovers+unsubscr...@googlegroups.com. For more options, visit this group at
