Thanks Drew. I’ll take this opportunity...... 1986 Nighthawk S . 20K miles in great shape. When I put it away at the end of last season (fresh oil / filter, full tank of stabilized gas, drained-carbs), all was well. Return to service this season, all remained well except it has a new and distinct mechanical-knock at idle. It clears up completely at ~ 1500 rpm and above. I doesn’t sound (to my ears) like it’s valve-noise. Could be cam chain / tensioner related. I’ve recorded the sound but the recording does not present the actual sound well. Any thoughts ? Thanks.
From: Drew Gormley Sent: Saturday, September 4, 2021 10:59 PM To: [email protected] Subject: Re: [Nighthawk Lovers] 1984 nighthawk 650 puffing/popping on deceleration and other issues UPDATE I got you buddy. My bike smokes when I take it out of storage. Runs a little rich. I had learned to repair vintage bikes when I used one as a daily driver. It was fix it or ride my bike! The nighthawk, when all is well, is like the toyota corolla. It just runs perfectly, and other than the low charging at idle rpms, the bike never dies so long as you change the oil at 1000 miles every time. I got a junker for 250, cleaned the carbs, sorted out some jumbled coils and wires, removed a gallon of water from the oil ( I think some yahoos drove it into a lake) and removed a chipmunks nest from the airbox. I had a buy a used CDI to solve my ignition issues. Turned out that was the problem. two years later some plug wires and plug boots became a must buy as well. I ran it with foam filters for a whole year before I figured out how to remount the airbox rubbers without breaking them. The bike IS sensitive to air volume. Because it is so reliable, there is no room for error in terms of how much air flow reaches each cylinder, so do make sure your filter is properly installed... more soon On Sat, Sep 4, 2021 at 10:36 PM David Shevlin <[email protected]> wrote: Drew.....thanks for staying on this subject and providing your input. “Dan’s MC Page” is new to me. From: Drew Gormley Sent: Saturday, September 4, 2021 10:17 AM To: [email protected] Subject: Re: [Nighthawk Lovers] 1984 nighthawk 650 puffing/popping on deceleration and other issues UPDATE http://www.dansmc.com/leakdown.htm From Dan's MC page On Sat, Sep 4, 2021 at 11:34 AM 'AGL' via Nighthawk Motorcycle Lovers! <[email protected]> wrote: Okay just finished doing the leak down test at 90 psi hopefully I did everything correctly cylinder #1 8-10 psi loss #2 2-3 psi #3 1-2 psi #4 2 psi. I'm guessing this is acceptable so my culprit must be the carburetor? Maybe this time I will separate the carbs and thoroughly clean them. On Wednesday, September 1, 2021 at 4:51:33 PM UTC-7 AGL wrote: I got the fuel filter taken off, but I haven't ridden it yet been a little busy with work. I just got the leakdown test kit this morning so I'll have everything ready to test it this weekend. On Wednesday, September 1, 2021 at 6:42:39 AM UTC-7 [email protected] wrote: You have great compression. Problem eliminated, now you chase the other stuff (and become the local guy to loan out his compression tester) Now you want to do a leakdown test. The fittings from the compression tester will be needed. Have you downloaded the factory service manual from the forum? On Wed, Sep 1, 2021 at 8:10 AM 'AGL' via Nighthawk Motorcycle Lovers! <[email protected]> wrote: Alright received the compression tester today here are the results cylinder #1 140-145 #2 115-120 #3 135-140 #4 140-145. I added some oil to cylinder #2 and the psi jumped 150+ guess I've got worn out rings on #2? Well I'm in the market for a new bike not really in the mood to rip apart a motorcycle engine, don't even know where to begin. On Tuesday, August 24, 2021 at 8:40:14 PM UTC-7 AGL wrote: Yeah, that could be possible since I added a fuel filter several months ago. I'll try it out tomorrow and let you know if it works thanks for the suggestion. On Sunday, August 22, 2021 at 2:56:37 PM UTC-7 [email protected] wrote: +1 on checking the in tank filter and petcock filter. My 650 came with a cheap inline filter the PO had installed and I had the same problem with it cutting out after a while on the freeway. Pull over and let it sit and it would start and ride again. Anything restricting fuel flow will cause this. On Sun, Aug 22, 2021, 08:58 'AGL' via Nighthawk Motorcycle Lovers! <[email protected]> wrote: Just ordered a leakdown and compression tester kit I'll let you know the results when I get my hands on it thanks for the advice On Saturday, August 21, 2021 at 8:48:37 PM UTC-7 [email protected] wrote: Google aviation leakdown test. It means you need to send low psi compressed air into the cylinder, and listen for a leak. Eliminate valves being open, and rings gone bad. Do the test dry, or with the cylinders not oily, and then wet, to find out if it is a leak down from the rings. On Sun, Aug 22, 2021 at 8:46 AM 'AGL' via Nighthawk Motorcycle Lovers! <[email protected]> wrote: but I've had these issues since the beginning beside the new bogging down on the highway problem On Saturday, August 21, 2021 at 5:44:54 PM UTC-7 AGL wrote: Vacuum line is fine forgot to mention I did replace the petcock last week due to the original not flowing properly On Saturday, August 21, 2021 at 5:42:23 PM UTC-7 [email protected] wrote: Check the vacuum line from carb to petcock and gas cap air vent On Sat, Aug 21, 2021 at 8:32 PM 'AGL' via Nighthawk Motorcycle Lovers! <[email protected]> wrote: The bike sat for 20 something years with 14,000 miles before I got ahold of it I cleaned the carbs twice but didn't separate them. Now it runs decent smells a little rich at times, but the spark plugs don't indicate it. Sometimes when its colder, I need to give it a little throttle to even get it started then I'll add some choke until it warms up this is when it usually smells rich. Also, last night when I was on the highway doing 70-80 mph it bogged down and died 3 times but started right back up on the side of the road. This is the first time I've had any issues on the highway as I've put about 2000 miles on it so far. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/nighthawk_lovers/e0ae290b-ee80-4642-b897-798cc19504b9n%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/nighthawk_lovers/ac3e728c-24bf-4111-83e0-9a60bc282c7fn%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/nighthawk_lovers/85b43545-71ac-4b8f-8f09-a48eb4c95a8an%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/nighthawk_lovers/184345f1-e298-461c-ab1a-0fcec73e8157n%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/nighthawk_lovers/6f79f76f-669f-4dd3-9acb-0550357d2cc4n%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/nighthawk_lovers/CAJLiyZcAHXyQk8yfRUodeNbXURfGFeVPAD%2BA%3DtMaTeTxwrH0yw%40mail.gmail.com. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/nighthawk_lovers/70382658749541F4A56E9C31D9443524%40DavesWootHP. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/nighthawk_lovers/CAJLiyZdOjbs11b65p1Rp5DJEBTJXG%2BDadRSZ-b2fevEeG8cgyA%40mail.gmail.com. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/nighthawk_lovers/1C04C58658BC433E9D745ABBD9E16BA4%40DavesWootHP.
