That's what I thought, stock they are set for 2 3/4 turns and that's too lean. Once you get the bike warmed up if you blip the throttle does it drop below idle (rich), or hover a bit and then drop (lean). If not than your good to go. Sent via BlackBerry by AT&T
-----Original Message----- From: Ralf Oehlerich <[email protected]> Sender: [email protected] Date: Wed, 29 Feb 2012 15:10:13 To: <[email protected]> Reply-To: [email protected] Subject: Re: [Nighthawk Lovers] 81 CB750C Carbs idling at 3500??? I set it at 3 turns out. On Wed, Feb 29, 2012 at 2:29 PM, Allen Thomas <[email protected]> wrote: > How many turns out on the fuel screws? Just curious. > Sent via BlackBerry by AT&T > ------------------------------ > *From: *Ralf Oehlerich <[email protected]> > *Sender: *[email protected] > *Date: *Wed, 29 Feb 2012 11:46:14 -0500 > *To: *[email protected]<[email protected]> > *ReplyTo: *[email protected] > *Subject: *Re: [Nighthawk Lovers] 81 CB750C Carbs idling at 3500??? > > Cb750 is all good. Had to clean out idle jets and bench sync carbs > > Sent from my iPhone > > > On Feb 28, 2012, at 10:45 PM, "Allen Thomas" <[email protected]> > wrote: > > PS the PO probably backed out the fuel screws to compensate for dirty > carbs. Now that you cleaned them the cylinders are getting too much fuel. > I'm not familiar with your specific model, but on later models about 3 > turns out is about right, I'd start there. Of course I could be wrong with > all of this, but we have seen that issue before. Let us know the fix when > you get it sorted out. > Sent via BlackBerry by AT&T > ------------------------------ > *From: *"Allen Thomas" <[email protected]> > *Date: *Wed, 29 Feb 2012 03:26:45 +0000 > *To: *Nightwawk Lovers<[email protected]> > *ReplyTo: *[email protected] > *Subject: *Re: [Nighthawk Lovers] 81 CB750C Carbs idling at 3500??? > > From the factory Honda sets them so lean that if you touch the throttle > the engine will die. If you have to crack the throttle to get it to start > then I'd say it is way too rich. When it warms up does the exhaust start > popping? (Rich condition) IMHO you can't do an effective carb cleaning with > out removing the pilot screws. That could be why #2 isn't firing, its idle > circuit sounds clogged. +1 on doing a bench sync of the butterflies, it may > not be perfect but that will get the carbs close enough for it to run right > once you get the mixture correct. > Sent via BlackBerry by AT&T > ------------------------------ > *From: *Ralf Oehlerich <[email protected]> > *Sender: *[email protected] > *Date: *Tue, 28 Feb 2012 22:14:41 -0500 > *To: *<[email protected]> > *ReplyTo: *[email protected] > *Subject: *Re: [Nighthawk Lovers] 81 CB750C Carbs idling at 3500??? > > Worked on it more this afternoon. The trick with the sync screws did not > help. Now the choke does nothing. I never touched air/fuel screws or idle > jet. Now you need some throttle to start it and hold it for a while, then > it idles again at about 2000+. Cylinder 2 is NOT getting hot still. I will > pull the carbs again and try to sync the butterflies. I found an excellent > article that discusses rebuilding these specific carbs. > > On Tue, Feb 28, 2012 at 7:55 PM, Allen Thomas <[email protected]>wrote: > >> ** >> Has it ever run right to your knowledge. Did you do anything else done >> besides cleaning the carbs? Did you count the turns on the fuel screws >> before removing them? Will it start without the choke? >> Sent via BlackBerry by AT&T >> ------------------------------ >> *From: *Ralf Oehlerich <[email protected]> >> *Sender: *[email protected] >> *Date: *Tue, 28 Feb 2012 03:17:39 -0500 >> *To: *<[email protected]> >> *ReplyTo: *[email protected] >> *Subject: *[Nighthawk Lovers] 81 CB750C Carbs idling at 3500??? >> >> Working on a 81 CB750 custom and just cleaned the jets on the carbs. Put >> everything back on the bike and she idles at 3500 rpm. Could that be a bad >> fit/too much air? >> Cables are free and idle screw is all the way out. Air box and filter are >> in place. Plugs are NOT new. She runs fine, just WAY too high even with >> choke off when cold. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Nighthawk Motorcycle Lovers!" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> 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 [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> 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 [email protected]. > To unsubscribe from this group, send email to > [email protected]. > 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 [email protected]. > To unsubscribe from this group, send email to > [email protected]. > 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 [email protected]. > To unsubscribe from this group, send email to > [email protected]. > 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 [email protected]. > To unsubscribe from this group, send email to > [email protected]. > 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 [email protected]. To unsubscribe from this group, send email to [email protected]. 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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en.
