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.
