I agree with most all of what Phill said. And, I believe he is on the right track for a possible solution. However, the 77 and 78 CB 750's do have an accellerator pump on the carbs. Pumping them ought to make things richer.
So, Paul, did you balance the carbs, or put the slidse in backwards? You could check your own work or pay someone else to do it for you. Your choice, of course. Cheers, Lloyd SOHC4 #11 [EMAIL PROTECTED] wrote: >>The only way I can get it to idle is to go through this pump-throttle, >> >> >choke out, start, control racing RPMs, die, repeat, until the engine gets >warm enough where it will idle somewhere around around 1000-1200rpms. > >Just to get things straight - "pumping the throttle" has no effect on the >old Keihin carb. They do not have a acceleration pump in them. >Running to 4k rpm with the throttle shut points to a large air leak. Look >for reversed slides (the cut-away goes to the air filter side!), vacuum >gage plug screw missing, slides not seating, *very* loose or cracked >manifolds, slide actuators not in the fork, poor adjustment of the slide >height adjustment (bad carb balance), etc. > >It has to be sucking far too much air. 4k is about half throttle on one >slide/cyl, if the others are shut! > >Wrenchers (no offence intended!) are sometimes over zealous screwing in >the main jets, and crack/break the main jet post(!), but that won't >increase the idle speed. It's gotta be air getting through *somewhere*, >but check anyway. > >Regards, >Phill > > >
