Hey there. Been a while since I posted anything, but here goes nothing.... I'm having idle problems with my '78 CB750F. Over the winter I rebuilt the carbs, and found that they were, generally, in very good shape. No clogs, very little varnish, nothing really to do but replace parts. Now, however, I can't get the poor thing to idle properly.
Everything is stock (new paper air filter, stock jets, new plugs, good points and spark, etc.), and I started with the pilot screws out 1 and 1/4 turn out. It wouldn't even start, so I gave them 1/4 turn out, tried to start, repeat. Eventually, at 2 turns out, I could get the bike to start with a couple pumps of the throttle and the choke all the way out. However, it would race to 4000rpm (or higher), causing me to keep a hand on the choke to keep the RPMs under control. The end result being, it would start, race, then die (not idle). 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. Any idea of what might be wrong before I take it to the dealer this weekend? I'm installing new tires, and if I can't get it to idle properly before then, I'm just going to pay them to fix whatever I may have messed up during the rebuild. Many thanks, Paul SOHC #234 '78 CB750F
