Login  Register

79 CB 750K tuning issue(Possible Accel pump issue?)

Posted by lakeguy556 on Sep 09, 2012; 10:25pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/79-CB-750K-tuning-issue-Possible-Accel-pump-issue-tp4028920.html

Hey all,

Long story short, I'm working on rebuilding the above mentioned bike. 7K original miles on the odo.

Got my carbs rebuilt last night. Bench sync'ed them and threw them back on this am. A/F mix screw is set at 2 turns out.

Bike fired up and ran sewing machine smooth. Let it run for a while the whacked the WOT. Once it got to around 5-6kK the bike began to stutter and wouldnt climb any higher. Rolled slightly off the throttle and she began to climb to around 6K but wont go any higher.

After doing some research I fear I may have neglected to properly clean/check the accelerator pump while I had the carbs apart. I did check the diaphragm with a back light at the time and it looked ok. tube was straight and not bent. It did have a bit of corrosion/rust/varnish on it which I cleaned up with 000 steel wool. I put it all back together but was not aware of the ball/spring/plug issue at the time.

Could this be my problem, that I need to pull the carb bank back off and remove the brass/nylon plug in the accel pump and check for proper operation.

Im running the stock airbox with new AF and spark plugs. Valve are in spec.

Appreciate any input