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HELP! Runs Great until warmed up

O

odl777

Forum Mentor
Hello All!

I have 1978 KZ650b with GPZ Cams, New Intake Boots, pingle fuel valve, New Gas Cap, rebuilt head/Bore, Dyna S, 4 into1, K&N Pods, Sparx Battery Eliminator (Reg/Capicitor).

Issue:
Bike starts easy (Kick only)....has strong power but I suspect still some jetting issues with the needle. Any who I ride the bike for about 10-15 minute...ton of power idles good no issues. The bike warms up and then it wont idle unless I stay on throttle. Bike will start up immediate no issues.... but in order to start I have to use throttle.

Could this be my float adjustment? Or possible carb sync issue? I benched sync the carbs to get close and then used a vacuum gauge from a VW (Snail style) to tune.....it was pulling roughly 3psi or 3kg/h .

Guage:
http://www.cbperformance.com/ProductDetails.asp?ProductCode=6537


Thank you!

Mark
 
Methinks you might have clicked on the wrong bookmark. :-k

This is the Suzuki GS site, not the Kawasaki KZ Riders site. :-\\\

.
 
Set the idle after warm right?

Set the idle after warm right?

Your choke circuit is in play when cold.
Try setting your idle speed adjustment screw faster once its hot.
 
I thought a 4cyclinder was a 4cyclinder? I own 2 GS's so Im not too fond of the KZ Forums.



Thank you Rebuild guy....I have tried that but the bike idels to high...it works just not the fix.

I may try to adjust my sync settings where the slide is higher.

Thank you!
 
Vacuum sync then go from there. It's almost impossible to diagnose running problems on a bike that hasn't been properly maintained.
 
Thank you! The carbs are sync'd and the problem continues!!! I also have a ton of white smoke coming from the engine vent near the back of the motor.

Thank you!
 
If it runs good cold and bad when warm I would suspect your mixture is rich. Do you have to use no choke or very little choke to start it? If so, your mix is acting as your starting level, which is too rich when the motor is warm.
 
White smoke? White smoke would indicate water(?) in the system, black is too rich and blue is oil.
 
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