Shanghai 150cc ATV, DENI PZ27 carb
It starts well, idles nicely initially, after warm it idles very fast, gas leaks from some sort of over flow tube, if it stalls--it doesn't want to restart, let it sit over night and it starts fine. I have carburetor apart---it is very clean inside. Any suggestions?

 

Dip floats in warm water to check for air bubbles if you get bubbles replace float. Replace needle and seat or just the needle valve. Needle some times looks o.k but still leak. I still have a bald spot from the same problem.

 

We got it fixed, pulled the float bowl, found dirt around rubber seat preventing closure of the valve.
Idle is still very eratic---starts off normal, then engine starts to race as it warms up. Have to manually keep adjusting the idle speed.
Thanks for the comeback and information.
fritzal

 

Check your jets. Carb could have internal leak. Check the choke circuit. Some times gas leaks around the "O" rings or seat somewhat like your needle valve only on the choke plunger.

 

Thanks