260cc Stumbles By arckitel (Read 340 times)

[arckitel]

Hey guys, My 260cc Linhai stumbles at about half throttle in neutral as well as in gear. I've adjusted the air/fuel out to 2 1/2 turns and played with it, but it doesnt seem to actually do anything unless I turn it nearly a whole turn either direction. Any idea how to fix the stumbling problem?

[arckitel]

Oh, and i forgot to mention, every time I go to start it, it acts like the fuel has run away from the carb. Doesnt matter how long it has ran. 5 minutes or an hour, it always acts like the fuel has drained out of the carb. Not sure if that helps. Thanks again.

[trailheadmike]

If you think you've properly adjusted the carb, you might want to check the diaphragm in the carb. A torn diaphragm will cause all sorts of problems including the types you've mentioned. Check out some of these threads:

scootdawg.proboards.com/thread/35468/carburetor-diaphragm-blown

And here's one with a pic:

scootdawg.proboards.com/thread/53066

And here's a quick fix suggestion

scootdawg.proboards.com/thread/53159/small-hole-diaphragm-problem-cheap