how do i adjust the carburator screw? By gnoik (Read 572 times)

[gnoik]

How do i adjust the screw on the carburator on a Jonway yy250t?
the screw is placed horisontal under the carburator, so it is very hard to adjust while idling, any tips? I have a CO-tester, but i dont know what the CO should be. I guess 3-5% but i am not sure. Are there any other way to adjust?

[widehide]

gnoik, I use this tool, it captures the screw head and works fine, Warm the engine, set your idle slightly high, turn the screw in CW slowly, rpm will drop. Then turn it CCW and rpm will start to rise, do this very slowly, when the rpm does not rise any more stop, This method has always worked for me. Do everything very slow so the engine has time to respond. Look here to buy it, Good luck.

powersport-superstore-inc.amazonwebstore.com/Motion-Pro-PILOT-SCREW-ADJUSTING-TOOL/M/B000WJBMQK.htm