New Rider
Currently Offline
Posts: 2 
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Joined: Jun 7, 2015 17:20:41 GMT -5
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Post by bluescootgal on Jun 7, 2015 17:27:02 GMT -5
My bf has a Jinlun 50cc that has been supposedly upgraded to a 125cc. It is hard to start cold, but once he gets it started it is great. Stops for a while, fires right up while warm. He has been told the exhaust valve is tightening up while riding, so he has adjusted the valves numerous times. This seems to fix the problem for about 30 miles or so, and then it starts doing it again. Any suggestions?
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Post by rcq92130 on Jun 7, 2015 20:22:06 GMT -5
New bf?
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Post by rcq92130 on Jun 7, 2015 20:27:52 GMT -5
Sorry - couldn't resist.
Here is a tutorial on adjusting valves. If he has done so repeatedly I doubt he is doing wrong (like not tightening the locknut), but just in case.
Other than the locknut not being tightened (which of course would let the adjustment quickly vibrate out of adjustment), I can't think of a reason why the adjustment isn't lasting at least 1,000 miles. Makes me suspect that's not the problem. Maybe it's a loose ground connection, or loose connectors on the coil, or a failing plug wire, etc.
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Post by geh3333 on Jun 7, 2015 23:42:48 GMT -5
Unless he stripped the locknut the first time he adjusted the valves.
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