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SDG USA 120cc


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TrailBikes makes two different kits, the pivotal point is whether your engine has a 13mm wrist pin or a 14mm wrist pin. You need to know that before you buy the correct kit for that particular engine. It's been so long since I've worked on an SDG engine that I forget who made them for SDG (Lifan, Jailing, etc.), maybe someone on here will be able to give you more specifics. Otherwise, you'll have to take off your top end and measure the wrist pin to see which kit will work for you.

Edited by dirtbkr188
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  • 2 weeks later...

For the first dead spot, try turning the air screw in to richen it, a 1/4-turn at a time and see if it improves. For the second dead spot, try lowering the clip on the needle to richen in the upper RPM range. Also make sure the float height is set to the specs above.

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