![]() ![]() If your valves are good to go and you are still having this problem. If needed, adjust the intake valve to.05-.09mm and the exhaust valve to.Once loosened, the adjuster will screw up or down as needed. I believe you will need to use a 10mm wrench to loosen the adjuster lock on the rocker arm.Use a feeler guage to check clearance between top of valve and rocker arm. ![]() If both valves are closed, you should be at top dead center. Rotate the engine counter clockwise until the alignment marks, sometimes indicated by a "T" are aligned with the mark on the case.This will also allow you to turn the engine and align the piston with top dead center. This is the stator side and there should be no oil in this part of the engine. This is left side if you are riding the bike. Remove the valve caps (I believe these are 17mm and they are located on top and bottom of the cylinder head.) There may be a little oil come out of the lower (exhaust) cap.If you need to adjust your valves, do this with the engine cold and spark plug out. Check you compression and run a leak-down check to see what the compression portion of your engine looks like. This can cause the valves to open prematurely which causes all kinds of starting issues. One of the tendencies of these engines is the valves will actually tighten as they wear in. If you verify there is fuel getting to the cylinder and there is also spark, you need to verify compression. Unfortunately, they do not have the same quality. These engines are based on the awesome Honda design. SOURCE: i have a 110cc chinesse built atv.
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