49cc 2 stroke syx moto big bore kit new spark plug.

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testing my sons syx moto 50cc upgraded engine and sparkplug.
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My clutch nut wasn't tight on this run.smh when I assembled engine with big bore kit and new clutch I forgot to go back and tighten everything. Eventually I discovered the head bolt came loose. I discovered it a while later. I tighten everything now it's running good

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