Mini Dirt Bikes & Pit Bikes Forum

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    Engine Jerking At High Speed

    Hi.I have a dirt bike with loncin engine and it just worked fine for 1 year with no big problems...but my old spark plug broked so i bought new(not the same cause i couldnt get it) and now engine jerking at the high speed before was 95km/h now its around 50km/h...write any solution...