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i've got a 49cc mini dirt bike it starts some time but with a lot of smoke?

I've got a 49cc mini dirt bike it starts some times but with a lot of smoke comeing out of the exaustand some poping , Why does it not start? pls help me!!!!!

andy davis, November 2008

home Fix label Vehicles label_important Motorcyclesdone

49cc mini dirt bike are only supposed to have 30mills or 2stroke to 1000 mils or petrol no more no less clean the spark plug with a wire brush then check the spark if no spark or is weak make sure the cdi is in its place n all bolts r tight and cut off switch is working correct

david g mcbikers, November 2008

2 stroke motors are hard on spark plugs, I suggest buy new plug, use good quality 2 stroke oil and do not use more than you are supposed to, check the exhaust for plugging up with carbon.

joseppie, November 2008

put in some 2 stroke quality oil

harry, November 2008

hi thanks for the tip why dosen't it start up when i pull it and the smoke only comes out with the each pull??

andy davis, November 2008

2 much 2stroke smoke bluish/grey

steray, November 2008