atomik 70cc valve issues

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jackbmx2010

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Joined
Jun 4, 2010
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Pacific pines
hey, I bought a atomik 70cc pit bike for 100 bucks but when I kick it over the air and fuel blows back out of the carby. The timing is set right but i cant figure out why it still does it.must be somthing with the valves but what ?? can anyone help me.
 
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