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Discussion Starter #1
Bore piston to 50 over and now it runs great for the first 5-10 minutes but then starts backfiring alot to were u can barely move. any suggestions? plzz
 

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Discussion Starter #5
um im not rele sure to be exact but it seems like its either sucking in air or like its struggling to get gass i was thinking head gasket not torrqued rite or maybe the jets any suggestions?
 

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yeah i wonder if the carb is loading up with fuel and then it all is igniting. if you havent already, you might try jumping up a main jet size to see if it helps with the overbore
 
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