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run straight piping all the from the intake manifold to the rear of the car. it will sound more loike a muscle car, its realy loud, you will get attention!!!

I have a Sunl 70cc dirt bike that needs a new piston and need torque specs of the engine. It would be awesome if you can give me all of the specs but what ever you have would also be great.

I have a 70cc dirt bike that is very hard to turn on when the motor is cold but when it finally turns on it runs great. Sometimes i put it in the sun and it turns on in a couple of kicks (3-5). I was wondering if any body could tell me what is wrong with it or if i need to replace anything...