80's can normally only be bored out to a 105cc's. If you have spark is the plug getting fuel??? Have you done a compression test? Will the bike push start? If it's backfiring it could be an air leak or jetting.
Clean the carb out blowing out all passages, new plug, clean air filter.
like you said i dont think that i am getting good compression do you know what kind of compression i should run
if i put it in gear and push it will smoke out of the pipe and every once and a while it will back fire
I'll guess the plug. I have seen quite afew get spark when dry starting it but not hot enough when compressed on. For $2 at any auto parts store, try a NGK br8es. Make sure the spark is a strong blue with a nice snap when it fires.
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