no matter what i do i cant seem to get my bike running again. i had it started at first, but the chain kept breaking. after i fixed that problem i may have put too much oil in it. i have since tried all the tricks i can find, carb cleaner, gas in the hole. Nothing! im not sure why but i dont think the engine is getting gas. the first time i ran it and then took out the spark plug, it was dirty. now it has stayed clean. i dont know if the carb is screwed or what . please help.