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I was thinking of doing the same thing to my DB30. Did you have to do anyhting special to fit the engine? My engine which is the 6.5 hp jiang something (blue one) is pretty wide and for the crank shaft to line up with the sprocket, it has to almost hang off of the engine plate.

Hi, I'm building a mini bike with 14 in. tires. I have a 6.5 hp engine and I am going to use a centrifigal clutch. What is the best gear ratio? 60 tooth and 12 tooth?