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I need to replace my bottom end and need to know if the motors from bekits are 8mm or 6mm. I keep seeing this when looking for bottom ends. How do you tell the difference?

So my engine (66cc Skyhawk GT5) has been running HORRIBLY, and I decided to open up the motor... The clutch cover had a ground down ring inside where the three pins sticking out of the bigger gear are... The whole assembly inside the case was pushed over about 2mm!!!!! The screw on the smaller...