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I have a mini chopper with a 50cc engine “1P39FMB” stamped on the block. It is a 4 stroke with a 4 speed semi-automatic transmission. I’ve tried to find one and the closest I could find would be for a 1p39qmb. I don’t know the differences, or even if there is one, but it would be nice to have a little more power on my mini chopper.
 

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As far as I know the numbers don't mean anything, but assuming it's a Honda clone a standard 70cc top end will bolt right on.

Don't be surprised if it's already a 70 tho! I have a cylinder with 49cm3 cast into it that was actually a 70. When it got wore out I thought I was gonna get an upgrade to 70cc's but it already had the larger piston. 49mm rings a bell ...
 
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