Squish Problem | Video Explanation

Get yourself another piston. some guys just have a couple kicking around and can use an old piston, but you're not going to have that luxury. So a new second piston it needs to be. Wrap the end of the piston with sandpaper and make a big fat drill bit out of it. Spin the piston in the head until the head is the same shape as the piston. Get good sandpaper, SIA comes to mind, and cut narrow bands and stretch across the piston.
 
It's made in China to non exacting standards. Option 1 do nothing and run it. Option 2. Get another piston and do like chainlube said and use it to shape the head to fit better. Or Option 3 get a better head. You probably want a bigger head anyways to get more efficient cooling, however you are most likely going to have to shape that head as well although it's a big improvement. You can also use puch 70 cc moped head but you need to drill the holes out to 8mm to fit over the studs.
 
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