I cleaned up px 210 malossi Barrel with. Patio acid fine gaining paste 1200 wet n dry bought piston by correct letter from malossi center Italy bolt on Barrel but I had bad noise which never had before I thought it was the head ect so after taking off God how many times I cleaned edge of head by a mm everything still a noice so I nearly gave up I thought piston ring was tight I thought that's the way it is. But the piston ring was upside I contacted the malossi and complained they sent me this link I cleaned out ring slot with wet n dry wiped a little I must flip the piston ring the right way problem solved I didn't bother matching casings or changing crank timing as top port is already matched side ports are increased by the piston design work a treat 125 main jet .I had to google problem malossi and it bought me to forem so I post this topic so don't catch everyone that hasn't seen a semi transcopal piston ring it's on page 31 of download on this link. https://wemalossistore.blob.core.windows.net/files/montaggio/pdm/7317163.pdf
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