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Message: [QUOTE="ukracer, post: 740435, member: 48483"] just came to change piston on yz 125 03. Everything stock apart from pc pipe. When removed piston it has a very slight flat spot about 3/4mm wide at the exhaust port along length of piston Also it is a vertex piston and it has two small holes drilled into it inline with marks. These are not standard are they? I have read on here people do it for better lubrication. The cylinder looks great though. What should i do. ? Should i drill holes again with new piston? if so any special way? Sorry i am asking a lot but any advice or thoughts greatly appeciated.!! Thanks [/QUOTE]