I have measured the inside of the cylinders with a piston ring and then measured the gap in the opening of the ring. Thought that the bore in the top cylinder was smaller than the other, but they were, as far as I could se the same (~0,55 mm). Will have a look at the height then! Will also have a look at my older pistons to see how they look, to bad I didn't mark them so I would know if the were mounted top or low.

My power jets are not plugged. Have been testing bigger main jets and with spark plug readings have come to the conclusion that 165 is OK, maybe a little rich.
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MC21, GP-Replica (Daijiro Kato, Telefonica Movistar Team 2001)