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yz125 piston size question

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I have a 2000 yz125 that i an going to do a top end on. The cylinder is maked B. If i use a Wisco piston do they make more than one size? If i go with an OEM Yamaha piston should i use a B piston? or i have also read that you should run a D size piston in all cylinders A,B,C,or D if the cylinder is not new. Some more insight on this would be helpful.

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Both my 125 and 250 cylinders are marked but that never made a differance as to which piston I put in. Just get the right one for the year of the bike along with the right bore (std or overbore).

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The difference in size between the letters is hardly measurable, that's why Wiseco only makes one size. You are correct, you should run a "D" piston if using OEM.

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