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.