Hey,
Im in the process of rebuilding the top end on my 1995 YZ125
Im unsure as what piston to order for my bike, im either going for OEM or a wiseco piston. I brought the bike second hand and the prevous owner told me that the cylinder had been resleved and I know that the cylinder head is from a 1994 model but the cylinder is a 1995. I know the oem pstons come colour classified and don't know which colour to order. Would the best bet be to measure the bore size and go from there? Is there a general rule like piston 10% smaller than bore or something???
Hellp greatly appreicated.