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Message: [QUOTE="TexKDX, post: 120630, member: 16276"] I have been told the JB piston is the way to go. Per White Bros and Gary Hazel at Thumper, the vibration difference will be minimal and not due to the piston weight, rather due to the increased power provided with each explosion. A friend of a friend did some major mods to an XR250. He tried basically everything but stroking it. In the end, he says to stay with the stock cam and stock carb, but get the plate that allows you to change the cam timing. It made the biggest difference of all the mods besides the bore. The cam just moved things around but created too much compromise, and he never could get the carb to work well. Gary Hazel said the hot cams create reliability and durability problems thru follower wear, seat wear, and valve stretch. [/QUOTE]