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I think some discussions have been had on other threads about pistons, and not running stock pistons. Vince, in the UK talks about running a KX100 piston at 52.5mm with a re-bore and lining. Then later about a Wiseco 50mm to 52mm from an RM100. Anyone care to chime in on piston recommendations? I've also been looking at Vince's post about using a Yamaha RD200 head to get the advantage of a squish band. But I'm not sure the legality in AHRMA or USCRA. Any thoughts?