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Message: [QUOTE="spanky250, post: 158932, member: 20897"] No amount of flywheel lightening is going to help you keep up with a KX 500 or a KTM 520 in any condition that allows them to get into the meat of the power. That said, the KDX engine is based on an older KX 125 design, so it may be possible to fit a KX 125 flywheel from this older generation, although I don't know what year 125 engine you would need the part from. You will lose the lights in this process, and you will also give up some of the lugability and tractibility that makes the KDX so friendly. [/QUOTE]