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The only problem I see with the new rules are the bore and stroke rule for the 636 four valve motor.That rule forces you to use a Kawasaki if you want to get out to 636cc. Kawasaki is the only one that builds a 636. Honda Yamaha and Suzuki are all 600. Every piston company like J&E wiseco and CP make 636 kits for the 600 Why would you make a rule like that it cuts down your options just make the 4 valve motors 636.and be dun with it. forget the bore and stroke.
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