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At PTR we specialise in Hayabusa development for Drag Racing, Speedway Cars, Hill climb Cars a Circuit Race Cars. We have available Big Bore Kits with the best in Forged Piston Kits and Reboring and Cylinder plating that is renowned as the best in the world. We also have welded up Stroker cranks as well as fully CNC Machined Billet Cranks for the serious racer. We have a specialised Cylinder Head service including standard port and flow jobs to completely changed exh ports and welded up and changed inlet ports with standard or oversize valves.