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Yamaha YFZ450r 100mm Big Bore Kit 500cc Cylinder, CP Piston, and Gasket Kit
This is a complete kit including everything needed to bolt on a 500cc big bore kit for YFZ450r (fuel injected model) from 2009 to present. Complete bolt on kit includes a 100mm cylinder, CP 100mm Piston kit, and Cometic gaskets. Custom designed CP piston is a light weight design, with 14:1 compression on stock stroke crank, and built in clearances for big valves, big cams, and stroker cranks. Cometic gasket kit includes head and base gaskets.
(always check all clearances during assembly to ensure proper specs due to factory variances). Proprietary cylinder machining increase gasket sealing to eliminate head gasket issues.Utilizes custom steel sleeve for maximum strength steel is much stronger than aluminum cylinder with coatings. This is the reason all major auto manufactures have aluminum blocks with steel sleeves!!!! Designed with additional piston skirt support improving piston and cylinder wear.
Built in clearance for large stroker cranks. Bolts on with no case modification. Better ring seal and less blow by equals more power. Excellent cooling characteristics for the most demanding racing situations.
Last longer and is more reliable (no coatings to flake off). Great option to fix damaged stock cylinders, and if sleeve becomes damaged a new one can be installed quickly. Retains 100% stock OEM look for a stealthy engine build. Cylinder and piston designed with clearance for stroker cranks! We have unmatched expertise and can help out to answer or solve any issues and pride ourselves in excellent customer service.