Yamaha YFZ 500cc Complete Big Bore Kit (100mm Bore)

This is a complete kit including everything needed to bolt on a 500cc big bore kit for YFZ450 (carb models) from 2004-2013.
Complete bolt on kit includes a 100mm cylinder, 100mm Piston kit, and Cometic gaskets.
 
Custom designed 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