YFZ450r 2009- Present 100mm Cylinder

Our 100mm big bore cylinders feature many innovative designs to create the most reliable and strongest cylinder on the market!

• 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 stroke cranks  

• Bolts on with no case modification  

• Better ring seal and less blow by results in 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  

These cylinders work perfectly with our +5mm crank to create a 540cc engine!