Trail Tech (6170-35 35 oz. Flywheel For: Honda CRF450R 09-12: Adds 17 ounce Trail Tech flywheels are CNC machined from hardened chromoly steel and individually balanced Heavier weight flywheels reduce stalling, improve traction, reduce the need for clutching, and make the bike easier to start The machine will hook up better in soft terrain, smooth power delivery, pull stronger, reduce arm pump and fatigue, without affecting top speed Note: For use with stock or Trail Tech stator