Trail Tech (6141-29 29 oz. Flywheel For: Honda CRF450R 02-03: Adds 7 ounce, CRF450R 04-08: Adds 11 ounce, CRF250R 04-09: Adds 13 ounce, CRF250X 04-09: Adds 9 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 Trail Tech stators