Trail Tech (6141L-21) 21 oz. Lighting Flywheel For: Honda CRF450R 02-03: Subtracts 1 ounce, CRF450R 04-08: Adds 3 ounce, CRF250R 04-09: Adds 5 ounce, CRF250X 04-09: Adds 1 ounce Trail Tech flywheels are CNC machined from hardened chromoly steel and individually balanced Adding weight will reduce stalling, improve traction, reduce the need for clutching, and make the bike easier to start Sand, dune and MX riders will generally choose a light weight flywheel Note: For use with Trail Tech stators