Tokyomods 30-001 Less Tension Throttle Spring 4 STROKE APPLICATIONS: ALL KEIHIN FCR CARBURETORS Honda CRF150R, CRF250R/X, CRF450R/X; Suzuki RMZ250, RMZ450; Kawasaki KX250F, KX450F; Yamaha YZ250F, 450F; KTM 250/450/505/530 Does not fit TRX450