Tokyomods 3901 Accelerator Pump Spring 4 STROKE APPLICATIONS: ALL KEIHIN FCR CARBURETORS Honda CRF150R, CRF250R/x 04-06, CRF450R/X 02-06; Suzuki RMZ250, RMZ450; Kawasaki KX250F, KX450F; Yamaha YZ250F, 450F; KTM 250/450/505/530