Pro Circuit Clutch springs Yamaha YZ250F 19 23 Seats KTM YEAR 85 SX 18 20 Sizes one size fits KTM YEAR 85 SX 18 20 125 XC W 17 20 125 SX 16 20 150 SX 16 20 150 XC W 17 20 250 EXC TPI 17 20 250 SX 17 20 250 SX F 16 20 300 EXC TPI 17 20 350 EXC F 17 20 350 SX F 16 20 450 EXC F 17 20 450 SX F 16 20 500 EXC F 19 20 HUSQVARNA TC 85 18 20 TC 125 16 20 TE 125 17 20 FC 250 16 20 FE 250 17 20 TC 250 17 20 TE 250 i 17 20 TE 300 i 17 20 FC 350 16 20 FE 350 17 20 FC 450 16 20 FE 450 17 20 FE 501 17 20 6mm (Black) Honda CR125 250 97 07 CRF250 450 02 15 Kawasaki Pre 08 which is crucial in controlling how efficiently the clutch turns power into acceleration These high performance springs will help to keep engine temperature down