POWERFLOW KIT HONDA CRF250R 18 19, CRF250RX 19 21, CRF450R 450RX 17 20 Polisport 4 mode button switch Teeth:35 4 mode button switch Bike Year Pitch Part Number 125 EXC 91 98 520 FXRS 50 48 125 EXC 99 07 520 FXRS 50 50 125 EXC 08 16 520 FXRS 50 50 125 SX 91 19 520 FXRS 50 50 125 XC W 17 19 520 FXRS 50 50 144 SX 07 08 520 FXRS 50 50 150 SX 09 19 520 FXRS 50 48 150 XC W 17 19 520 FXRS 50 50 200 EXC 11 16 520 FXRS 50 45 200 EXC MXC 00 10 520 FXRS 50 48 200 EXC MXC 98 99 520 FXRS 50 50 200 SX 03 06 520 FXRS 50 45 250 EXC 91 03 520 FXRS 50 50 250 EXC 05 19 520 FXRS 50 50 250 EXC 04 520 FXRS 50 52 250 EXC F 02 03 520 FXRS 50 48 250 EXC F 04 19 520 FXRS 50 52 250 SX 04 16 520 FXRS 50 48 250 SX 90 03 520 FXRS 50 50 250 SX 17 19 520 FXRS 50 50 250 SX F 06 16 520 FXRS 50 50 250 SX F 17 19 520 FXRS 50 51 300 EXC 05 19 520 FXRS 50 50 300 EXC 95 04 520 FXRS 50 52 300 SX 90 96 520 FXRS 50 50 350 EXC F 11 19 520 FXRS 50 52 350 SX F 11 19 520 FXRS 50 50 360 SX 96 97 520 FXRS 50 50 380 EXC 00 01 520 FXRS 50 48 380 SX 98 02 520 FXRS 50 50 400 EXC F 00 02 520 FXRS 50 48 400 LC4 E 97 99 520 FXRS 50 45 400 SX F 99 02 520 FXRS 50 50 440 SX 94 520 FXRS 50 50 450 EXC F 03 19 520 FXRS 50 52 450 SMR 05 07 520 FXRS 50 45 450 SMR 08 13 520 FXRS 50 48 450 SX F 17 19 520 FXRS 50 48 450 SX F 03 520 FXRS 50 50 450 SX F 13 16 520 FXRS 50 50 450 SX F 04 12 520 FXRS 50 52 500 EXC 12 19 520 FXRS 50 50 505 SX F 07 12 520 FXRS 50 52 520 EXC F 00 02 520 FXRS 50 48 520 SX F 98 02 520 FXRS 50 48 525 EXC F 03 12 520 FXRS 50 48 525 MXC Desert Racing 03 05 520 FXRS 50 45 525 SMR 05 520 FXRS 50 45 525 SX F 03 12 520 FXRS 50 48 530 EXC F 08 11 520 FXRS 50 50 600 LC4 90 92 520 FXRS 50 52 620 SX (LC4) 94 98 520 FXRS 50 50 625 SMC 05 07 520 FXRS 50 40 625 SXC 03 06 520 FXRS 50 40 That's why Twin Air provides a complete line of products to ensure a leak proof CRF450R 17 20