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ProX Piston Kit KX250 92-04 (66.37mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits...

ProX Piston Kit KX85 01-13 (48.47mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits are...

ProX Piston Kit KX85 01-13 (48.45mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits are...

ProX Piston Kit KX65 00-23 + RM65 03-05 (44.48mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX...

ProX Piston Kit DR-Z400 00-22/LT-Z400 03-18 12.2:1 (89.97mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine...

ProX Piston Kit RM-Z450 13-23 12.5:1 (95.96mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX...

ProX High Compression Piston Kit RM-Z450 05-07 13.0:1 (95.48mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine...

ProX High Compression Piston Kit LT-R450 06-11 13.0:1 (95.47mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine...

ProX High Compression Piston Kit LT-R450 06-11 13.0:1 (95.46mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine...

ProX Piston Kit RM125 00-03 (53.96mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits...

ProX Piston Kit RM125 00-03 (53.94mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits...

ProX Piston Kit RM125 89 (54.00mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits are a...

ProX Piston Kit RM80 91-01 (82cc) (48.50mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston...

ProX Piston Kit TS50ER/X + FZ/JR/LT50 -46103- (41.50mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers...

ProX Piston Kit GP1300R 03-08 (83.92mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits...

ProX Piston Kit GP1300R 03-08 (83.91mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits...

ProX Piston Kit GP1300R 03-08 (83.90mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits...

ProX Piston Kit GP760 + SUV/GP1200 Art (83.91mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX...

ProX Piston Kit SJ700 94-17/Wave Runnr 1100 Art (82.50mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers...

ProX Piston Kit SJ700 94-17/Wave Runnr 1100 Art (82.00mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers...

ProX Piston Kit YZ450F 20-22 + WR450F 21-23 13.0:1 (96.97mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine...

ProX Piston Kit YZ450F 20-22 + WR450F 21-23 13.0:1 (96.95mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine...

ProX Piston Kit YZ450F 14-17/WR450F 16-18 12.5:1 (96.95mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers...

ProX High Compression Piston Kit YZ450F 10-13 13.5:1 (96.95mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine...

ProX Piston Kit YZ450F 10-13 12.5:1 (96.97mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston...

ProX Piston Kit Yamaha YZ250F 19-23 13.8:1 (76.97mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX...

ProX Piston Kit YFZ450 04-13/YFZ450R 09-20 12.0:1 (94.96mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine...

ProX Piston Kit YZ400F 98-99/WR400F 98-00 12.5:1 (91.95mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers...

ProX Piston Kit YZ250F 16-18 /250FX 17-18 13.5:1 (76.97mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers...

ProX Piston Kit YZ250F 16-18 /250FX 17-18 13.5:1 (76.95mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers...