ProX Intake Valve I YZ400F 98-99 + WR400F98-00 + YZ426F00 Next to the Titanium valves ProX also offers a complete line of steel valves.The ProX steel valves are manufactured of premium grade steel to...

ProX Clutch Basket Yamaha YZ400F 98-99 + WR400F 98-00 ProX Clutch Baskets are precision machined from heat treated aircraft type aluminum alloy to O.E. precision standards. Sophisticated...

ProX Throttle Cable WR400F 98-99 + YZ400F 98-99 Clutch and Throttle Cables: A complete new program has been added to the already wide program of ProX Racing Parts products.

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...

ProX Piston Kit YZ400F 98-99/WR400F 98-00 12.5:1 (91.96mm) ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used...

ProX Camchain YZ/WR400F 98-00 + YZ/WR426F 00-02 ProX is offering a wide range of Camchains for the MX, ATV and road bike market. For the supply of the camchains ProX has a successful cooperation with...