Yamaha

2 | Select A Year

WR450F

4 | Select A Sub Model

Prox Engines & Parts for Yamaha WR450F

ProX 9.48MM Complete Valve Shim Kit

ProX 9.48MM Complete Valve Shim Kit

$113.25 $113.83

New Part

Prox Forged Flat Piston Kit 12.5:1 96.97 mm

Prox Forged Flat Piston Kit 12.5:1 96.97 mm

$177.71 $195.48

New Part

Prox Forged Flat Top Piston Kit 12.5:1 94.96 mm

Prox Forged Flat Top Piston Kit 12.5:1 94.96 mm

$180.52 $207.66

New Part

Prox Forged Flat Piston Kit 12.5:1 94.95 mm

Prox Forged Flat Piston Kit 12.5:1 94.95 mm

$180.52 $207.66

New Part

Prox Forged Flat Piston Kit 12.8:1 96.95 mm

Prox Forged Flat Piston Kit 12.8:1 96.95 mm

$191.21 $210.33

New Part

Prox Forged Flat Top Piston Kit 13.0:1 95.95 mm

Prox Forged Flat Top Piston Kit 13.0:1 95.95 mm

$194.36 $213.80

New Part

Prox Forged Flat Piston Kit 96.96 mm

Prox Forged Flat Piston Kit 96.96 mm

$177.71 $195.48

New Part

Prox Forged Flat Top Piston Kit 12.5:1 96.95 mm

Prox Forged Flat Top Piston Kit 12.5:1 96.95 mm

$180.52 $207.66

New Part

Prox Cast Flat Top Piston Kit 12.5:1 94.97 mm

Prox Cast Flat Top Piston Kit 12.5:1 94.97 mm

$180.52 $207.66

New Part

ProX Cam Shaft Timing Chain

ProX Cam Shaft Timing Chain

$97.09 $99.20

New Part

ProX Crankshaft Bearing Kit

ProX Crankshaft Bearing Kit

$91.07 $100.18

New Part

ProX Complete Gasket Set for Yamaha YZ WR 450F

ProX Complete Gasket Set for Yamaha YZ WR 450F

$187.34 $206.07

New Part

ProX Steel Exhaust Valve and Spring Kit for Yamaha WR YFZ YZ450 F R

ProX Steel Exhaust Valve and Spring Kit for Yamaha WR YFZ YZ450 F R

$140.66 $146.34

New Part

ProX Steel Intake Valve and Spring Kit for Yamaha WR YFZ YZ450 F R

ProX Steel Intake Valve and Spring Kit for Yamaha WR YFZ YZ450 F R

$192.09 $211.30

New Part

ProX Forged Steel Connecting Rod Crankshaft Rebuild Kit

ProX Forged Steel Connecting Rod Crankshaft Rebuild Kit

$164.18 $180.60

New Part

ProX Forged Steel Connecting Rod Crankshaft Rebuild Kit

ProX Forged Steel Connecting Rod Crankshaft Rebuild Kit

$164.18 $180.60

New Part

ProX Forged Steel Connecting Rod Crankshaft Rebuild Kit for WR450F Ec450

ProX Forged Steel Connecting Rod Crankshaft Rebuild Kit for WR450F Ec450

$161.98 $178.18

New Part

ProX Forged Steel Connecting Rod Crankshaft Rebuild Kit

ProX Forged Steel Connecting Rod Crankshaft Rebuild Kit

$164.18 $180.60

New Part

ProX Forged Steel Connecting Rod Crankshaft Rebuild Kit for YZ450F

ProX Forged Steel Connecting Rod Crankshaft Rebuild Kit for YZ450F

$174.38 $191.82

New Part

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