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Dirt Bike

KPMI

TOP END SERVICE KIT SS VALVE CONVERSION W/SPRINGS

SKU 80-81900·Offroad
$660.39

In stock · stock as of Sep 16, 2026

Shipping calculated at checkout

30-day returns on unused parts

Details

These pistons have been designed to incorporate a domed piston deck, resulting in a high compression profile and offsetting any change in volume caused by valve dishes. While maintaining compression through piston shape, we’ve minimized moving mass in our stainless steel valvetrain conversion by lightening our steel valves. The conversion to Black Diamond™ Stainless Steel Valves offers up to double the life over stock Titanium valves without a loss in performance.

Specs

Vehicle
Dirt Bike
Weight Lb
1.8
Shipping Class
standard

Vehicle Fitment

Check KPMI TOP END SERVICE KIT SS VALVE CONVERSION W/SPRINGS (part 80-81900) against your vehicle before ordering.

Supplier-confirmed applications for this exact part. Match the year, make, and model below. A listed application is not confirmation for an unlisted vehicle.

Yamaha WR450F

2003–2006

Yamaha YZ450F

2003–2005

Parts for the Same Vehicles

These parts share at least one listed vehicle application. Check each part’s fitment for your model and year.