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Gaskets and Seals› Engine Gaskets and Seals

Wiseco

Wiseco, Top End Gasket Kit, Yamaha YZ / WR450F / YFZ450, 97.00 mm Bore

$117.95 $115.48 Save $2.47

SKU: W00C W6421

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Special Order
Ships in 4–6 weeks
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The Wiseco W6421 is a top-end gasket kit designed for Yamaha YZ/WR450F/YFZ450 models with a 97mm bore. Wiseco offers various gasket kits, including top-end and bottom-end options, for numerous powersports applications. These kits provide OEM+ quality for reliable rebuilds.

The kit includes all specified gaskets and seals under a single part number and is manufactured by leading suppliers. Each kit is inspected for quality and accuracy.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandWiseco
Part NumberW00C W6421

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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