Cylinder Works 19-20 Yamaha WR 450 F 450cc +2mm Big Bore Cylinder Kit 470cc 12.8:1 Comp. 99mm

Name: Cylinder Works 19-20 Yamaha WR 450 F 450cc +2mm Big Bore Cylinder Kit 470cc 12.8:1 Comp. 99mm
Brand: Cylinder Works
SKU: C0BU CW21012K01
Price: 942.35 USD
Availability: InStock

$991.95 $942.35 Save $49.60

SKU: C0BU CW21012K01

Special Order

Ships in 4–6 weeks

Free Shipping

Non-Returnable Item

DIY PRO SHOP

Moderate — 2–4 hours

Description

This cost-effective, ready-to-install, direct bolt-on cylinder kit from Cylinder Works requires no re-plating. It includes a matched Vertex piston for durability and optimized performance, along with all necessary gaskets, cylinder, piston, rings, pin, and clips. Made in the U.S.A., no machine work is required for installation.

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

Brand	Cylinder Works
Part Number	C0BU CW21012K01

Videos

Cylinder Works Big Bore Cylinder Kit

Cylinder Works-Big Bore Kit

Slavens YZ 300X Engine Build Part 1

YZ 300X Engine Build Part 2 - Big Bore Kit Install

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.

View Full Return Policy