Name: Cylinder Works Big Bore Cylinder Kit 80mm 270cc - Yamaha YZ250F / YZ250FX / WR250F (2019-2024)
Brand: Parts Unlimited
SKU: 0931-1021
Price: 1061.00 CAD
Availability: InStock

Cylinder Works Big Bore Cylinder Kit 80mm 270cc - Yamaha YZ250F / YZ250FX / WR250F (2019 - 2024) - Dune Goons

$1,061.00

Shipping calculated at checkout.

Cylinder Works Big Bore Cylinder Kit 80mm - Yamaha YZ250F / YZ250FX / WR250F

Take your Yamaha 250F from 250cc to 270cc with this complete big bore cylinder kit. The +3mm overbore delivers noticeable power gains throughout the RPM range. Includes Vertex matched piston, Nikasil plated cylinder, and full gasket kit. Direct bolt-on with no machine work required. Made in the USA.

What's Included

Cylinder Works 80mm big bore cylinder
Vertex matched piston
Piston rings
Wrist pin and clips
Complete top end gasket kit

Key Features

Big bore design increases displacement from 250cc to 270cc. Nikasil plated cylinder for long life and excellent heat transfer. Vertex piston ensures longevity and reduced engine noise. Looks virtually identical to OEM. Direct bolt-on installation with no machine work required.

Specifications

Bore Size: 80mm (+3mm overbore)
Displacement: 270cc
Compression Ratio: 13.8:1
Engine Type: 4-Stroke
Material: Cast Aluminum with Nikasil plating
Weight: 3.51 lbs

Fitment

Yamaha YZ250F: 2019-2024

Yamaha YZ250FX: 2020-2024

Yamaha WR250F: 2020-2024

Why Cylinder Works?

Cylinder Works is a trusted name in powersports engine components. Their cylinders and kits are manufactured in the USA to strict tolerances. Used by professional racers and weekend riders who demand reliability.

📦 Shipping Information

In-Stock Items:
- Most parts ship next business day
- Modquad parts: Monday–Thursday dispatch

Made-to-Order Items:
- Custom swingarms & A-arms: 2–4 weeks
- EVP exhaust systems: 2–4 weeks
- Sneakers: 1–2 weeks

Stock Guarantee: Items marked "In Stock" ship immediately. Made-to-order items are built fresh for you.

Questions? Contact us—we respond within 24 hours.