Cylinder Works 66.4mm Cylinder Kit - 99-25 Yamaha YZ250
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- 30-day hassle-free returns
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✓ Fits
- 1999 to 2025 Yamaha YZ250 (2-stroke)
- Standard bore replacement - direct fit, no machine work needed
✓ Features
- Complete standard bore top end kit - cylinder, Vertex piston kit, and gaskets in one package
- Nickel silicon carbide plated cylinder for excellent wear resistance and a longer service life
- Matched to Vertex pistons for proven longevity, consistent performance, and quieter operation
- Looks just like the stock cylinder - a clean OEM-style replacement
- Replacement pistons, rings, and gasket sets available separately to extend the life of the kit
✓ What's Included
- 66.40mm standard bore Cylinder Works cylinder
- Vertex piston kit with rings, wrist pin, and circlips
- Top end gasket set
✓ Specs
- Bore: 66.40mm (standard)
- Cylinder plating: nickel silicon carbide
- Engine type: 2-stroke
- Weight: approximately 10 lb (4.5 kg)
- Manufacturer: Cylinder Works (brand #20009-K02)
- WPS part number: 422-20009K2
Ships fast from DuneGoonShop!
📦 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
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.
