Cylinder Works 21005-K01 Big Bore Kit – 99 mm – Yamaha YZ450F
Cylinder Works 21005-K01 Big Bore Cylinder Kit – 99.00 mm – Yamaha
Maximize your Yamaha's power with the Cylinder Works 21005-K01 Big Bore Cylinder Kit. This bolt-on kit includes a cylinder, Vertex piston, and top-end gaskets for enhanced performance. We price-match reputable online stores—contact us to ensure you get the best deal!
✅ What’s Included
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Big Bore Cylinder (99.00 mm)
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Vertex Piston Kit (piston, rings, pin, clips)
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Top-End Gasket Kit
🔑 Key Features
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Big bore design increases displacement to 470 cc (+2.00 mm overbore)
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Nickel-silicon carbide-plated cylinder for durability and long life
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Includes matched Vertex pistons for longevity and reduced engine noise
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Virtually identical to OEM cylinders
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Made in the U.S.A.
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Compression ratio: 12.5:1
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No machine work required
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Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
📦 Fitment (Highlights)
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Yamaha:
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2010-2013 YZ450F
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Notes: Always verify fitment by year, make, model, and engine specifications before ordering. Replaces OEM part number: 33D113110000.
💲 Price & SKU
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Retail Price: $834.95
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SKU: 0931-0354 / 21005-K01
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Note: We price-match reputable online stores—contact us for the best price!
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Weight: 4.45 lbs
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Dimensions: 6.85" (H) × 11.29" (L) × 8.46" (W)
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Availability: In stock. Ships next business day
🛡️ Warranty
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Contact Cylinder Works for warranty details (proof of purchase required)
📦 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.
