Cylinder Works 21007-K01 Big Bore Cylinder Kit – 52.50 mm – Yamaha

Boost your Yamaha's performance with the Cylinder Works 21007-K01 Big Bore Cylinder Kit. This kit includes a direct bolt-on cylinder, Vertex piston, and top-end gaskets for enhanced power and reliability. We price-match reputable online stores—contact us to ensure you get the best deal! Note: Requires cylinder head modification.

✅ What’s Included

• Big Bore Cylinder (52.50 mm)

• Vertex Piston Kit (piston, rings, pin, clips)

• Top-End Gasket Kit

🔑 Key Features

• Big bore design increases displacement to 103.5 cc (+5.00 mm overbore)

• Nickel-silicon carbide-plated cylinder for durability and long life

• Includes matching Vertex pistons for longevity and reduced engine noise

• Virtually identical appearance to OEM cylinders

• Made in the U.S.A.

• Compression ratio: 8.2:1

• Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

📦 Fitment (Highlights)

• Yamaha:

  • 2002-2018 YZ85

• Notes: Always verify fitment by year, make, model, and engine specifications before ordering. Replaces OEM part numbers: 5PA113110000, 5PA113110100, 5PA113111000. Requires cylinder head modification.

💲 Price & SKU

• Retail Price: $885.95

• SKU: 0931-0346 / 21007-K01

• Note: We price-match reputable online stores—contact us for the best price!

• Weight: 3.6 lbs

• Dimensions: 6.42" (H) × 10.94" (L) × 8.57" (W)

• Availability: In stock. Ships next business day

🛡️ Warranty

• Contact Cylinder Works for warranty details (proof of purchase required)