Big Bore 900 Kit for Patriot 850 // SKU: 09-311

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$3,700.00 USD
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Big Bore Kit – Outright Purchase

No core exchange or wait time required. This package is sold as a 100% outright purchase, meaning you receive a brand-new, complete kit to keep—no need to send in your original parts or pay a separate core deposit.

What’s Included:

  • Complete Big Bore Cylinder Assembly

  • Performance Piston Kit (Piston, Rings, Wrist Pin, & Circlips)

  • Exhaust Valve Assembly 

  • Base Gasket and Y-pipe gasket 

  • Billet Head with your choice of domes for fuel 
  • Ceramic Y pipe 

Key Features:

  • No Core Returned: Keep your stock setup for back-to-original flexibility.

  • Direct Bolt-On: Engineered to drop into place with standard shop tools.

  • Ready to Ship: No delays waiting for machining or core processing.