525 BIG BORE KIT
$725.00
Honda 420/500/520 Big Bore Kit
Boost your Honda ATV’s power with our Big Bore Kit! Includes a forged piston, OEM cylinder (machined to fit all 2007+ cases), and a top end gasket set.
✅ Fits Rancher, Foreman, Rubicon
⚠️ 07-08 Rancher 420S requires a 09+ head
✅ Fuel tuning required
🔥 Pair with our Performance Cam for max gains!
CPP Big Bore Kit for Honda 420/500/520 Engines
Take your Honda ATV to the next level with our Big Bore Kit, designed for models using the 420, 500, and 520 engines. This kit includes a forged piston and an OEM cylinder precision-machined to fit all cases from 2007 to current models.
⚙️ Key Details:
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Fits 2007+ Rancher, Foreman, and Rubicon models
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Note: 2007-2008 Rancher 420S models will require a 2009 or newer style head
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Fuel tuning is required for proper performance and reliability
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For maximum power gains, we recommend pairing this kit with our Performance Camshaft
💥 Unlock more torque and horsepower with this high-quality upgrade, perfect for riders who demand the most from their Honda ATV.
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