Athena Big Bore Race Cylinder Kit – Kawasaki KX65 (2002–2025)
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Athena Big Bore Race Cylinder Kit – Kawasaki KX65 (2002–2025) (P400250100007 / 0931-0107)
Description
Upgrade your Kawasaki KX65 (2002–2025) to true race performance with the Athena 80cc Big Bore Race Cylinder Kit (P400250100007). Designed for riders looking for more power, torque, and throttle response, this kit transforms your 65cc mini into a championship-level machine.
Crafted from lightweight aluminum with a nickel-carbide coated bore, this cylinder kit delivers increased displacement, improved durability, and precise heat transfer for maximum reliability under race conditions. Athena’s high-performance cylinder head and power valves are engineered for top-end gains and midrange torque — perfect for serious racers and tuners.
What’s Included
✅ 50.00 mm aluminum cylinder (nickel-carbide coating)
✅ Aluminum cylinder head with removable bronze dome
✅ High-performance anodized power valves (not compatible with OEM valves)
✅ Athena top-end gasket kit with seals and hardware
✅ Cast lite flat-top piston kit (piston, rings, clips, and pin)
Fitment
📦 Fits:
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2002–2025 Kawasaki KX65
Key Features
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Increases displacement from 65cc to approximately 80cc
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Nickel-carbide bore coating for reduced friction and long life
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Race-engineered power valve system (not OEM compatible)
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Includes all necessary gaskets, seals, and piston kit
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Precision-machined aluminum head with bronze dome for optimal combustion
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Designed for racing and high-performance builds
Warranty Info
Manufactured by Athena S.p.A. (Italy).
Warranty and tech support provided directly through Athena.
📦 Shipping Information
In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.
Made-to-order and custom powder coat items show their lead time at the top of this page, right next to the truck icon. These are built fresh for you, so timing varies by brand and current backlog.
Need something by a specific date? Call us at 541-668-7503 before ordering and we will check stock and ETA on that exact part. We can often point you to an in-stock alternative from another distributor.
Questions? Contact us, we respond within 24 hours.
