Athena Big Bore Race Cylinder Kit – KTM 65 SX / 65 XC (2001–2008) (P400270100002 / 0931-0245)

Description

Take your KTM 65 SX or 65 XC to the next level of race performance with the Athena 80cc Big Bore Race Cylinder Kit (P400270100002). Designed for serious mini racers, this kit boosts power, torque, and throttle response across the entire RPM range while maintaining reliable cooling and long-term durability.

Featuring an aluminum cylinder with a nickel-carbide coating, this kit ensures superior wear resistance and heat transfer. The high-performance cylinder head with removable bronze dome and precision power valves (not OEM compatible) deliver explosive top-end power ideal for motocross, supermini, or off-road competition.

What’s Included

✅ 50.00 mm aluminum big bore cylinder (nickel-carbide coating)
✅ Aluminum cylinder head with removable bronze dome
✅ High-performance anodized power valves (cannot use OEM)
✅ Athena top-end gasket set with required seals and hardware
✅ Cast lite flat-top piston kit (piston, rings, clips, and pin)

Fitment

📦 Fits:

• 2001–2008 KTM 65 SX

• 2002–2008 KTM 65 XC

(Converts stock 65cc motor to approximately 80cc displacement. Compatible with OEM crankcase and bottom-end components.)

Key Features

• Increases displacement from 65cc to approximately 80cc

• Race-spec power valve and cylinder head system (non-OEM compatible)

• Nickel-carbide coated bore for maximum reliability and heat transfer

• Includes piston, gaskets, seals, and precision hardware

• Designed for competition and high-performance builds

Warranty Info

Manufactured by Athena S.p.A. (Italy).
Warranty and technical support provided directly through Athena.

Price & SKU

💲 Retail Price: $872.95
SKU: 0931-0245 / P400270100002
Estimated Shipping Weight: 3.28 lb
Availability: Ships Next Day