Athena Big Bore Cylinder Kit P400270100002 — KTM 65 SX / XC 2001-2008

Product Description

Unlock the true potential of your KTM 65 with the Athena Big Bore Cylinder Kit. Designed to push your displacement to 80cc, this kit is engineered for riders who demand a competitive edge on the track. By upgrading your top end with this premium aluminum cylinder, you gain a significant boost in power and torque, transforming the way your bike performs under racing conditions.

This kit features a precision-machined cylinder with a durable nickel carbide coating for exceptional heat dissipation and longevity. It includes an advanced aluminum cylinder head with a removable bronze dome for optimized combustion, along with a high-performance Cast Lite piston kit. Athena has also included a complete top-end gasket set and specially designed power valves to ensure that every component works in perfect harmony for maximum output at high RPMs.

Top Features: Athena Big Bore Cylinder Kit

• Increases displacement to 80cc for superior power delivery
• Lightweight aluminum cylinder with nickel carbide coating for reduced friction
• Includes high-performance hard anodized power valves
• Aluminum cylinder head features a removable bronze dome for improved cooling
• Complete kit includes Cast Lite piston, rings, clips, pin, and top-end gaskets

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Will I need to make any modifications to my cases to run this big bore kit?
A: This Athena big bore kit is designed to be a bolt-on performance upgrade for the models listed, but we always recommend a professional installation to ensure correct squish clearance and jetting adjustments for the new displacement.

Q: Why does the kit include its own power valves?
A: Athena includes specially designed, hard-anodized power valves because they are precision-engineered to match the flow and geometry of this specific big bore cylinder. OEM valves are not compatible with this kit.

Expert Pro-Tip: When moving to a big bore kit, your engine will be processing more air and fuel. You must re-jet your carburetor to match the increased displacement. If you run the stock jetting, the engine will likely run lean, leading to overheating or even catastrophic piston damage. Always perform a plug chop after the first test ride to verify your jetting is spot on.

Recommended Pairings:
o KTM 65 SX Performance Parts & Upgrades
o Premium Motorcycle Chemicals
o KTM 2-Stroke Performance Parts

About Moto-House MX

At Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their bikes. Every order ships fast from our Central Florida location.

Moto-House MX – Choice of Champions – Clermont / Montverde, FL. Central Florida's premier powersports source with lightning-fast worldwide shipping.