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eBay£656.43Visit shop ATHENA Big Bore Cylinder kit-Ø85mm Honda crf250r for Moto Spares Accessories
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The Athena Big Bore Race Cylinder Kit is designed for Honda CRF250R 2018-2024 owners seeking enhanced engine performance. Its primary benefit is increased power output through a larger displacement and optimized components. A key consideration is that it does not include the cylinder head, which must be sourced separately.
| Model Part Number | P400210100067 |
|---|---|
| Brand | Athena |
The kit includes an aluminum cylinder with nickel-carbide coating, a forged piston with molybdenum coating, and specially designed power valves. It does *not* include the cylinder head.
This kit is designed for Honda CRF250R models manufactured between 2018 and 2024.
No, this kit requires the use of Athena's specially designed, high-performance power valves. OEM power valves are not compatible.
No, the cylinder head is not included in this kit and must be purchased separately.
The nickel-carbide coating enhances durability and provides excellent heat dissipation, contributing to the longevity and performance of the cylinder.
While not strictly mandatory, professional installation is highly recommended due to the complexity of engine modifications and the need for precise tuning to achieve optimal performance and avoid potential damage.
The larger bore increases the engine's displacement, which directly translates to more power and torque throughout the RPM range, improving acceleration and overall responsiveness.
Verify correct installation of power valves. Ensure proper fuel-air mixture and ignition timing. Check for air leaks in the intake system.
Confirm adequate coolant level and condition. Bleed the cooling system to remove air pockets. Check for blockages in radiator or water jackets.
Check piston ring installation and compression. Inspect valve seals for wear. Verify correct oil level and type.
Ensure fuel delivery is adequate and the ignition system is functioning correctly. Check spark plug condition.
Setup: Installation requires advanced mechanical knowledge. The kit includes an aluminum cylinder and a forged piston, but the cylinder head is not provided. Ensure all components are torqued to specification. Professional installation is highly recommended to ensure proper fitment and performance.
Compatibility: This kit is specifically designed for the Honda CRF250R models from 2018 to 2024. It requires the use of Athena's specially designed, high-performance power valves; OEM power valves cannot be used.
Care: Regular maintenance is crucial. Monitor coolant levels and condition closely. Ensure the cooling system is free of debris. Use high-quality engine oil and follow recommended oil change intervals for high-performance engines. Clean the cylinder and piston assembly during engine rebuilds as per service manual guidelines.
