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GhostBikes.com£624.99Visit shop Athena Aluminum/Natural P400485100019 - Cylinder Kit For Yamaha Dt125r 1991-2002
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This Athena Cylinder Kit is designed for Yamaha DT125R 1991-2002 models, offering a significant performance upgrade for off-road enthusiasts and racers. Its key benefit is maximized horsepower and extended service life through advanced materials and design. A primary consideration is that it requires specially designed power valves and cannot use OEM parts. The kit features an aluminum cylinder with a nickel-carbide coating and larger water jackets for improved cooling, a high-performance hard-anodized power valve, and a forged piston with a molybdenum coating.
| Model Part Number | P400485100019 |
|---|---|
| Brand | Athena |
No, this Athena kit requires specially designed, high-performance power valves that are part of the kit or sold separately by Athena. OEM power valves are not compatible.
This is a 125 cc kit with a standard bore of Ø 56 mm.
While built to high standards, this kit is optimized for performance and racing applications, making it ideal for off-road and track use. Road legality may vary by region and specific modifications.
The nickel-carbide coating enhances the cylinder's durability, wear resistance, and heat dissipation, contributing to improved performance and a longer service life.
Yes, the kit includes a forged piston with a molybdenum coating for reduced friction and enhanced durability.
A proper break-in procedure is crucial. This typically involves specific run-in cycles at varying RPMs to ensure the coating properly seats. Consult the included documentation for precise break-in instructions.
Verify correct installation of the power valves, ensuring they are not sticking. Check for proper air-fuel mixture and ignition timing. Ensure the break-in procedure was followed correctly.
Check coolant level and condition. Inspect radiator and hoses for obstructions or leaks. Ensure the fan (if applicable) is functioning correctly. Verify the cooling system is properly bled of air.
Check fuel delivery, spark plug condition, and ignition system. Ensure all electrical connections are secure. Verify compression is within specifications.
Immediately stop the engine and inspect for loose components. Check piston-to-cylinder clearance and rod bearing play. Consult a professional mechanic if unsure.
Compatibility: This kit is designed for Yamaha DT 125 R/RE/X, TDR 125, and TZR 125 R / RR models from 1991 onwards. It is also compatible with Derbi GPR 125. Crucially, it requires specially designed, Athena-supplied power valves; OEM power valves are not compatible.
Setup: Proper installation is critical. Ensure all components are clean before assembly. The cylinder bore is 56 mm. Professional installation is highly recommended to ensure correct alignment, piston ring gap, and cylinder head torque specifications. A proper break-in procedure, particularly for the molybdenum-coated piston, is essential to achieve maximum performance and longevity. This may involve specific oil mixtures and varying engine speeds for the initial hours of operation.
Care: Regular maintenance includes checking the cooling system for leaks and ensuring coolant levels are optimal. Monitor exhaust port for carbon buildup. Avoid high-revving immediately after starting a cold engine. Periodic checks of the power valve operation are advised.
