Motorcycle Engine Parts Piston Rings Kit Bore STD ~ +100 Size 77mm ~ 78mm Compatible With YAMAHA WR250F YZ250F WR250 YZ250 WR YZ 250 F(77.25mm)

Hi, dear friend,Please make sure your model will the model and compare with pictures provided here before purchasing! Thanks! If you have any questions, please feel to contact us.Feature- : - Material Type:Nodular Cast Iron- Condition: - Size: 77mm77.2577.5077.7578mm- Origin: China- OEM Code: 5NL-11631-00-00 5NL-11631-10-00 5NL-11603-00-001SM-11603-00-00- The package includes: as shown in the pictureOriginal accessories can be directly replacedNote: Please confirm the motorcycle that is Compatible With you before purchasing. If you have any questions about the product, please feel to contact us at any time.Compatible With YAMAHAWR250F 01-02 YZ250F 01-02 5NL-11631-00-00WR250F 03-04 YZ250F 03-04 5NL-11631-10-00WR250F 01-14 YZ250F 01-11 5NL-11603-00-00WR250F 15-18 YZ250F 14-18 1SM-11603-00-00WR250R WR250X 2007-2017Model Name : 5NL-11631-00-00 5NL-11631-10-00 5NL-11603-00-00 1SM-11603-00-00Origin : Mainland ChinaMaterial : Nodular Cast IronDiamter : 77mm 77.25 77.50 77.75 78mmBore Size : STD +25 +50 +75 +100No. of Cylinders: : 1 CylinderDear friends, welcome to our shop! We are a professional auto parts store. I hope our products can help you, and wish you a happy shopping!

• The combination of gas ring and oil ring with high precision machining can make the sealing pressure evenly distributed, which can control the air leakage of the cylinder within 0.5%, ensure the full combustion and improve the engine power.
• The oil scraper angle of oil ring is optimized by hydrodynamics, and the oil scraper efficiency is improved by 30%, which can effectively reduce the oil channeling, reduce the oil consumption and avoid the phenomenon of oil burning.
• It can maintain stable elasticity and sealability in the high temperature environment of 250℃, adapt to high temperature working conditions such as turbocharged engines, and will not lead to seal failure due to thermal deformation.
• Compared with the traditional piston ring, it reduces the friction loss by 20% and improves the fuel economy of the engine.
• The surface of the new ring is specially honed, and the running-in period is shortened to 500 kilometers, avoiding the problems of power loss and excessive oil consumption during the running-in period.