NAMURA NA-10040-4K +1.00MM Top End Repair Kit

Top End kit includes: piston, rings, wrist pin, clips, top end bearing, and gasket kit

MOS2 (Teflon/Molybdenum) Coated Skirts A rolled on application process provides a bond that is 10 times stronger than other spray on coatings. Benefits include increased heat transfer, reduced friction and helping to eliminate cold seizures

Machined Smooth Heads Reflects combustion heat and reduces carbon buildup, protecting the top of the piston. Some tests have shown this feature can increase horsepower and fuel economy by up to 6%

Anodized Domes Increases heat resistance and durability; pistons with anodized domes are 75% stronger than non-anodized pistons

Hypereutectic Casting Process Provides higher silicon content for reduced expansion rates and additional wear resistance; it also has an ability to withstand higher cylinder temperatures

Restore top-end performance with the NAMURA NA-10040-4K Top End Repair Kit. Designed for applications requiring a +1.00MM replacement, this kit provides a practical solution for refreshing a worn or damaged top-end assembly. NAMURA is recognized for producing replacement powersports engine components focused on dependable fit, consistent manufacturing, and service-ready performance. Use this kit when rebuilding an engine or replacing top-end components as part of routine maintenance or a larger repair project.
The NAMURA NA-10040-4K is supplied as a complete repair kit configuration, making it a convenient choice for technicians, rebuilders, and powersports enthusiasts who want to organize the required top-end service components under one part number. Its +1.00MM specification is intended for compatible applications that have been prepared for the corresponding oversize replacement. Always compare the part number, engine specifications, and required oversize designation with the original equipment and service information before installation.
For best results, inspect the cylinder, crankcase, connecting rod, and related engine components before assembly. Proper cylinder preparation, clean installation surfaces, correct lubrication, and adherence to the engine manufacturer’s torque and break-in procedures are essential to achieving reliable service life. Confirm the kit contents and application before ordering, since component configuration and compatibility can vary by engine model. The NAMURA NA-10040-4K offers a focused replacement option for top-end repair work where a +1.00MM solution is required.

Features:

• Brand: NAMURA replacement engine component kit

• Part Number: NA-10040-4K

• Product Type: Top end repair kit

• Oversize Specification: +1.00MM replacement configuration

• Application: Intended for compatible powersports engine top-end repairs and rebuilds

• Service Use: Suitable for replacing worn or damaged top-end components when the engine requires the specified oversize

• Installation Guidance: Verify engine