Namura Pistons Top End Kits
Namura 2 Stroke Top End kits include Piston, Rings, Pin, Clips, Top end Bearing, and Top End Gasket Kit.
NAMURA is proud to bring you the next step in the evolution of powersport pistons.
The new HYPERDRYVE line of pistons is composed of a space-age hypereutectic aluminum alloy developed by NASA. Engineered to maintain its high tensile strength up to 700° F(370°C), 50% higher than a conventional cast piston, this gives HYPERDRYVE the strength to perform under operating conditions normally reserved for forged pistons.HYPERDRYVE is the exclusive line of pistons for 250 and 450CC motocross bikes, as well as select sport quads.
We had engineers run some tests; the images below show two cast aluminum pistons that have been magnified to 1,000 nanometers. Both pistons were soaked for 100 hours at 600° F (316° C) to simulate operating conditions. It's easy to see that the conventional aluminum alloy's particles coarsen significantly, this weakening of the material's bonds will lead to a sharp drop in piston strength. The particles of NAMURA’s new aluminum alloy have only coarsened slightly, showing that they are still able to maintain a higher strength for longer periods.
Additional testing (results featured below) shows that the biggest hardness drop occurs after 10 hours of use; NAMURA’s new aluminum alloy still maintains twice the hardness of conventional alloys, even after 20 hours!
This revolutionary alloy, combined with our already existing features of machined smooth anodized heads (for better heat reflection) & MOS2 coated skirts (giving you smoother startups & break ins) meets the demands of today's 4-stroke engines.