Wiseco Performance Piston KitPart Number: 4881M07700 Piston Size: 77.00mm These kits contain everything you need to complete your piston repair, the first time Dedicated forgings used for superior strength to weight ratio utilizing aerospace alloy. High Performance ring kit and alloy pin included with each piston kit for extended life and sustained power. Each piston is built from race proven designs that are chosen by the top race teams in all forms of racing including Supercross, Motocross, GNCC, Superbike, and more. All Piston Kits are precision crafted and forged in the USA Wiseco leads the performance aftermarket by producing the highest quality forged pistons for Dirt Bikes, ATV's, Snowmobiles, Outboard Marine, and Motorcycles right here in the USA. Wiseco is unique because we forge all of our own pistons in house, and produce all of our own forge tooling right here in the USA. Extreme racing conditions demand the strength and toughness that only forged pistons can offer. Compared to cast pistons, forgings are tougher and more durable, and will stand up to the abuse that high performance motorsport applications require. Most castings are brittle, have no grain structure and tend to fail catastrophically when the material yield strength is exceeded. Forgings have condensed grain that is aligned to the features of the part, which produces higher mechanical properties, and resistance to impact and fatigue. Each forging is designed to optimize the strength-to-weight ratio, and maximize performance. In addition, in-house dyno testing gives Wiseco the ability to develop state-of-the-art technology such as new shapes, coatings, and components, and lead the industry through rigorous R&D.Fits: 2010-15 Gas-Gas EC250F2005-13 Yamaha WR250F2005-07 Yamaha YZ250F Displacement: 250cc Standard Piston Size: 77.00mm Bore Oversize: STD Stroke: 53.60mm Compression Ratio: 13.5 : 1 Items Included Fitments
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