Namura 186-4015 / NA-40015K Piston Gasket Top End Rebuild Kit Set Combo 1992-2009 Yamaha

NAMURASKU: 12WPS_186-4015

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Brand/MPN: Namura 186-4015 / NA-40015K

  • Designed for the 1992-2000 Yamaha Timberwolf 250, 1999-2004 Yamaha Bear Tracker 250, 2005-2006 Yamaha Bruin 250, 2007-2009 Big Bear 250

  • Piston Size - 70.95mm; 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

  • 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%

  • 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.

Namura's Top-End Kit, which includes everything you need to get your ride operational again; piston, a top-end gasket kit and wrist-pin bearings (where applicable) are all included in this convenient, time saving kit. Everything you see for a proper hassle free installation. Namura pistons have Molybdenium/Teflon skirt coatings to minimize resistance for extended life. All Namura pistons have anodized domes and high silicone content for superior heat resistance and strength.

Please refer to your vehicle owners manual for additional fitment and compatibility information

Product Specifications


MPN: 186-4015 / NA-40015K

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