{"product_id":"piston-kit-98mm-yamaha-yz-wr-450-03-15-athena-s4f09800005a-478cc-big-bore","title":"PISTON KIT 98MM YAMAHA YZ\/WR 450 03-15, ATHENA S4F09800005A 478CC BIG BORE","description":"\u003cp\u003eATHENA Forged Racing Piston Ø 97,94 mm for Athena Big Bore Cylinder - S4F09800005A\u003c\/p\u003e \u003cp\u003eDescription\u003c\/p\u003e \u003cp\u003eAthena, leader in producing motorcycle spare parts for over 40 years,  offers a wide range of 2-stroke and 4-stroke off-road forged pistons  made by reverse extrusion. Produced with cutting-edge CNC machining  tools, which ensure dimensional tolerances of less than 0.01 mm, Athena  pistons are made of a special high-performance aluminum alloy with high  silicon content that guarantee the same reliability of the OE piston,  while at the same time providing greater resistance and excellent  performance. The perfectly smooth profile ensures a regular flow and the  perfect flame propagation.\u003c\/p\u003e \u003cp\u003eSome pistons’ skirts are moreover treated with a molybdenum disulfide  coating applied by screen printing which further reduce friction to  enhance performance and durability.\u003c\/p\u003e \u003cp\u003eAthena engineers ensure advanced technical solutions and the highest  quality standards equal to or better than those adopted in OE  production, so as to guarantee performance and reliability.\u003c\/p\u003e \u003cp\u003eEach piston, engineered in Italy by Athena R\u0026amp;D department, is  tested on engine dynamometer benches under progressive stress load, and  thereafter on track to validate its performance even in the most extreme  conditions.\u003c\/p\u003e \u003cp\u003eThe proven quality of Athena pistons is offered at an extremely affordable price.\u003c\/p\u003e \u003cp\u003eThis piston for Athena Big Bore cylinder kit is equipped with piston  rings that guarantee less friction with the cylinder and therefore a  higher performance.\u003c\/p\u003e \u003cp\u003eAthena takes care of the development of the pistons down to the  smallest detail: the rings are produced in Japan with wear-resistant  coatings (PVD or chromium nitride) to increase the retain and the  durability. The rings perfectly adapt to the cylinder liner even at low  tangential load.\u003c\/p\u003e \u003cp\u003eThis piston kit contains the piston, the pin, the circlips, and the  piston rings. All components are replaceable and interchangeable in case  of need.\u003c\/p\u003e \u003cp\u003eAll Athena products produced in greater displacement and power than  those provided by the road code of the user's country, are intended  exclusively for competitive use. Athena declines all responsibility for  any use of the product contrary to national regulations.\u003c\/p\u003e \u003cp\u003eGuarantee of compliance should not be applicable to products destined  for competitive sports use or which are used in high-performance or  high-speed applications unless it is a clear case of faultiness.\u003c\/p\u003e \u003cp\u003eTechnical features\u003c\/p\u003e \u003cul\u003e \u003cli\u003eBig End Pin Diameter (mm)  18x9x51\u003c\/li\u003e \u003cli\u003eBore Diameter (mm)  97.94\u003c\/li\u003e \u003cli\u003eCompression Height (mm)  23.50\u003c\/li\u003e \u003cli\u003eCompression Ratio  12.4:1\u003c\/li\u003e \u003cli\u003eDisplacement (cc)  450\u003c\/li\u003e \u003cli\u003eNet Weight (Kg)  0.39\u003c\/li\u003e \u003cli\u003eNumber Of Segments  2\u003c\/li\u003e \u003cli\u003ePiston Pin Type  Biconical\u003c\/li\u003e \u003cli\u003ePiston Type  Forged\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eVehicle compatibility\u003c\/p\u003e \u003cul\u003e \u003cli\u003eYAMAHA WR F 450 cc 2003\/2015\u003c\/li\u003e \u003cli\u003eYAMAHA YZ F 450 cc 2003\/2010 \u003c\/li\u003e \u003c\/ul\u003e","brand":"Athena","offers":[{"title":"Default Title","offer_id":51396970840330,"sku":"56-k114_98.pia","price":222.18,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0898\/2757\/4026\/files\/image-1-6E27DA70-C5C9-4273-AB79-27F2CA90CB7C_56-K114_98.PIA.jpg?v=1750759142","url":"https:\/\/2bros-mx.com\/products\/piston-kit-98mm-yamaha-yz-wr-450-03-15-athena-s4f09800005a-478cc-big-bore","provider":"2bros-mx.com","version":"1.0","type":"link"}