{"product_id":"wiseco-piston-and-gasket-kit-69-50mm-honda-atc250r-1985-1986","title":"Wiseco Piston and Gasket Kit 69.50mm - Honda ATC250R, TRX250R (1985-1986)","description":"\u003cp\u003eWiseco has been forging two-stroke pistons in Mentor, Ohio since long before most of the machines on this list rolled off the line, and this is the same high-silicon aluminum alloy forging that made their reputation. A forged piston moves heat better and tolerates detonation far better than the cast slug that came in it from the factory, which matters on an air-cooled engine and matters even more on a machine that has been sitting in a shed for thirty years. The forging design and skirt profile are built to make real horsepower and torque rather than just fill a bore, and every kit ships complete with the rings, wrist pin and circlips you need to close the top end back up. If you are rebuilding a vintage three-wheeler or an old dune machine, this is the part that decides whether it runs for one season or for twenty. Made in the USA.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e This is an oversize piston. Your cylinder must be bored to 69.50mm before this will fit. If your cylinder is still standard, order the standard bore version instead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e✓ Fits\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e1985-1986 Honda ATC250R (liquid cooled)\u003c\/li\u003e\n\u003cli\u003e1986 Honda TRX250R\u003c\/li\u003e\n\u003cli\u003eStock bore and stroke 66 x 72mm • 246cc • liquid cooled • Pro-Lite\u003c\/li\u003e\n\u003cli\u003eThis listing is 69.50mm bore, +3.50 over\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003e✓ Features\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eForged from high-silicon aluminum alloy for maximum strength and dependability\u003c\/li\u003e\n\u003cli\u003eInnovative forging design and piston skirt profile provide maximum horsepower and torque\u003c\/li\u003e\n\u003cli\u003eHandles heat and detonation far better than the original cast piston\u003c\/li\u003e\n\u003cli\u003eUses circlip CW18\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003e✓ What's Included\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eForged piston\u003c\/li\u003e\n\u003cli\u003ePiston rings\u003c\/li\u003e\n\u003cli\u003eWrist pin\u003c\/li\u003e\n\u003cli\u003eCirclips\u003c\/li\u003e\n\u003cli\u003eTop end gasket set\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis is the PK kit version, which means the top end gasket set is in the box along with the piston. If you are tearing the top end down anyway, this saves you sourcing gaskets separately. Cylinder sleeves are sold separately.\u003c\/p\u003e\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":48767092326625,"sku":"0903-0469","price":284.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/Screenshot2026-07-23213703.png?v=1784867838","url":"https:\/\/dunegoonshop.com\/products\/wiseco-piston-and-gasket-kit-69-50mm-honda-atc250r-1985-1986","provider":"Dune Goons","version":"1.0","type":"link"}