{"product_id":"wossner-k8877da-2-piston-kit-polaris-rzr-800-ranger-800-sportsman-800-size-a","title":"Wossner K8877DA-2 Piston Kit - Polaris RZR 800 Ranger 800 Sportsman 800 Size A","description":"\u003ch3\u003eWossner K8877DA-2 Premium Forged 4-Stroke Piston Kit - Standard Size A\u003c\/h3\u003e\n\n\u003cp\u003eRestore the rugged performance and reliability of your Polaris 800 power plant with the Wossner K8877DA-2 Piston Kit. Specifically designed for the 800cc twin-cylinder engines found in the Polaris RZR, Ranger, and Sportsman, this Standard Size A forged kit is the professional choice for maintaining Factory Quality performance. At Moto-House MX, we know that Polaris owners demand durability for work and play; Wossner’s aerospace-grade forged components provide a significant upgrade over stock cast pistons for your UTV or ATV.\u003c\/p\u003e\n\n\u003cp\u003eForged from aerospace-grade aluminum alloy, the K8877DA-2 maintains a steady 10.0:1 compression ratio, ideal for the versatile torque needed in utility and sport applications. This piston features advanced radial boss machining and enhanced oiling slots for superior wrist pin lubrication—a critical feature for long-term engine health in high-duty cycle vehicles. The permanent skirt coating reduces internal friction and piston rock, resulting in a quieter-running engine and a more controlled break-in period.\u003c\/p\u003e\n\n\u003ch3\u003eTop Features: Wossner K8877DA-2 Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eStandard Size A (79.93mm Piston):\u003c\/b\u003e Precision-engineered for the standard 80.00mm bore to restore factory-spec clearances and mechanical efficiency.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003e10.0:1 Compression Ratio:\u003c\/b\u003e Designed to match original equipment specifications for reliable, consistent power in all conditions.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eAerospace Forged Alloy:\u003c\/b\u003e Superior strength and thermal resistance compared to OEM cast pistons, perfect for heavy-duty UTV and ATV use.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eAdvanced Lubrication:\u003c\/b\u003e Radial boss machining and annular grooves ensure consistent oil delivery to the wrist pin under heavy loads.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eLow-Friction Skirt Coating:\u003c\/b\u003e Permanent coating protects cylinder walls and minimizes mechanical drag for smoother engine operation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eComplete Assembly:\u003c\/b\u003e Kit includes the forged piston, high-performance rings, wrist pin, and pin locks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cb\u003eExpert Pro-Tip:\u003c\/b\u003e The Polaris 800 engine is a workhorse, but high hours and heavy dust ingestion can take their toll on the top end. When installing the K8877DA-2, always verify your cylinder bore for roundness and ensure your cooling system is functioning perfectly. Because these engines often operate in harsh environments, using a fresh top-end gasket kit and high-quality synthetic oil is essential to ensure your new forged pistons provide years of trouble-free service.\u003c\/p\u003e\n\n\u003ch3\u003eFitment List\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" style=\"width: 100%; border-collapse: collapse;\"\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003eBrand\u003c\/th\u003e\n            \u003cth\u003eModels\u003c\/th\u003e\n            \u003cth\u003eYear Range\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cb\u003ePolaris\u003c\/b\u003e\u003c\/td\u003e\n            \u003ctd\u003eRZR 800 \/ LE \/ S \/ EPS \/ Walker Evans\u003c\/td\u003e\n            \u003ctd\u003e2008-2014\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cb\u003ePolaris\u003c\/b\u003e\u003c\/td\u003e\n            \u003ctd\u003eRanger 800 \/ EFI \/ HD \/ XP \/ 6x6\u003c\/td\u003e\n            \u003ctd\u003e2010-2017\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cb\u003ePolaris\u003c\/b\u003e\u003c\/td\u003e\n            \u003ctd\u003eSportsman 800 EFI \/ 6x6 \/ Big Boss \/ MV\u003c\/td\u003e\n            \u003ctd\u003e2005-2014\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eQ: Is this a Standard Size piston?\u003c\/b\u003e\u003cbr\u003e\nA: Yes, this is the 79.93mm piston designed for the standard 80.00mm bore. It is the correct choice for cylinders that are still within factory service limits.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eQ: Why should I upgrade to a forged piston for my Ranger or RZR?\u003c\/b\u003e\u003cbr\u003e\nA: Forged pistons are much stronger than the factory cast pistons. They handle heat and mechanical stress significantly better, which is vital for UTVs that are used for towing, hauling, or high-speed trail riding.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eQ: Does this kit include the gaskets?\u003c\/b\u003e\u003cbr\u003e\nA: No, the kit includes the forged piston, rings, wrist pin, and locks. A top-end gasket kit is sold separately and is required for a professional, leak-free reassembly.\u003c\/p\u003e\n\n\u003ch3\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eComplete Top End Gasket Set:\u003c\/b\u003e Required for a professional seal and proper compression.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eHeavy-Duty Air Filter:\u003c\/b\u003e Protect your new investment by ensuring clean air intake in dusty off-road conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eRestore your machine’s power and precision today. Buy now at Moto-House MX!\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eMoto-House MX – Choice of Champions\u003c\/b\u003e – is located in Clermont\/Montverde, FL. The Best Motocross\/UTV \u0026amp; ATV Shop in Central Florida. Stop by our local store in Montverde, FL or enjoy lightning-fast shipping across the USA.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"name\": \"Wossner K8877DA-2 Piston Kit\",\n  \"image\": [],\n  \"description\": \"Premium Wossner K8877DA-2 Forged 4-Stroke Piston Kit for Polaris 800cc models including RZR, Ranger, and Sportsman. 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