{"product_id":"wossner-8869d050-piston-kit-honda-trx420-rancher-420-0-50mm","title":"Wossner 8869D050 Piston Kit - Honda TRX420 Rancher 420 (+0.50mm)","description":"\u003ch3\u003eWossner 8869D050 Pro Series Forged 4-Stroke Piston Kit - +0.50mm Oversize\u003c\/h3\u003e\n\n\u003cp\u003eRestore the legendary reliability of your Honda Rancher with the Wossner 8869D050 Piston Kit. This +0.50mm oversize forged kit is specifically engineered for the Honda TRX420 series, providing a high-performance solution for engines requiring a cylinder bore refresh. At Moto-House MX, we know the Rancher 420 is a staple for both utility work and trail riding; Wossner’s Pro Series components ensure your ATV maintains \"Factory Quality\" power and durability for years to come.\u003c\/p\u003e\n\n\u003cp\u003eForged from aerospace-grade aluminum alloy, this piston is significantly stronger than a standard cast replacement. The Pro Series design features enhanced piston pin oiling slots and radial boss machining to ensure the wrist pin stays lubricated under heavy loads. With a 10.0:1 compression ratio and a permanent skirt coating to reduce friction, this kit provides a quieter-running engine and a more efficient break-in period, even in the most demanding off-road conditions.\u003c\/p\u003e\n\n\u003ch3\u003eTop Features: Wossner 8869D050 Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eOversize +0.50mm (86.95mm Piston):\u003c\/b\u003e Designed for 87.00mm bores, perfect for cleaning up worn cylinders and restoring compression.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003ePro Series Forged Construction:\u003c\/b\u003e Aerospace aluminum alloy provides superior structural integrity and heat resistance compared to cast pistons.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eAdvanced Lubrication:\u003c\/b\u003e Radial boss machining and annular grooves deliver consistent oil flow to the wrist pin.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eLow-Friction Skirt Coating:\u003c\/b\u003e Permanent coating reduces piston rock and internal drag for smoother engine operation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003ePrecision Ring Seal:\u003c\/b\u003e Specialized ring land treatment improves oil control and minimizes combustion blow-by.\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 Honda TRX420 engine is known for its durability, but over time, utility use can lead to cylinder wear. This +0.50mm kit is the professional choice for an engine rebuild that requires a fresh bore and hone. Always verify your machinist matches the cylinder bore to this 86.95mm piston to ensure the correct piston-to-wall clearance for a long-lasting engine life.\u003c\/p\u003e\n\n\u003ch3\u003eFitment Guide\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" style=\"width: 100%; border-collapse: collapse;\"\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003eModel Group\u003c\/th\u003e\n            \u003cth\u003eYear Range\u003c\/th\u003e\n            \u003cth\u003eSpecific Models\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cb\u003eHonda TRX420 Rancher (All)\u003c\/b\u003e\u003c\/td\u003e\n            \u003ctd\u003e2014-2025\u003c\/td\u003e\n            \u003ctd\u003eFM1, FE1, TE1, TM1, FA1\/2\/5\/6, NorthStar\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cb\u003eHonda TRX420 Rancher (EFI\/AT)\u003c\/b\u003e\u003c\/td\u003e\n            \u003ctd\u003e2007-2014\u003c\/td\u003e\n            \u003ctd\u003eFM, FE, TE, TM, FPA, FPE, FPM\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: No, this is an \u003cb\u003eOversize (+0.50mm)\u003c\/b\u003e piston. Your cylinder must be bored and honed to 87.00mm to accommodate this kit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eQ: Does this kit include a top-end gasket set?\u003c\/b\u003e\u003cbr\u003e\nA: No, the kit includes the piston, rings, wrist pin, and pin locks. A complete top-end gasket set is required for a leak-free rebuild and is sold separately.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eQ: Why upgrade to a forged piston for a utility ATV?\u003c\/b\u003e\u003cbr\u003e\nA: Forged pistons are much stronger and better at dissipating heat than cast pistons. For a machine like the Rancher that often handles heavy towing or slow technical trails, a forged piston provides a higher margin of safety against engine failure.\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 Ensure a professional, leak-free seal during your rebuild.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eHigh-Performance 4-Stroke Oil:\u003c\/b\u003e Protect your new forged piston with premium lubrication designed for ATV engines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eRestore your Honda Rancher’s performance 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 8869D050 Piston Kit\",\n  \"image\": [],\n  \"description\": \"Premium Wossner 8869D050 Forged 4-Stroke Piston Kit for Honda TRX420 Rancher models. 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