{"product_id":"moose-offroad-mse24391b-piston-kit-71-96-mm-cast-replica-2013-2017-beta-300-rr","title":"Moose Offroad MSE24391B Piston Kit — 71.96 mm Cast Replica — 2013-2017 Beta 300 RR","description":"\u003cp\u003e\u003cb\u003eMoose Offroad MSE24391B — Gravity Cast Aluminum Alloy, 18% Silicon Wear Resistance, and Molybdenum Disulphite Coated Skirts\u003c\/b\u003e\u003c\/p\u003e\n\n\u003cp\u003eRestore the legendary \"grunt\" and compression of your 2-stroke powerplant with the Moose Offroad MSE24391B Piston Kit. Engineered as a high-performance OE replacement for the 2013-2017 Beta 300 RR, this 71.96 mm piston kit is designed to return your engine to factory-spec tolerances. While many aftermarket pistons sacrifice longevity for weight, Moose utilizes a gravity-cast aluminum alloy infused with 18% silicon. This high silicon content is critical for 2-stroke applications as it significantly reduces thermal expansion and increases the piston's resistance to wear, ensuring a stable fit within the cylinder even under extreme heat.\u003c\/p\u003e\n\n\u003cp\u003eTo ensure a reliable top-end rebuild, the MSE24391B features a Molybdenum Disulphite (MOS2) coated skirt. This specialized coating acts as a dry lubricant during the critical initial break-in period, reducing friction and preventing scuffing before the oil film fully stabilizes. The included wrist pin is nitride-coated, creating a diamond-hard bearing surface that resists galling and wear. Every kit is a complete top-end solution, providing the cast replica piston, high-tensile wear-resistant rings, the nitride wrist pin, and high-tension circlips. With a stock compression ratio, this kit maintains the smooth, predictable power delivery that Beta 300 riders depend on for technical trails.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cb\u003eHigh-Silicon Aluminum Alloy:\u003c\/b\u003e 18% silicon content reduces thermal distortion and provides superior resistance to skirt wear.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eMOS2 Coated Skirts:\u003c\/b\u003e Molybdenum Disulphite coating aids in lubrication and ensures a safe, scuff-free break-in process.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eNitride-Coated Wrist Pin:\u003c\/b\u003e Hardened bearing surface significantly increases the lifespan of the small-end bearing interface.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eComplete Rebuild Kit:\u003c\/b\u003e Includes the cast replica piston, high-performance rings, wrist pin, and circlips.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eOE Compression Spec:\u003c\/b\u003e Maintains the original engine characteristics and reliability of the 2013-2017 Beta 300 RR.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cb\u003eMoto-House MX Pro Tip:\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eTop-end maintenance is the lifeblood of a high-performance 300cc 2-stroke. This 71.96 mm piston is designed for a standard 72.00 mm cylinder bore. Before installation, we highly recommend measuring your cylinder with a dial bore gauge to ensure you have the proper 0.04 mm clearance. When assembling, always install the circlips with the opening facing either 12 o'clock or 6 o'clock to prevent inertia from unseating them at high RPM. Pair this kit with a fresh top-end gasket set and a new needle bearing to ensure your Beta 300 RR continues to dominate the technical terrain for seasons to come.\u003c\/p\u003e\n\n\u003ctable style=\"width:100%; border-collapse: collapse;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background-color: #f2f2f2;\"\u003e\n      \u003cth style=\"border: 1px solid #dddddd; padding: 8px;\"\u003eTechnical Specification\u003c\/th\u003e\n      \u003cth style=\"border: 1px solid #dddddd; padding: 8px;\"\u003eDetails\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #dddddd; padding: 8px; text-align: center;\"\u003ePiston Diameter\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #dddddd; padding: 8px; text-align: center;\"\u003e71.96 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #dddddd; padding: 8px; text-align: center;\"\u003eCylinder Diameter\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #dddddd; padding: 8px; text-align: center;\"\u003e72.00 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #dddddd; padding: 8px; text-align: center;\"\u003ePiston Material\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #dddddd; padding: 8px; text-align: center;\"\u003eGravity Cast High-Silicon Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border: 1px solid #dddddd; padding: 8px; text-align: center;\"\u003eSkirt Coating\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #dddddd; padding: 8px; text-align: center;\"\u003eMolybdenum Disulphite (MOS2)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFAQ Questions\u003c\/h3\u003e\n\u003cp\u003eQ) \u003cb\u003eIs this a forged or cast piston?\u003c\/b\u003e\u003cbr\u003e\nA) This is a Cast Replica piston. Cast pistons are preferred by many off-road riders for their higher silicon content, which allows for tighter clearances and quieter operation compared to forged alternatives.\u003c\/p\u003e\n\n\u003cp\u003eQ) \u003cb\u003eDoes this kit include the top-end gaskets?\u003c\/b\u003e\u003cbr\u003e\nA) No, this kit includes the piston, rings, wrist pin, and circlips. Top-end gasket sets are sold separately and are required for a proper rebuild.\u003c\/p\u003e\n\n\u003cdiv class=\"silo-links\"\u003e\n  \u003ca href=\"\/search?q=Beta+300+RR+Gasket+Kit\"\u003eBeta 300 RR Gasket Kits\u003c\/a\u003e | \n  \u003ca href=\"\/search?q=2-Stroke+Top+End+Bearings\"\u003eWrist Pin Needle Bearings\u003c\/a\u003e | \n  \u003ca href=\"\/search?q=Moose+Offroad+Engine\"\u003eShop All Moose Engine Parts\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003cp style=\"text-align: center;\"\u003e\u003cb\u003eMoto-House MX – Choice of Champions\u003c\/b\u003e – is located in Clermont\/Montverde, FL. We are the best motocross shop in Central Florida with lightning-fast shipping.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"name\": \"Moose Offroad MSE24391B Piston Kit Beta 300 RR\",\n  \"image\": [],\n  \"description\": \"Premium 71.96 mm cast replica piston kit for 2013-2017 Beta 300 RR. Includes MOS2 coated piston, rings, wrist pin, and circlips.\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"MOOSE OFFROAD\"\n  },\n  \"sku\": \"MSE24391B\",\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"availability\": \"https:\/\/schema.org\/InStock\",\n    \"priceCurrency\": \"USD\"\n  }\n}\n\u003c\/script\u003e","brand":"MOOSE OFFROAD","offers":[{"title":"Default Title","offer_id":44495825305683,"sku":"MSE24391B","price":99.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/1343733.png?v=1776227350","url":"https:\/\/motohousemx.com\/products\/moose-offroad-mse24391b-piston-kit-71-96-mm-cast-replica-2013-2017-beta-300-rr","provider":"Moto-House MX","version":"1.0","type":"link"}