{"product_id":"m-works-mw-r21m5-osspeed-r21-m5-marine-engine","title":"O.S.Speed R21-M5 Marine Engine M-Works","description":"\u003cstrong\u003eProduct Info:\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eO.S.SPEED R21-M5 M-Works Marine Racing 3.5cc Engine\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003cimg src=\"\/dokument\/bibliotek\/Image\/MC2\/Loggor\/R21-M5-logo-1000px.png\" width=\"560\" height=\"185\" alt=\"\"\u003e\u003cbr\u003eThis is the new 2026-edition Minicars Works O.S.SPEED R21-M5 3.5cc long-stroke competition engine!\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e2026 Update: New M-Works Larger Volume Cooling Head with Stainless Nipples\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eCombustion chamber with smaller volume for low nitro \u0026amp; updated piston for easier run-in\u003c\/li\u003e\n\u003cli\u003eDLC coated \u0026amp; balanced \"SG-type\" crankshaft (4.5mm balance weights)\u003c\/li\u003e\n\u003cli\u003e9-port cylinder liner with 3-port exhaust\u003c\/li\u003e\n\u003cli\u003eBackplate with steel thrust plate for lower friction and increased durability\u003c\/li\u003e\n\u003cli\u003eNo carb included - choose your own carburetor (15mm diameter neck)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cstrong\u003eSuitable for competition boats (experience level ”high”):\u003c\/strong\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eHydroplanes\u003c\/li\u003e\n\u003cli\u003eOffshore (with gear deduction)\u003c\/li\u003e\n\u003cli\u003eEndurance (with gear reduction)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003e\u003cbr\u003eRecommended fuel:\u003c\/strong\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003e12% nitro fuel with 8% Klotz Benol oil + 4% Original Techniplate\u003c\/li\u003e\n\u003cli\u003e\u003cem\u003eDon't run the engine with less oil than the above recommended levels. You may add more recin\/castor oil (Klotz Benol) in extreme conditions and heavy loads.\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cstrong\u003ePerformance R21-M5 vs R21-M6:\u003c\/strong\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eThe M5 has normal high timing numbers in the crankshaft and piston liner - the R21-M6 has more timing everywhere (more peak power but narrower power-band).\u003c\/li\u003e\n\u003cli\u003eThe M5 is the highest performance out-of-the box engine for hydroplanes with direct-drive (2025 iMBRA Hydro World Champion).\u003c\/li\u003e\n\u003cli\u003eIn Endurance and Offshore, the R21-M5 is easier to set-up as it's less peaky and have more torque vs the R21-M6.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cstrong\u003eSpecs:\u003c\/strong\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eDisplacement: 3.49cc\u003c\/li\u003e\n\u003cli\u003eBore: 16.08mm\u003c\/li\u003e\n\u003cli\u003eStroke: 17.2mm\u003c\/li\u003e\n\u003cli\u003eCrankshaft dia: 14mm\u003c\/li\u003e\n\u003cli\u003ePractical r.p.m. Range: 4.000～43.000\u003c\/li\u003e\n\u003cli\u003eOutput: 2.76hp @ 35.000r.p.m.\u003c\/li\u003e\n\u003cli\u003eWeight: 256g\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cstrong\u003eIncluded:\u003c\/strong\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eO.S.Speed M-Works R21-M5 Marine Engine\u003c\/li\u003e\n\u003cli\u003eRP6 Glowplug\u003c\/li\u003e\n\u003cli\u003eO.S.Speed flywheel cone\u003c\/li\u003e\n\u003cli\u003eO.S.Speed decal\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cimg src=\"\/bilder\/artiklar\/zoom\/OS0R21M05_14.jpg\" width=\"560\" height=\"547\" alt=\"\"\u003e\u003cbr\u003e9-port sleeve with a 3-port exhaust\u003cbr\u003e\u003cbr\u003e\u003cimg src=\"\/bilder\/artiklar\/zoom\/OS0R21M05_16.jpg\" alt=\"\" width=\"560\"\u003e\u003cbr\u003eDLC coated crankshaft with improved balance\u003cbr\u003e\u003cbr\u003e\u003cimg src=\"\/bilder\/artiklar\/zoom\/OS0R21M05_10.jpg\" width=\"560\" height=\"510\" alt=\"\"\u003e\u003cbr\u003eSteel insert backplate for less friction and more durability\u003cbr\u003e\u003cbr\u003e\u003cimg src=\"\/dokument\/bibliotek\/Image\/MC2\/Bilder\/R21-M5-head-graphics-1000px.jpg\" width=\"250\" height=\"250\" alt=\"\"\u003e \u003cimg src=\"\/dokument\/bibliotek\/Image\/MC2\/Bilder\/R21-M5-cooling.jpg\" width=\"280\" height=\"253\" alt=\"\"\u003e\u003cbr\u003eNew M-Works water cooling head with larger volume\u003cbr\u003e\u003cbr\u003e\u003cimg src=\"\/bilder\/artiklar\/zoom\/OS0R21M05-24_13.jpg\" width=\"560\" height=\"560\" alt=\"\"\u003e\u003cbr\u003e\u003cbr\u003eCombustion chamber with smaller volume for lower nitro levels\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cimg src=\"\/dokument\/bibliotek\/Image\/MC2\/Loggor\/Minicars-Works-1000px.png\" width=\"560\" height=\"202\" alt=\"\"\u003e","brand":"M-WORKS","offers":[{"title":"Default Title","offer_id":43930746159182,"sku":"MW-R21M5","price":2789.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0610\/9672\/2510\/files\/MW-R21M5_S.jpg?v=1783291413","url":"https:\/\/fjernstyret.dk\/products\/m-works-mw-r21m5-osspeed-r21-m5-marine-engine","provider":"FjernstyretDK","version":"1.0","type":"link"}