{"id":151455,"date":"2025-03-10T10:48:29","date_gmt":"2025-03-10T08:48:29","guid":{"rendered":"https:\/\/rc-est.eu\/pood\/uncategorized\/o-s-speed-r21-m06-marine-engine\/"},"modified":"2026-04-01T22:48:43","modified_gmt":"2026-04-01T19:48:43","slug":"o-s-speed-r21-m06-marine-engine","status":"publish","type":"product","link":"https:\/\/rc-est.eu\/en\/shop\/nitro-equipment\/nitro-equipment-engines\/water\/o-s-speed-r21-m06-marine-engine\/","title":{"rendered":"O.S.SPEED R21-M06 Marine Engine"},"content":{"rendered":"<p>This is the new 2025-edition Minicars Marine Special Edition O.S.SPEED R21-M06 3.5cc long-stroke competition engine. The R21-M06 has a new piston &amp; liner, a new conrod, a new crankshaft &amp; a ceramic main ball bearing.<\/p>\n<p><strong>Features:<\/strong><\/p>\n<ul>\n<li><strong>New DLC coated &amp; balanced R21 Euro-II crankshaft with more timing<\/strong><\/li>\n<li><strong>New 9-port cylinder liner with 3-port exhaust<\/strong><\/li>\n<li><strong>New piston with 3 oil-grooves<\/strong><\/li>\n<li><strong>New Ceramic main ball bearing<\/strong><\/li>\n<li><strong>New Reinforced &#8220;R&#8221; conrod<\/strong><\/li>\n<li><strong>New RP6 Turbo plug (instead of RP7)<\/strong><\/li>\n<li>O.S.Speed developed black crankcase with Minicars Marine Laser Engraving<\/li>\n<li>Black anodized water cooling head with Minicars Marine Special Edition Laser Engraving<\/li>\n<li>Backplate with steel thrust plate for lower friction and increased durability<\/li>\n<li>No carb included &#8211; choose your own carburetor (15mm diameter neck)<\/li>\n<\/ul>\n<p><strong>Suitable for competition boats (experience level \u201dhigh\u201d):<\/strong><\/p>\n<ul>\n<li>Hydroplanes<\/li>\n<li>Offshore (with gear deduction)<\/li>\n<li>Endurance (with gear reduction)<\/li>\n<\/ul>\n<p><strong>Recommended fuel:<\/strong><\/p>\n<ul>\n<li><strong>Hydroplanes<\/strong>: 12% nitro fuel with 8% Klotz Original Techniplate + 8% Klotz Benol oil<\/li>\n<li><strong>Offshore<\/strong>: 12% nitro fuel with 8% Klotz Original Techniplate + 8% Klotz Benol oil<\/li>\n<li><strong>Endurance<\/strong>: 12% nitro fuel with 8% Klotz Original Techniplate + 8% Klotz Benol oil<\/li>\n<li><i>We don&#8217;t recommend running 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.<\/i><\/li>\n<\/ul>\n<p><strong>Optional parts:<\/strong><\/p>\n<ul>\n<li>O.S. Remote R\/C Needle (#<a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/rc-est.eu\/en\/shop\/nitro-equipment\/nitro-equipment-engines\/nitro-equipment-engines-spare-parts\/r-c-control-needle-valve-remote-inflight-set\/\">OS71703009<\/a>)<\/li>\n<li>M-Drive Remote R\/C Needle Base Left (Black) (#<a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/rc-est.eu\/en\/shop\/nitro-equipment\/nitro-equipment-engines\/nitro-equipment-engines-spare-parts\/needle-base-l-for-remote-r-c-needle\/\">MDM-NBL<\/a>)<\/li>\n<li>M-Drive Remote R\/C Needle Base Right (Gold) (#<a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/rc-est.eu\/en\/shop\/nitro-equipment\/nitro-equipment-engines\/nitro-equipment-engines-spare-parts\/needle-base-r-for-remote-r-c-needle\/\">MDM-NBR<\/a>)<\/li>\n<li>M-Drive Main NeedleDelete Adapter for all O.S. 3.5cc car slide carbs (#<a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/rc-est.eu\/en\/shop\/nitro-equipment\/nitro-equipment-engines\/nitro-equipment-engines-spare-parts\/fuel-inlet-adapter-r21-m5x0-5\/\">MDM-DDCF<\/a>)<\/li>\n<li>O.S. Fuel Inlet Nipple Set (#<a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/rc-est.eu\/en\/shop\/nitro-equipment\/nitro-equipment-engines\/nitro-equipment-engines-spare-parts\/universal-nipple-no-15\/\">OS22082950<\/a>)<\/li>\n<li>M-Drive Short Marine Direct Drive Flywheel (w\/o cone) (#<a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/rc-est.eu\/en\/shop\/nitro-equipment\/nitro-equipment-engines\/nitro-equipment-engines-spare-parts\/flywheel-r21-marine-direct-drive-short\/\">MDM-DDFW<\/a>)<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>This is the new 2025-edition Minicars Marine Special Edition O.S.SPEED R21-M06 3.5cc long-stroke competition engine. The R21-M06 has a new<\/p>\n","protected":false},"featured_media":152073,"template":"","meta":[],"product_brand":[],"product_cat":[874],"product_tag":[],"class_list":["post-151455","product","type-product","status-publish","has-post-thumbnail","product_cat-water","first","onbackorder","taxable","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>O.S.SPEED R21-M06 Marine Engine - RC-EST<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rc-est.eu\/en\/shop\/nitro-equipment\/nitro-equipment-engines\/water\/o-s-speed-r21-m06-marine-engine\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"O.S.SPEED R21-M06 Marine Engine - RC-EST\" \/>\n<meta property=\"og:description\" content=\"This is the new 2025-edition Minicars Marine Special Edition O.S.SPEED R21-M06 3.5cc long-stroke competition engine. The R21-M06 has a new\" \/>\n<meta property=\"og:url\" content=\"https:\/\/rc-est.eu\/en\/shop\/nitro-equipment\/nitro-equipment-engines\/water\/o-s-speed-r21-m06-marine-engine\/\" \/>\n<meta property=\"og:site_name\" content=\"RC-EST\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/rcest\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-01T19:48:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/rc-est.eu\/wp-content\/uploads\/2025\/03\/OS0R21M06-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/rc-est.eu\\\/en\\\/shop\\\/nitro-equipment\\\/nitro-equipment-engines\\\/water\\\/o-s-speed-r21-m06-marine-engine\\\/\",\"url\":\"https:\\\/\\\/rc-est.eu\\\/en\\\/shop\\\/nitro-equipment\\\/nitro-equipment-engines\\\/water\\\/o-s-speed-r21-m06-marine-engine\\\/\",\"name\":\"O.S.SPEED R21-M06 Marine Engine - 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