{"product_id":"retrol-okmo-b03-rtr-hit-and-miss-engine-model","title":"RETROL \u0026 OKMO B03 1\/4 Scale RTR Hit \u0026 Miss Engine Model","description":"\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal + Wood\u003cbr\u003e\u003cstrong\u003eColor: \u003c\/strong\u003eGreen\/Red\u003cbr\u003e\u003cstrong\u003eModel: \u003c\/strong\u003eB03\u003cbr\u003e\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Ready to Run (RTR)\u003cbr\u003e\u003cstrong\u003eDimensions: \u003c\/strong\u003e25.5 × 11.5 × 13 cm\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 1650 g\u003cbr\u003e\u003cstrong\u003eEngine Type:\u003c\/strong\u003e Gasoline Internal Combustion Engine\u003cbr\u003e\u003cstrong\u003eCylinder: \u003c\/strong\u003eHorizontal Single-Cylinder\u003cbr\u003e\u003cstrong\u003eStroke: \u003c\/strong\u003eFour-Stroke\u003cbr\u003e\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 3.6 cc\u003cbr\u003e\u003cstrong\u003eBore:\u003c\/strong\u003e 16.0 mm\u003cbr\u003e\u003cstrong\u003eStroke: \u003c\/strong\u003e19.0 mm\u003cbr\u003e\u003cstrong\u003eSpeed: \u003c\/strong\u003e500–3000 rpm\u003cbr\u003e\u003cstrong\u003eStarting Method: \u003c\/strong\u003eManual \/ Electric Drill-Assisted Start\u003cbr\u003e\u003cstrong\u003eCooling System: \u003c\/strong\u003eEvaporative Water Cooling\u003cbr\u003e\u003cstrong\u003eLubrication System: \u003c\/strong\u003eSplash Lubrication (via oil-fuel mixture)\u003cbr\u003e\u003cstrong\u003eLubrication Ratio: \u003c\/strong\u003e25:1 to 30:1 (Gasoline to Oil)\u003cbr\u003e\u003cstrong\u003eIgnition System:\u003c\/strong\u003e Mechanically-Triggered Ignition (Igniter Included)\u003cbr\u003e\u003cstrong\u003eSpark Plug:\u003c\/strong\u003e 3\/16-40 Imperial Thread (Spark Plug Included)\u003cbr\u003e\u003cstrong\u003eStarting Power Supply:\u003c\/strong\u003e 1 × 1.5V AA Battery (Battery Not Included)\u003cbr\u003e\u003cstrong\u003eFuel: \u003c\/strong\u003e92# Gasoline or Higher Recommended (Fuel Not Included)\u003cbr\u003e\u003cstrong\u003eOil: \u003c\/strong\u003e2T\/4T 10W50 Engine Oil Recommended (Oil Not Included)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Features:\u003c\/strong\u003e\u003cbr\u003e1. A Tribute to Century-Old \"Hit-and-Miss\" Agricultural Engines:\u003cbr\u003eInspired by the stationary farm engines produced by Amanco between 1910 and 1935—the primary power source for farms before the widespread adoption of electricity—this model features a functional centrifugal governor. It physically locks the exhaust valve to achieve a true \"hit-and-miss\" ignition cycle, replicating the iconic \"bang—coast—coast—bang\" rhythm. This is not a mere simulation, but an authentic experience of early industrial machinery history.\u003cbr\u003e2. Ready to Run, Easy to Operate:\u003cbr\u003eThe unit comes fully assembled (RTR), requiring no complex setup. It is equipped with a complete mechanical ignition system and supports both manual flywheel starting and electric drill-assisted starting. A solid wood base ensures stable operation. Simply add the battery, fuel, cooling water, and engine oil to experience the operation of a real four-stroke internal combustion engine—accessible to both beginners and seasoned enthusiasts.\u003cbr\u003e3. Precision CNC All-Metal Construction – Collector-Grade Craftsmanship:\u003cbr\u003eThe main body is precision-machined from aluminum alloy, complemented by brass components and a stainless steel flywheel. The mechanical structure faithfully replicates the original design, balancing a vintage aesthetic with robust durability—perfect for repeated operation or long-term static display.\u003cbr\u003e4. An Ideal Desktop Collectible and Gift:\u003cbr\u003eCompact in size, this model is well-suited for a study, workshop, office, or display cabinet. During operation, you can clearly observe the movement of the speed-regulating flyweights, valves, and the flywheel. Combining interactive play with static display, it serves as an excellent piece for mechanical enthusiasts, collectors of vintage engines, and history buffs—making it a unique and thoughtful gift.\u003cbr\u003e5. An Educational Tool for Industrial Science:\u003cbr\u003eMore than just a vintage ornament, this serves as an intuitive teaching model for internal combustion engines. Features such as evaporative water cooling, adjustable drip-feed lubrication, and mechanical contact-point ignition are fully exposed, allowing for a clear view of the \"hit-and-miss\" ignition cycle and the complete four-stroke operating logic. It provides insight into the speed regulation and power principles of early agricultural engines—an ideal introduction for those aged 16 and up, while also offering a nostalgic, hands-on experience for adults.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRecommended Age: \u003c\/strong\u003e16+\u003cbr\u003e\u003cstrong\u003ePackaging: \u003c\/strong\u003eColor Box\u003cbr\u003e\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e\u003cbr\u003eEngine (includes spark plug) x 1\u003cbr\u003eEquipment Case x 1\u003cbr\u003eWooden Base x 1\u003cbr\u003eFuel Tank x 1\u003cbr\u003eFuel Line x 1\u003cbr\u003eDrill-Powered Starter Rod x 1\u003cbr\u003eAccessory Pack x 1\u003cbr\u003eInstruction Manual x 1\u003c\/p\u003e","brand":"enginediyshop","offers":[{"title":"Red \/ Engine Only","offer_id":63398133104780,"sku":"3764517","price":499.99,"currency_code":"USD","in_stock":true},{"title":"Red \/ Engine+Frame","offer_id":63398133137548,"sku":"3764623","price":599.98,"currency_code":"USD","in_stock":true},{"title":"Green \/ Engine Only","offer_id":63398133170316,"sku":"3764518","price":499.99,"currency_code":"USD","in_stock":true},{"title":"Green \/ Engine+Frame","offer_id":63398133203084,"sku":"3764620","price":599.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0548\/8377\/8700\/files\/0b3c65ec-c327-434e-ae22-35a4ffd6d37b.jpg?v=1792490101","url":"https:\/\/www.enginediyshop.com\/en-au\/products\/retrol-okmo-b03-rtr-hit-and-miss-engine-model","provider":"enginediyshop","version":"1.0","type":"link"}