{"product_id":"retrol-okmo-b04-hit-miss-gas-engine-model","title":"RETROL \u0026 OKMO B04 1\/4 Scale Hit \u0026 Miss Gas Engine Model","description":"\u003cp\u003eProduct Information\u003cbr\u003eModel: B04\u003cbr\u003eCondition: Ready to Run (RTR)\u003cbr\u003eMaterial: Aluminum alloy with a solid wood base\u003cbr\u003e\u003cspan class=\"HwtZe\" lang=\"en\"\u003e\u003cspan class=\"jCAhz ChMk0b\"\u003e\u003cspan class=\"ryNqvb\"\u003eColor: Green\/Red\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003eOverall Dimensions: 225 × 115 × 130 mm\u003cbr\u003eEngine Type: Horizontal single-cylinder, four-stroke gasoline internal combustion engine\u003cbr\u003eDisplacement: 3.6cc\u003cbr\u003eBore: 16.0 mm\u003cbr\u003eStroke: 19.0 mm\u003cbr\u003eSpeed Regulation: Hit-and-Miss mechanism\u003cbr\u003eRotational Speed: 500–3000 rpm\u003cbr\u003ePower: Approx. 0.2 hp\u003cbr\u003eStarting Method: Manual (spinning the flywheel) or electric drill-assisted start\u003cbr\u003eCooling System: Air-cooled\u003cbr\u003eLubrication: Splash lubrication (using an oil-fuel mixture)\u003cbr\u003eFuel-to-Oil Ratio: 25:1 to 30:1\u003cbr\u003eIgnition System: Mechanical contact-triggered ignition\u003cbr\u003ePower Source for Ignition: 1 × 1.5V AA battery (not included)\u003cbr\u003eFuel: 92#\/95# or higher unleaded gasoline (not included)\u003cbr\u003eEngine Oil: 2T\/4T 10W50 oil recommended (not included)\u003c\/p\u003e\n\u003cp\u003eProduct Features:\u003cbr\u003e1. A faithful reproduction of a century-old Amanco air-cooled agricultural engine, featuring the classic \"hit-and-miss\" intermittent operation.\u003cbr\u003eThis model replicates the American Amanco agricultural engines from the 1910s–1930s—specifically the air-cooled \"Chore Boy\" variant designed for environments with limited water access. It utilizes a centrifugal governor to achieve an intermittent cycle of \"firing\/power stroke\" followed by \"coasting\/idling,\" producing a distinctive \"pop—coasting\" sound—an authentic recreation of the primary power source used on farms before the widespread availability of electricity.\u003cbr\u003e2. Comes fully assembled and pre-tuned (RTR); features dual starting modes, making it easy for beginners to operate. The unit comes fully pre-assembled—no sanding or assembly required. It supports two starting methods: manual (via the flywheel) or assisted (using an electric drill). A sturdy solid-wood base minimizes vibration during operation. Once the oil-drip lubrication and fuel-air mixture are properly adjusted, the engine can be started in just minutes, allowing both beginners and seasoned enthusiasts to quickly enjoy the experience of a running machine.\u003cbr\u003e3. Exposed CNC-machined aluminum alloy mechanical structure—fully open for observation and maintenance.\u003cbr\u003ePrecision-machined from aluminum alloy using CNC technology, the engine features an exposed open-crankshaft design. It utilizes a mechanical contact-point ignition system with no sealed electronic components; every part is visible, accessible, and easy to maintain. Equipped with a stainless-steel spoked flywheel and a brass fan, the design stays true to the original agricultural machinery, balancing durability for hands-on play with the premium quality expected of a collectible.\u003cbr\u003e4. Perfect for both static display and dynamic operation—a high-end mechanical collectible and gift.\u003cbr\u003eFinished in a classic \"agricultural green\" that replicates the original factory color scheme, this model adds a distinct mechanical aesthetic to any study, workshop, or office display cabinet. It can be operated to showcase its intermittent ignition cycle or kept as a static display piece. It is an ideal desktop collectible for antique engine enthusiasts and mechanical model hobbyists, as well as a unique, high-end gift.\u003cbr\u003e5. An intuitive educational tool for demonstrating internal combustion engine speed regulation.\u003cbr\u003eWith its fully exposed mechanical linkage, the model allows for clear observation of the centrifugal governor, valve actuation, and contact-point ignition. It provides an intuitive understanding of the engineering logic behind \"hit-and-miss\" (intermittent) speed regulation. It serves as an excellent tool for sparking an interest in mechanics among younger generations, while also satisfying the nostalgic curiosity of adults interested in vintage stationary engines.\u003c\/p\u003e\n\u003cp\u003eRecommended Age: 16+\u003cbr\u003ePackaging: Color box\u003cbr\u003ePackage Contents:\u003cbr\u003eEngine unit × 1\u003cbr\u003eElectronic control box × 1\u003cbr\u003eSolid-wood base × 1\u003cbr\u003eFuel tank × 1\u003cbr\u003eFuel line × 1\u003cbr\u003eElectric drill starter rod × 1\u003cbr\u003eSpare parts kit × 1\u003cbr\u003eInstruction manual × 1\u003c\/p\u003e","brand":"enginediyshop","offers":[{"title":"Red \/ Engine Only","offer_id":63398324437132,"sku":"3764515","price":519.99,"currency_code":"USD","in_stock":true},{"title":"Red \/ Engine+Frame","offer_id":63398324469900,"sku":"3764646","price":619.98,"currency_code":"USD","in_stock":true},{"title":"Green \/ Engine Only","offer_id":63398324502668,"sku":"3764516","price":519.99,"currency_code":"USD","in_stock":true},{"title":"Green \/ Engine+Frame","offer_id":63398324535436,"sku":"3764632","price":619.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0548\/8377\/8700\/files\/6d6c64f2-8d5f-39a0-57a5-897f95f5ce83.jpg?v=1792490948","url":"https:\/\/www.enginediyshop.com\/de-de\/products\/retrol-okmo-b04-hit-miss-gas-engine-model","provider":"enginediyshop","version":"1.0","type":"link"}