{"product_id":"retrol-okmo-b03-miniature-4-stroke-hit-and-miss-gasoline-engine-model-rtr","title":"RETROL \u0026 OKMO B03 Miniature 4-Stroke Hit and Miss Gasoline Engine Model RTR","description":"\u003cp\u003e\u003cstrong\u003eRETROL \u0026amp; OKMO B03 Miniature 4-Stroke Hit and Miss Gasoline Engine Model RTR (Red\/Green)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCentury-Old Intermittent Firing Heritage: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBased on 1910–1935 Amanco farm stationary engines, this model features a working centrifugal governor that physically latches the exhaust valve to produce a genuine hit-and-miss firing cycle. It replicates the iconic \"pulse-idle-idle-pulse\" firing pattern, offering a true mechanical experience rather than a simulated effect.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReady-to-Run Design with Easy Setup: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSupplied as a pre-assembled RTR unit, it requires no complex assembly. It includes a complete mechanical ignition system and supports manual flywheel starting or drill-assisted starting. The wooden base ensures stable operation. Just add a battery, fuel, cooling water, and oil to experience real four-stroke engine operation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCNC-Machined All-Metal Craftsmanship: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe main body features precision CNC-machined aluminum alloy, paired with brass fittings and a stainless steel flywheel. The mechanical structure fully restores the classic structure, combining a vintage appearance with longevity for both repeated operation and long-term static display.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDesktop Collectible and Display Piece: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCompact in size, it fits well in studies, workshops, offices, and display cabinets. During operation, the centrifugal flyweights, valves, and flywheel movements are visible. It serves both as an interactive model and a static display, making it a standout collectible for mechanical enthusiasts, vintage engine collectors, and history fans.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEducational Industrial Science Model: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMore than a vintage ornament, it is an intuitive teaching model for internal combustion engines. The evaporative water cooling, adjustable drip lubrication, and mechanical touch ignition are all exposed, allowing direct observation of the complete Hit-and-Miss four-stroke working logic. Suitable for mechanical interest education for ages 16 and up.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e.Material: Metal + Wood\u003cbr\u003e.Color: Red\/Green\u003cbr\u003e.Model: B03\u003cbr\u003e.Form: Ready to Run (RTR)\u003cbr\u003e.Engine Type: Gasoline Internal Combustion Engine\u003cbr\u003e.Cylinder: Horizontal Single Cylinder\u003cbr\u003e.Stroke: Four-Stroke\u003cbr\u003e.Displacement: 3.6 cc\u003cbr\u003e.Bore: 16.0 mm\u003cbr\u003e.Stroke Length: 19.0 mm\u003cbr\u003e.RPM Range: 500–3000 rpm\u003cbr\u003e.Starting Method: Manual \/ Drill Start\u003cbr\u003e.Cooling Method: Evaporative Water Cooling\u003cbr\u003e.Lubrication Method: Mixed-Fuel Splash Lubrication\u003cbr\u003e.Lubrication Ratio: Gasoline \/ Oil 25:1 to 30:1\u003cbr\u003e.Ignition Method: Mechanical Trigger-Controlled Ignition (Igniter Included)\u003cbr\u003e.Spark Plug: Imperial Thread 3\/16-40 (Spark Plug Included)\u003cbr\u003e.Starting Power: 1.5V AA Battery × 1 (Battery Not Included)\u003cbr\u003e.Fuel: 92# Gasoline or Higher Recommended (Fuel Not Included)\u003cbr\u003e.Engine Oil: 2T\/4T 10W50 Engine Oil Recommended (Lubricating Oil Not Included)\u003cbr\u003e.Product Weight: 1650g\u003cbr\u003e.Package Weight: 1750g\u003cbr\u003e.Product Dimensions: 22.5 x 11.5 x 13cm\u003cbr\u003e.Package Dimensions: 27 x 16 x 18cm\u003cbr\u003e.Packaging: Graphic Carton\u003cbr\u003e.Age: 16+\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePacking List:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e.Engine (with Spark Plug) *1\u003cbr\u003e.Equipment Box *1\u003cbr\u003e.Wooden Base *1\u003cbr\u003e.Fuel Tank *1\u003cbr\u003e.Fuel Line *1\u003cbr\u003e.Drill Starting Shaft *1\u003cbr\u003e.Accessory Kit *1\u003cbr\u003e.Instruction Manual *1\u003c\/p\u003e","brand":"enginediy","offers":[{"title":"Engine Only(Red)","offer_id":67651093201110,"sku":"33ED3764517","price":499.99,"currency_code":"USD","in_stock":true},{"title":"Engine Only(Green)","offer_id":67651093233878,"sku":"33ED3764518","price":499.99,"currency_code":"USD","in_stock":true},{"title":"All Set(Engine+Cart)Red","offer_id":67651093266646,"sku":"33ED3764623","price":599.98,"currency_code":"USD","in_stock":true},{"title":"All Set(Engine+Cart)Green","offer_id":67651093299414,"sku":"33ED3764620","price":599.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0175\/0718\/8800\/files\/retrol-okmo-b03-miniature-4-stroke-hit-and-miss-gasoline-engine-model-rtr.jpg?v=1792489422","url":"https:\/\/www.enginediy.com\/de\/products\/retrol-okmo-b03-miniature-4-stroke-hit-and-miss-gasoline-engine-model-rtr","provider":"EngineDIY","version":"1.0","type":"link"}