RETROL & OKMO B03 1/4 Scale RTR Hit & Miss Engine Model
⏳ Pre-Order Deal
Product Information:
Material: Metal + Wood
Color: Green/Red
Model: B03
Configuration: Ready to Run (RTR)
Dimensions: 25.5 × 11.5 × 13 cm
Weight: 1650 g
Engine Type: Gasoline Internal Combustion Engine
Cylinder: Horizontal Single-Cylinder
Stroke: Four-Stroke
Displacement: 3.6 cc
Bore: 16.0 mm
Stroke: 19.0 mm
Speed: 500–3000 rpm
Starting Method: Manual / Electric Drill-Assisted Start
Cooling System: Evaporative Water Cooling
Lubrication System: Splash Lubrication (via oil-fuel mixture)
Lubrication Ratio: 25:1 to 30:1 (Gasoline to Oil)
Ignition System: Mechanically-Triggered Ignition (Igniter Included)
Spark Plug: 3/16-40 Imperial Thread (Spark Plug Included)
Starting Power Supply: 1 × 1.5V AA Battery (Battery Not Included)
Fuel: 92# Gasoline or Higher Recommended (Fuel Not Included)
Oil: 2T/4T 10W50 Engine Oil Recommended (Oil Not Included)
Product Features:
1. A Tribute to Century-Old "Hit-and-Miss" Agricultural Engines:
Inspired 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.
2. Ready to Run, Easy to Operate:
The 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.
3. Precision CNC All-Metal Construction – Collector-Grade Craftsmanship:
The 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.
4. An Ideal Desktop Collectible and Gift:
Compact 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.
5. An Educational Tool for Industrial Science:
More 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.
Recommended Age: 16+
Packaging: Color Box
Package Contents:
Engine (includes spark plug) x 1
Equipment Case x 1
Wooden Base x 1
Fuel Tank x 1
Fuel Line x 1
Drill-Powered Starter Rod x 1
Accessory Pack x 1
Instruction Manual x 1
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