Hit and Miss Engines, Retrol HM-01 7cc Horizontal Single Cylinder 4-Stroke Evaporative Water-Cooled Gasoline Engine with Authentic Sound & Motion for STEM Education & Science Demonstration

Specifications.Material: Metal.Brand: RETROL ENGINE.Form: KIT Version/ RTR Version.Displacement: 7CC.Cylinder: Horizontal Single Cylinder.Stroke: Four-stroke.Cylinder Diameter: 20mm.Stroke: 22mm.Cooling Method: Evaporative Water-cooling.Lubrication Method: Mixed Oil + Oil Cup Lubrication.Startup Method: Manual Startup.Ignition Method: CDI Ignition System (Not Include).Spark Plug Type: 1/4-32 Thread ME8 Spark Plug (Not Include).Fuel: Gasoline 92 or Above.Lubricant: 4-stroke Engine Oil (Mixed with Gasoline at a ratio of 1:25).Product Weight: 1800g.Package Weight: 2000g.Product Dimensions: 17 x 13 x 13cm.Package Dimensions: 20 x 20 x 20cm.Packing: Box.Ages: 15+Package Including.Engine Set *1.Instructions *1

• 🔩 Precision Metal Craftsmanship: The RETROL HM-01 engine model features a 304 stainless steel cast body, flywheels, and connecting rods, all CNC precision-machined. The crankshaft is high-carbon steel and hardened. Finished with electrophoretic red coating, it showcases exceptional durability and a realistic vintage agricultural look for lasting display
• 🔥 Authentic Hit-and-Miss Operation: This 7cc horizontal 4-stroke engine uses evaporative water cooling and mixed oil lubrication. The visible adjustable-flow main oil cup, new-style carburetor, and resonance exhaust pipe allow you to observe the full working cycle. Manually start the engine to hear its iconic sound and feel the mechanical rhythm—an excellent educational tool
• ⚡ Innovative Speed Control Mechanism: Equipped with a unique fast-slow switch gear, enabling super-slow idle or higher speed power output. The two large balanced flywheels with spring-loaded ball and split pulley ensure stable runs. This design greatly enhances playability, letting you explore different operating characteristics of a classic hit-and-miss engine
• 🎁 Perfect Gift for Collectors & Enthusiasts: Exquisitely modeled after antique farm machinery, this red engine model is a striking display piece for desk or cabinet. Ideal for mechanical hobbyists, model collectors, and STEM education. An unforgettable gift that combines historical charm with hands-on learning of internal combustion principles
• 📦 DIY KIT Version & Important Notes: This is a self-assembly kit. The package includes the engine set and instructions ONLY. Spark plug (1/4-32 ME8), CDI igniter, fuel tank, fuel pipe, and base are not included. Please purchase these necessary accessories separately to complete your working engine model. Ages 15+