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RETROL HM-01 7cc Model Hit and Miss 4-stroke Horizontal Internal Combustion Engine - RETROL 4-Stroke & Inline Engines
RETROL

RETROL HM-01 7cc Model Hit and Miss 4-stroke Horizontal Internal Combustion Engine

★★★★★
4.83 / 5.0 (30 verified reviews)
$389.99 USD

Engineering Summary

The RETROL HM-01 7cc Model Hit and Miss 4-stroke Horizontal Internal Combustion Engine is a 7CC 4-Stroke & Inline Engine precision-engineered by RETROL. Features construction machined from metal and operating on Gasoline 92# or Above. Available for $389.99 USD with free worldwide tracked shipping, 30-day returns, and replacement parts support at Stirlingkit.

✓ Free Worldwide Shipping: Tracked air delivery in 5–14 business days.
✓ Missing Parts Guarantee: Free replacement parts dispatched within 7 days.
✓ 30-Day Risk-Free Returns: Full refund on unbuilt kits in original box.

Technical Specifications

21 Verified Parameters
Material Metal
Brand RETROL ENGINE
Form KIT Version/ RTR Version
Color Racing Red hit and miss enigne
Displacement 7CC
Cylinder Horizontal Single Cylinder
Stroke 22mm
Cylinder Diameter 20mm
Cooling Method Evaporative Water-cooling
Lubrication Method Mixed Oil + Oil Cup Lubrication
Startup Method Manual Startup
Ignition Method CDI Ignition System
Spark Plug Type 1/4-32 Thread ME8 Spark Plug
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 14+

Features, Architecture & Package Contents

RETROL HM-01 7cc Model Hit and Miss 4-stroke Horizontal Internal Combustion Engine 

Features:

  • .Exquisite Manufacturing Process: Precision-made from high-grade metal materials to ensure quality and accuracy. Each component is meticulously processed and integrated, resulting in an extremely realistic and appealing toy.
  • .Elegant Details: This well-crafted model is painted red to represent the appearance of an ancient agricultural machine, with genuine sound and movement that convey a retro and classic appeal, creating a lasting impression on the viewer.
  • .Easy to Display and Operate: Featuring a simple and easy-to-understand operation and display method, allowing you to easily control its operation by manually starting and stopping the engine or to display in any location, such as a desk or display cabinet.
  • .Realistic Principle: Perfect as a great tool for education and learning to understand the working principle and mechanical principles of the Hit-and-Miss engine. You can observe it ignite the fuel and produce a unique sound and movement when starting.
  • .Handsome Gift: Suitable for mechanical enthusiasts, collectors, and anyone interested in mechanical principles as a decorative item and a valuable collectible. Ideal for an unforgettable gift for stationary engine model collectors.
  • .Background Introduction:
  • The RETROL team spent 4 months creating and designing this brand new H&M engine model, designated as "HM-01." Adopt carefully selected high-quality materials and exquisite craftsmanship to assure the engine's dependability and longevity. With a visible adjustable-flow main oil cup, a new-style carburetor, and a resonance exhaust pipe. The engine has a practical power output because the 2 enormous flywheels are perfectly balanced and equipped with a spring-loaded ball and a split widen pulley. A one-of-a-kind "fast-slow switch gear" has been specially built to fulfill the requirements of engine speed switching at super-slow speeds or high speeds for power output, providing users with increased playability and operational experience. In terms of craftsmanship, the entire model is treated with electrophoretic surface treatment in red, and the main components (body, flywheel, connecting rod, etc.) are cast in 304 stainless steel. All assembly surfaces are CNC precision processed, and the crankshaft is made of high-carbon steel and hardened. This is not only a playable engine model but also a highly collectible mechanical artwork.
  • .Notes: the RETROL HM-01 engine typically includes the engine itself. However, it does not include a fuel tank, base, or equipment wooden box,a spark plug, and a CDI igniter(will be released later). These additional items would need to be sourced separately to complete the setup and display of the engine.


Specifications:

.Material: Metal
.Brand: RETROL ENGINE
.Form: KIT Version/ RTR Version

Color: Racing Red hit and miss enigne
.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
.Spark Plug Type: 1/4-32 Thread ME8 Spark Plug
.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: 14+

Verified Builder Reviews (30)

Authentic feedback from hobbyists, machinists, and scale model engineers

4.83 / 5.0
★★★★★ (30 total)
Dennis Eckert Verified Buyer
★★★★★

High Quality Engine Kit

The HM-01 hit n miss engine kit is very well designed and manufactured. The kit went together easily and ran well on the first start up.

dan Steiner Verified Buyer
★★★★★

Hit and Miss HM-01

All I can say is this is a sweet Hit and Miss engine. Assembly was straight forward. Fit and finish is good. It starts and runs quite well. Had a small issue with the ignition module (CDI). It crapped out, but that happens sometimes with new electronic components. Stirlingkit is sending a replacement.

John C. Davis Verified Buyer
★★★★★

Retrol HM-01 Hit & Miss

This review is coming to you from my experience with the full size antique engines such as hit & miss and also as a machinist for a major defense company for the past 40 years who now is retired & machines & builds scale model engines as a hobby. Also been known to purchase some of the great chinese model offered by Stirling Kit. The Retrol HM-01 is just another great example that Retrol & Stirling kit have designed, machined & built. Exceptional workmanship. Great price & fast shipping service from their US warehouse. My only complaint would be the same as a few other reviews have mentioned is that the ignition timing should have been adjustable by way of a screw. Trying to bend the points tab is a pain in the butt & not very precise. Some people were adjusting the valve timing on the gears in order to change the spark timing & this is not the correct way to adjust the spark timing. So a big thank you to Stirling kit & Retrol for producing the HM-01 engine.

Customer tim skotek Verified Buyer
★★★★★

I love it Thank You

hit/miss engine

Mike Verified Buyer
★★★★★

RETROL HM-01 hit and miss engine

Everything went together smothly and without troubles. The instructions are just pictures but found a youtube video that showed all steps. You do need to get your own battery to hook up for the ignition. They say a 9 volt should work. have not hooked it up yet. everything looks really nice.

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