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

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Resonating Exhaust Pipe Design: One of the unique features of the RETROL HM-01 engine is the inclusion of a resonating exhaust pipe design. This design reproduces the exhaust sound and adds a unique aesthetic appeal. The sound can be heard when the engine operates at extremely low speeds, offering an immersive and realistic experience.

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

Quick-Slow Speed Switch: A specially designed feature rarely seen in other engines, the "quick-slow speed switch" allows users to switch between ultra-low speeds and high speeds for power output. This feature provides a greater sense of playability and control, offering a versatile experience for engine enthusiasts.

User-Friendly Carburetor Design: The novel carburetor design of the RETROL HM-01 engine makes it easier to adjust, particularly for beginners. This user-friendly feature simplifies the tuning process and enhances the overall usability of the engine.

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

Adjustable Main Oil Cup: The engine incorporates a transparent and adjustable main oil cup. This feature allows for precise lubrication, ensuring enhanced durability and a longer lifespan for the engine.

One flywheel is equipped with a spring-loaded ball design, while the other features a split-type wide-faced belt pulley, making the engine highly practical for power output.

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

Ignite your creative spirit and immerse yourself in the exhilarating joy of building with our captivating Hit and Miss DIY Kits. Order now to unlock endless fun and excitement as you craft and create unforgettable masterpieces!

FAQs

Customer Reviews

Based on 21 reviews
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(19)
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E
ELECTRAGLIDE1976
brenann torpedo model with HM01

This is a working model of the torpedo invented by Louis Brennan in 1877 and fitted with the HM01 retrol motor.

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M
Mike P.
Great little engine

My first hit & miss engine - impressed! I'm total novice. I picked up the RTR version and it started first time. Mounted in on a base and added the generator from my previous order of a RETROL SE-02 DIY Horizontal Mill Steam Engine Boiler Model Kits with Generator Streetlight. See image. I added a capacitor to the generator connection to minimize flickering at low speeds of a led strip-light at the front of the base plate.

R
Robert Davison
A couple hints....

Very nice H&M model! Very nicely machined and finished with the exception of the counterweights of the crank. Sort of hidden so not a huge deal. Not a perfect casting, so some voids are visible. I don't see any other issues in the machined areas.
The tapered brass inserts that hold the flywheels in place don't have Jack crews for releasing their grip. If you tighten them and haven't adjusted placement/orientation of the counterweights of the flywheels you're in for a headache. I backed off the screws 1 turn and gently tapped each until I could rotate flywheels on the shaft (Not ideal for tiny screw threads). I should have wrapped a piece of guitar string or a thin paperclip (paperclip probably too much, someone suggested a razor blade, but hope you get the idea) between the brass inserts and flywheels to maintain a gap to allow adjusting. Once everything is where it needs to be, remove this shimming material and tighten the 3 screws.
Alternatively, one could predrill these and cut threads for Jackscrews (Joe Pie's YouTube credit here).

Tracking the shipping in the US is kind of scary. The tracking info is originally all in Chinese. Eventually (if you dig enough) you can find a USPS tracking #. It's still scary until USPS (can be scary too) is in possession of the package. I ordered the complete kit and in a week it was to all to me. Packaged securely, 3 separate boxed items with no damages on arrival, to Massachusetts.

Haven't run this yet. I do get spark, but unsure if the three 9v batteries are sufficient.

All in all this is a really nice kit and I'm glad I spent the extra $$$ for the Retrol/Musa brand. Oh, and thanks to Sterlingkit! I recommend them highly!!

D
Desmond Hill
Great looking engine

This is my first model engine, and I was a little sceptical on spending that much money especially with the exchange rate, and wondering if it would actually arrive. But I must say that Stirlingkit did a great job in making the process go smoothly. The well wrapped package arrived earlier than expected with no damage. On opening the package I found everything well packaged in foam cutouts and all smaller items in well labelled plastic bags.
One problem was found, the plastic ignition trigger assembly was broken in half with springs exposed. (disappointed). But a email and photo to Stirlingkit and next morning I had a response from Martin explaining it was a known fault and a revised replacement part was sent. Big thanks to Martin at Stirlingkit.
I made my own engine stand, ignition and battery box, and small fuel tank.
I’ve had the engine running, but it will not run at slow speed, I will have to work on retarding the ignition timing. A work in progress hopefully with good results. The engine is well made and goes together easily.

A
Anonymous
HM-01 made into a portable engine.

I immensely enjoyed assembling the MUSA RETROL HM-01 7cc, Model KIT which was easily accomplished. After I got it built, I needed to do more, like making it into a portable engine. I found the right wheels for the look wanted and fabricated the running gear. Adding a choice wood tray from Hobby Lobby finished off the display. Overall, a “GREAT” model from Stirling kit added to the collection. THANKS. **PS: Still looking for a functional model Windmill, and a side shaft cam stopper model.