The Most Common Problems on RETROL HM-01 Model Hit and Miss Engine? | Stirlingkit

Answer: The Musa hm01 engine is known for its meticulous design, high-quality craftsmanship, and attention to detail.

How does the Musa hm01 compare to other hit and miss engines in terms of quality?

Answer: According to Thomas, the Musa hm01 stands out as one of the best hit and miss engine models to come out of China. He specifically praised its quality and scale accuracy.

What adjustments can be made to fine-tune the Musa HM-01's performance during assembly?

Answer: You can adjust the needle valve for the fuel mixture and there is a clever trick to slightly slow down the engine without changing the spring tension by adjusting the governor linkage. These adjustments are demonstrated in the below video by YouTuber Thomas.

What operational features does the Musa HM-01 engine have?

Answer: The Musa HM-01 engine features operational details such as a working Hit-and-Miss oiler, a counterweight in the casting, and other components that contribute to its functionality and scale accuracy.

How does the Musa HM-01 engine differ from other models in terms of construction materials?

Answer: The Musa HM-01 engine utilizes steel components in critical areas, contributing to its overall quality. For example, the connecting rod is made of steel, unlike other engines with aluminum or brass components.

Can I get the engine in a different color?

Answer: The engine is currently only available in the red color as shown in the promotional images.

Is there a difference between the KIT and ASSEMBLED versions?

Answer: The KIT version requires assembly, while the ASSEMBLED version is ready to use.

Does the engine support alternative fuel types?

Answer: The engine is designed for use with gasoline rated 92# and above.

Are there additional accessories available for purchase?

Answer: Accessories like spark plugs, CDI ignition, fuel tank, fuel lines, base, and equipment wooden box are not included with the standard engine option, but these can be purchased separately.

How is the engine cooled, and what is the cooling method?

Answer: The engine uses an evaporative water-cooling system.

What is the recommended fuel-to-oil ratio for lubrication?

Answer: Mix four-stroke engine oil with gasoline at a 1:25 ratio.

How is the engine manually started?

Answer: The engine is started manually by winding a pull cord around the pulley attached to the flywheel. A firm, even pull of the cord gives the engine the initial momentum to start up. It is normal to sometimes need a few tries to get the engine to start due to a variety of factors.

Can the spark plug be replaced, and what type is used?

Answer: Yes, it can be replaced with an ME-8 type spark plug with 1/4-32 threads.

What are the dimensions of the engine?

Answer: The engine dimensions are approximately 17x13x13cm.

Is there a detailed assembly manual included?

Answer: Yes, an assembly manual is included with the engine.

Is the engine suitable for indoor use?

Answer: Yes, the engine can be used indoors. Generally, we recommend using it outdoors to avoid exhaust fume buildup which can be potentially hazardous. Make sure to use it in well-ventilated areas to prevent the buildup of these fumes.

What is the average runtime of the HM-01 engine?

Answer: The average runtime varies based on usage, but it generally runs for a reasonable enough time to demonstrate operation.

How do I maintain and clean the engine?

Answer: Follow the maintenance guidelines provided in the manual for cleaning and care.

Are there specific storage recommendations for the engine?

Answer: Store the engine in a cool, dry place when not in use. Instructions are included in the manual for proper storage procedures following operation, including draining oil and fuel from the machine, proper cleaning before storage, and recommended storage environment.

Is there a warranty policy for the engine?

Answer: Refer to our warranty policy for details on coverage.

Is the engine suitable for beginners or individuals aged 14 and above?

Answer: Yes, it is recommended for individuals aged 14 and above.

Does the engine have a display stand for showcasing?

Answer: Display stands are not included with the standard engine option but can be purchased separately.

Does the engine support express shipping?

Answer: Yes, express shipping options are available.

What makes the engine a collectible item?

Answer: The engine features meticulous craftsmanship, Ferrari red paint, and stainless steel 304 components, making it both a functional model and a collectible piece.

Can I purchase additional parts like a base or a wooden box for the engine?

Answer: Yes, additional parts like a base or a wooden box can be purchased separately.

How is the engine's noise and motion designed for a realistic experience?

Answer: The engine is designed to produce realistic sound and motion to mimic full-scale engine operation, enhancing the overall experience.

Are there any special safety considerations for operating the engine?

Answer: Yes, please follow the safety instructions provided in the manual when operating the engine.

Can the engine be used as an educational tool?

Answer: Yes, the engine properly serves as an educational tool, allowing users to observe the working principles of a Hit-and-Miss engine.

How is the engine's durability and reliability ensured?

Answer: The engine is crafted with high-quality materials and precision engineering to ensure reliability and durability. Care and cleaning instructions are included in the manual and are recommended to be followed strictly for optimal performance and lasting durability.

Is there an online community or forum for discussing the engine?

Answer: Yes, an online community is available for enthusiasts to share experiences and tips related to the engine.

Can the engine be shipped internationally?

Answer: Yes, international shipping options are provided for the engine.

How can I contact customer support for inquiries or assistance?

Answer: Customer support can be contacted through our official website or the provided contact information in the user manual.

what should the carburator be set at for the first start?

When starting the engine for the first time, tighten the main oil needle and then back it out two turns. After starting, listen to the sound. A dull sound indicates rich oil. Turn down the sound at this time. A sharp sound indicates lean oil. Open the oil needle larger. The speed adjustment process cooperates with the damper.

What's These UNEXPLAINED EXTRA PARTS of HM-01 engine?

Extra bag labeled, "Machine Screw 3*6" containing what appears to be qty=2 set screws of unknown size - not machine screws as labeled - these screw sizes are not identified on the BOM or drawing detail. See photo for detail.
>>Please identify their use? Are these substituted different sizes for the above missing part # 039, M3*4 set screws?

Extra bag labeled "screw 2.5*6" containing qty=6 screws not identified on the BOM or drawing detail. See photo for detail.
>>Please identify their use? Are these BOM # 037 and why different than the below bag of what I assume is also BOM # 037?

Extra bag labeled "screw (new) 2.5*6" containing qty=6 screws not identified on the BOM or drawing detail. See photo for detail.
>>Please identify their use? Are these BOM # 037 and why different than the above bag of what I assume is also BOM # 037?

Extra bag unlabeled containing qty=1 rod not identified on the BOM or drawing detail. See photo for detail. Is this a gap measuring/setting rod as noted on page 28 of the manual for checking for a 1.6-1.7 mm gap?
>>Please identify/confirm its use?

There is an unidentified wiring harness found in the ignition parts pack that is not identified on the electrical schematic or any information.
See attached photo. Note the ends of all three conductors were sealed together on the end opposite the t-connector.

11. Could you help please. What is the easiest way to get the tapered collet and wheel off the drive shaft. I forgot to put the steel balls in the key way. Or will it be ok without them in

12. i ordered and received a retrol hm-01 hit and miss motor. upon opening the box i noticed that the speed controle lever was not attached to the motor, there was a spring and black mount attached to the lever. i can not find any instructions on how to install the lever. the wiring and plug seem to be in good shape. can you please point me in the correct direction to get this resolved. i can send pictures of the speed control lever if needed

13. Why doeshm-01 have a battery? Does it not use a flame source to heat the water? If it’s using electric power it’s technically a motor not an engine LOL.

The battery is used to power the igniter. The igniter is an electronic igniter.

3 Modifications done so far on the HM-01 hit and miss engine:

1). Ignition timing has been retarded bringing ignition closer to TDC - this helped allow for much slower running speed from stock and has greatly reduce kickback at slow cranking speed.

2). Softer spring for governor mechanism - allows for slower speed running.

3). Softer push rod spring - to reduce the frictional loading on the engine so slower speed operation can be maintained.