After running the RETROL 1140 engine for nearly 6 hours, I'd like to share some practical usage tips with you.
1. Engine Oil
Oil Selection
Highly recommend using high - quality synthetic two - stroke engine oil, such as Motul 710. This oil has excellent protective properties. Since it doesn't burn completely in the combustion chamber, the returned oil can be effectively filtered through the oil filter to continuously protect the key components of the engine. The small amount of oil that enters the combustion chamber not only burns cleanly but also lubricates the valves. In contrast, ordinary engine oil will produce carbon deposits when burned, so it is not recommended.
Oil Level Monitoring
During the initial use of 3 - 4 fuel tanks, be sure to pay close attention to the oil level to ensure that it does not drop below the minimum level, which is below the oil pump pipe. Ideally, the oil should completely submerge the relevant components. When the flywheel is rotated and the big end of the piston descends, it should just gently touch the oil surface (rather than being completely submerged).
Fuel Selection
I choose straight camp fuel as the fuel because it burns cleanly and has a lower octane number than gasoline, making combustion easier.
2. Spark Plug
Cleaning Cycle
One of the advantages of not having to mix oil with fuel is that the cleaning cycle of the spark plug is extended. However, it is still recommended to remove and clean the spark plug after every 2 full fuel tanks. If the spark plug is not cleaned for a long time, it will eventually be fouled, resulting in incomplete combustion and the formation of deposits inside the combustion chamber.
Installation Key Points
When reinstalling the spark plug, make sure to fully tighten it without damaging the O - ring to ensure good compression performance of the engine.
3. Running - in Period
RPM Control
After receiving the engine, special attention should be paid during the running - in period, especially since this engine uses regular piston rings and oil supply/scraper rings. When using the first fuel tank, keep the engine speed at the lowest level as much as possible. It is recommended to make the air - fuel mixture a little richer, which helps with engine cooling and also facilitates the correct bedding - in of the piston rings. If the engine runs at a high speed during the running - in period, the piston rings may become loose, leading to problems such as excessive oil consumption or accumulation in the combustion chamber.
Thermal Cycling Operation
When starting the engine for the first time, it is highly recommended to perform the correct metal thermal cycling operation. Run the engine for 2 minutes each time, for a total of 3 times, and let the engine cool down completely after each run.
4. Ignition Timing
For the purpose of making the engine run a little slower and avoiding high - speed operation, I pulled the Hall sensor cable outwards by 2 mm to moderately retard the ignition timing. This makes the ignition time closer to the top dead center, achieving a good balance between low - speed operation and full combustion under low - speed and rich - mixture conditions, while minimizing the starting impact. This operation is not necessary, just a personal preference.
5. Operating Temperature and Coolant
Pre - heating Precautions
This engine takes a certain amount of time to fully pre - heat. Therefore, when the engine is cold or at room temperature, avoid running it at high speeds. Otherwise, due to the incorrect expansion of components, excessive oil will accumulate in the combustion chamber and at the exhaust port. Usually, before a cold start, if the engine has been standing for a while, there will be a small puff of smoke when starting (I personally quite like this phenomenon), but the smoke will dissipate after 10 seconds. The advantage of using Motul 710 oil is that even if there is smoke or a small amount of oil sprayed during operation, no carbon deposits will be generated. The sprayed substances are actually a mixture of water from complete combustion and normal lubricating oil.
Coolant Usage Suggestions
It is not recommended to use coolant or water within the first 3 minutes of engine operation. This allows the seals and piston rings to be properly bedded - in by heat before the coolant or water is introduced.
6. Oil Filter Cleaning
It is highly recommended to remove and clean the oil filter after using the first fuel tank (for specific operations, refer to my previous post), and then clean it every 3 fuel tanks. When cleaning, simply use kitchen paper towels and a small amount of alcohol to thoroughly clean it, and then dry it. When reinstalling the filter into the filter cover, add some oil, tighten it, and check for any leaks.
7. Judging the Engine's Running State
Sound
A normal - running RETROL 1140 engine should produce a smooth, consistent sound. Any knocking, rattling, or hissing noises could indicate problems. For example, a knocking sound might suggest issues with the combustion process, such as incorrect ignition timing or problems with the fuel - air mixture. A rattling sound could be a sign of loose components, like a loose piston ring. A hissing sound may point to air leaks in the intake or exhaust system.
Exhaust Gas
The color and smell of the exhaust gas can tell a lot about the engine's condition. With Motul 710 oil, the exhaust should be relatively clean. If you notice black smoke, it could mean the engine is running too rich, with too much fuel in the air - fuel mixture. White smoke might indicate coolant leakage into the combustion chamber, which could be due to a damaged head gasket. A strong, unusual smell in the exhaust could also be a sign of problems, such as unburned fuel or oil burning.
Vibration
A properly functioning engine should have minimal vibration. Excessive vibration can be a sign of engine imbalance, which could be caused by issues like a bent crankshaft, unevenly worn piston rings, or problems with the flywheel. If the engine vibrates strongly, especially at certain speeds, it's important to investigate further.
Temperature
Monitoring the engine's temperature is crucial. The RETROL 1140 engine takes time to warm up, but once it reaches its normal operating temperature, it should stay within a stable range. If the engine overheats, it could be due to problems with the cooling system, such as a lack of coolant (if it's a water - cooled engine), a malfunctioning water pump, or a blocked radiator. On the other hand, if the engine runs too cool, it may indicate a problem with the thermostat.
Performance
The engine's performance is also a key indicator. If the engine has a loss of power, struggles to start, or has inconsistent acceleration, these are all signs that something may be wrong. A loss of power could be caused by a variety of issues, including problems with the fuel supply, air intake, or ignition system. Difficulty starting might be due to a weak battery, a faulty starter motor, or issues with the fuel or ignition system.
Hope these tips can help your RETROL 1140 engine always maintain the best condition.
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