Item Name: M25 Mini Engine
Dimensions: 135 × 85 × 80 mm
Displacement: 1.6 cc
Cylinder Diameter: 13 mm
Stroke: 12 mm
Weight: 990 g
The M25 is a mini gasoline engine model based on an ancient engine structure. All parts are independently designed and manufactured, using brass and stainless steel materials. The engine adopts a water-cooling heat dissipation structure.
A double flywheel design is used to reduce low-speed response issues common to ancient engine structures. The engine is equipped with a belt-type oil system for adjustable speed and a throttle switch that can be linked to control engine speed. The igniter operates on a 4.5V power supply.
The engine uses gasoline as fuel. Once started, it operates as a powerful miniature mechanical engine.
External force (high-speed electric drill)
Manual starting
Starting can be performed either by an electric drill or manually.
Check the engine wiring from the circuit board, connect the fuel tank pipeline, and install 3 AA batteries (4.5V).
Turn on the power switch and quickly rotate the flywheel on the right side of the engine to start it.
During startup, lightly cover the air intake with your hand and then immediately release it. Repeat this several times to help the engine smoothly draw fuel.
This step is not required after normal startup.
If the ignition system and cylinder compression are normal but the engine does not start, the carburetor oil needle likely needs adjustment.
Fully tighten the main oil needle, then loosen it by 1/4 turn, and start the flywheel to achieve a proper gasoline-to-air mixture.
When the engine stops, always turn off the power switch.
This is a water-cooled engine. Water must be added before each operation and drained after use.
Operate the engine in a clean environment to reduce the risk of dust entering the carburetor.
The carburetor oil needle is pre-adjusted to the optimal position before shipment. Large adjustments are not recommended, but fine tuning may be required for different fuels.
The cylinder head cover can be removed to lubricate the valve mechanism. After the engine stops, remove and store the batteries.
Use new batteries to ensure sufficient voltage for the igniter. When refueling, air may remain in the fuel tank. Hold the carburetor inlet by hand and rotate the flywheel so the piston draws fuel into the carburetor.
The engine is adjusted for gasoline operation before shipment, but the carburetor may need fine tuning for different fuels by adjusting the main oil needle.
Lubrication: add no more than 4 ml of lubricating oil to the crankcase to ensure splash lubrication of the crankshaft.
Fuel type and capacity:
Fuel tank capacity: approx. 15 ml
Fuel options: gasoline or aviation kerosene
Add 4% lubricating oil to the fuel
If there is no compression, a foreign object may be preventing the valve from closing properly. Try the following methods:
Add a few drops of lubricating oil into the carburetor and drive the engine with an electric drill for a period of time to help discharge foreign matter.
Use an electric drill to rotate the engine clockwise (opposite the normal operating direction).
Fuel capacity is about 15 ml. Gasoline or aviation kerosene may be used, with 4% lubricant added to the fuel.
1 × M25 Mini Gasoline Engine Model
We are committed to providing reliable products and excellent customer service. If you encounter any issues, please contact us before leaving feedback.
Packages may be subject to customs duties or taxes depending on the destination country’s regulations. Please check before purchasing.