Choosing a reliable outboard motor for a small boat is always about balancing price, weight and traction. Bullet 3.6Often seen as an alternative to popular Chinese Yamaha or Tohatsu, the engine is designed to operate in challenging environments that require simplicity of design and maintainability, and many aquatic motorists choose this model for installation on lightweight PVC boats or small aluminum Kazankas.
The main attention when choosing a unit attracts it working-room This is a limit value that allows you to use the engine without mandatory registration in the GIMS, if the total power of the power plant does not exceed 10 hp (although the rules may change, and this point should be clarified in the current legislation).
In this article, we will discuss in detail the technical nuances, configuration features and real experience of owning this device. You will learn how to properly run in order not to lift the piston in the first hours of operation, and whether it is worth changing the regular spark plugs immediately. It is critical to know that the standard gear ratio on many versions of this motor is 2.08, which requires the use of screws with increments of no more than 4 inches for efficient operation. Let’s take it all in order so that your purchase doesn’t become a disappointment.
Technical specifications and design features
Engine. Bullet 3.6 It is based on the classic two-stroke scheme with crank-chamber purges. This system provides high specific power with a minimum weight, but requires careful mixing of fuel and oil. The weight of the motor in running order usually does not exceed 10-11 kilograms, which makes it easy to carry it with one hand or set on a transomania without the use of complex tooling. The engine Carter is made of silymium alloy, which ensures sufficient strength at a relatively low cost of production.
The ignition system is most often implemented through an electronic CDI (Capacitor Discharge Ignition) that eliminates the need for the wearer to adjust the gaps in the interrupter, as was the case with older contact systems, but the reliability of the ignition coil and switch directly depends on the quality of the sealing of the underhood space. Water cooling It's implemented through the off-shore water coming through the intake in the lower unit, and it's important to keep an eye on the control trickle, because the lack of it signals overheating, which can lead to a piston wedge in minutes.
The fuel system is a membrane carburetor, which allows the engine to operate at any roll of the boat, which is especially true for inflatable soft-bottom vessels. The fuel tank is usually 1.2 liters, which is integrated into the design or supplied separately depending on the configuration.
⚠️ Warning: When assembling the fuel system, be sure to check the integrity of the fuel hoses. The vibration characteristic of two-stroke engines in this class can quickly RUB poor-quality plastic against the metal elements of the casing.
Performance, speed and fuel consumption
Real power of the engine Bullet 3.6 data-sheet figures promises a confident plane with one person on board a light boat up to 3 meters long. In practice, the speed depends on many factors: load, bottom condition, type of propeller and atmospheric pressure. When fully loaded (boat + 2 people + equipment), the engine goes into displacement mode, and the speed drops to 6-8 km / h.
Fuel consumption is one of the main trump cards of small two-strokes. In an economical mode, which is about 60-70% of total gas, the engine consumes about 1.2-1.5 liters of gasoline per hour. When you go full-gas, appetites increase to 2 liters per hour. This makes the engine very economical for fishing or cruising, where high speed is not required, but the fact that there is traction against the current or wind is important.
The acceleration dynamics are directly dependent on the pitch of the propeller. The propellers often have averaged specifications that are not always ideal for a particular boat hull. If the engine does not spin to the turn of the cutoff, the speed will be low and the flow rate is high. Conversely, if the propeller is too light, the engine will work in spacing, losing traction at the stop.
Use a tachometer for outboard motors when selecting the propeller. The optimal speed for long-term operation of this engine is in the range of 4500-5000 rpm.
Below is a table showing approximate speed figures depending on load and type of vessel (data averaged for calm water):
| Type of vessel | Loading (kg) | Mode of work | Speed (km/h) |
|---|---|---|---|
| PVC 2.9 m | 80 (1 person) | Full gas. | 18-22 |
| PVC 3.2 m | 150 (2 persons) | Full gas. | 12-14 |
| Aluminum 3.0 m | 100 (1 person) | Full gas. | 20-24 |
| PVC 3.5 m | 200 (2 persons + cargo) | Medium gas | 8-10 |
The process of running and preparation for the first launch
The first hours of operation determine the life of the engine for years to come. Bullet 3.6 It's not a formality, it's a necessary process for the working out of the piston group and crankshaft bearings. The factory lubrication applied during assembly cannot provide full protection in dynamic modes, so ignoring the break-in stage often leads to bullies.
It takes about 10 hours of operation or 10 full tanks of fuel. In the first 2-3 hours, it is not recommended to open the throttle by more than 50%. The engine should operate in variable modes: acceleration, constant speed, braking. This allows the piston rings to fit evenly against the walls of the cylinder. The mixture of oil and gasoline during this period is better done slightly richer than the instruction recommends - for example, in a ratio of 1:25 instead of 1:50.
☑️ Checklist before first launch
After every 2-3 hours of work, you need to conduct an external inspection, pay special attention to the absence of fuel and oil leaks, also check the temperature of the lower part of the lower unit - it should not be hot to the touch if the engine is running on idles. If you smell burnt metal or see smoke from under the casing, immediately silence the engine.
⚠️ Warning: Never run dry (without diving the lower unit in water) and without connecting the cooling system with a hose. Working without water cooling for even 30-60 seconds is guaranteed to overheat and deform parts.
Setup of the carburetor and maintenance of the power system
The carburetor is the heart of any two-stroke engine. Bullet 3.6 It's responsible for mixing, and often from the factory, carburetors are tuned to a poor mixture to meet environmental standards, which in our environment can lead to overheating and detonation, and are adjusted using screws of quality and quantity of mixture, which may require the removal of the casing.
The right setup requires you to heat the engine to operating temperature, then rotate the quality screw to achieve maximum and stable idling speeds, then set the number screw to the desired speed, so that the engine does not deafen when the valve is opened sharply, if the engine dies when the gas is added sharply, the mixture is too poor, if it choked and smoked - too rich.
It is important to use quality oil for two-stroke engines with markings. TC-W3Cheap mineral oils can form soda on candles and in the exhaust duct, which reduces power and increases fuel consumption. Synthetic and semi-synthetic oils burn cleaner and provide better lubrication.
The Secret to Stable Work
Often the problem with unstable revs is not the settings of the carburetor, but the air pump through the gasket between the carburetor and the cylinder. Before adjusting, be sure to check the condition of this gasket and replace it if necessary or use a heat-resistant sealant.
Typical malfunctions and methods of their elimination
Despite the simplicity of the design, the engine Bullet 3.6 The most common problem is that it's difficult to start after a long period of downtime, often due to the loss of tightness of the crankshaft glands or suffocating cuffs, and in a two-stroke engine, the coils work both ways, and their wear leads to air suction, which disrupts the absorption process of the fuel mixture.
The second common problem is overheating, which can be caused by clogging of the cooling channel (algae, sand) or breakage of the impeller of the water pump, made of rubber and eventually loses elasticity or collapses when working "dry." Replacing the pump is a simple procedure, but requires careful assembly so as not to damage new blades.
The third thing is vibration and noise. The motors in this class are vibrating at first, but excessive shaking can indicate an imbalance in the crankshaft or wear of bearings, and it's also worth checking the tightening of the diewood screws to the lower unit leg and the condition of the slit joints.
- 🛠️ The engine will stall at high speeds: check the fuel filter in the tank and the condition of the candle cap.
- 💨 The engine smokes and loses power: check the proportion of the mixture of oil and gasoline, as well as the condition of the exhaust windows of the cylinder for coking.
- 🔥 Candle quickly covered with soot: replace the candle with the recommended one (usually NGK B7HS or analogue) and check the angle of ignition ahead.
- 💧 No water trickle: clean the control hole with thin wire, perhaps there was a small garbage or shell.
Timely replacement of the oils and impeller pump (once in 2-3 seasons) costs 10 times cheaper than repair or replacement of the piston group after overheating or water getting into the crankcase.
Comparison with competitors and summary
Small motors market Bullet 3.6 The Bullet's main advantage is that it is often more affordable with similar specifications. However, the quality of casting and assembly can vary from batch to batch, which requires the owner to have initial mechanical skills.
Unlike the four-stroke counterparts, the two-stroke bullet requires constant preparation of the mixture, but benefits in weight and ease of transportation (you can transport in any position, although it is better still vertical). Four-strokes are heavier, have oil in the crankcase and more difficult to maintain, but quieter and more economical at low revs.
Finally, the motor Bullet 3.6 It's a great tool for an amateur fisherman or a small boat owner who is willing to pay attention to maintenance, it doesn't require complex electronics, it's easy to repair in garage conditions, and it provides enough traction to move around the water, and when you're right, it can go off for a season, giving you the pleasure of communicating with water.
Do I need to register the bullet 3.6 engine in the GIMS?
According to Russian law (at the time of writing), small vessels with an engine capacity of over 8 kW (about 10.88 hp) are subject to registration. Since the bullet power of 3.6 hp, the engine itself does not require registration. However, if the boat has several engines and their total power exceeds 10 hp, registration is mandatory. Always clarify the current rules, as they may change.
Which oil is better to put in the fuel mixture?
Use only oils designed for two-stroke water-cooled engines (marked TC-W3). Motorcycle oils (JASO FD/FC) have a different base and can form more carbon when operating in an aqueous environment, as well as worse burn. The optimal ratio for running is 1:25, for normal use is 1:50 (unless otherwise specified by the oil manufacturer).
Bullet 3.6: Why does it triple or work unevenly?
The uneven operation is most often caused by three reasons: (1) A leaky fuel system (air suction). (2) A carburetor or fuel filter is clogged. (3) A malfunction of the ignition system (a failure of the coil or candle tip). Start the diagnosis with a candle replacement and check the fuel supply.