Choosing a reliable power unit for a small PVC boat or metal boat is often a challenge for a beginner. The market is oversaturated with offers, but Yamaha Enduro 8 It has a special place among the lovers of quiet fishing and family recreation, and has earned a reputation as an unbeatable workhorse capable of operating in the harshest conditions.
The two-stroke design, which is 139 cubic centimeters, delivers excellent low-revving traction, which is critical when you go planing under full load. Yamaha 8 He confidently pulls the boat even where the four-stroke analogues begin to choke.
It is important to note that the model is a class. 9.9 hp with a software limit of up to 8 hpThis makes the purchase particularly attractive in terms of the long-term perspective and the possibility of upgrading without replacing the engine itself.
Technical specifications and design features
Yamaha engineers have built a machine that is based on a time-tested platform, has two cylinders and is powered by a carburetor system, which makes it easy to maintain, and weighs 34.5 kg, allowing one person to transport and install on a transom without the use of sophisticated lifting equipment.
The CDI ignition system guarantees a stable start-up in all weather. Fuel system It is designed to use AI-92 gasoline in a mixture with oil, which is the standard for two-stroke engines.
Forced-circulated water cooling effectively removes heat even when operated at full speeds for long periods of time, and the thermostat is not present in this model, which simplifies the design, but requires careful consideration of the active part (pump). Yamaha 8 Enduro It has a gear ratio of 2.08, which is an excellent indicator for engines of this class.
Below is a table of the main technical parameters that will help you compare this model with competitors:
8 hp (software)
| Parameter | Meaning |
|---|---|
| Workload | 139 cm3 |
| Maximum power | |
| Weight. | 34.5 kg |
| Fuel tank | 12 l (external) |
| Shifting | F-N-R (Forward-Neutral-Back) |
Advantages of the model over competitors
The trump card. Yamaha Enduro 8 It's extremely reliable. It's very simple to design, it minimizes the number of nodes that can fail, and unlike the more sophisticated electronic systems of competitors, there's very little to break down if you follow the basic rules of operation.
High torque at low revs allows for the use of propellers with a large pitch, which gives an advantage when driving against the current or with a heavy boat. Yamaha 8 It is not afraid of overgrown algae as much as some four-stroke analogues, due to the peculiarity of the exhaust and the design of the lower unit.
⚠️ Warning: Despite the reliability, do not try to lift the engine behind the ramp. This can lead to failure of the gearshift mechanism or damage to the mounts.
Another important advantage is the availability of spare parts, which have been mass-produced for many years, so you can find a piston, carburetor or pump at almost any service center. Repairability The model is at the highest level.
When buying a used engine, be sure to check the compression. For a two-stroke Yamaha, values in the area of 10-12 atmospheres are considered normal.
Fuel consumption and efficiency of operation
The question of fuel consumption often becomes decisive when choosing between two-stroke and four-stroke engines. Yamaha 8As a two-stroke, it requires a fuel mixture, and the average flow rate for full gas is about 2.5-3 liters per hour, which is quite acceptable.
At cruising speeds, which are typically around 3,500-4000 rpm, consumption is reduced to 1.5-2 liters, which allows you to comfortably fish all day on a single 12-liter tank, and the economy is achieved by fine-tuning the carburetor and efficiently burning the mixture.
- 🐟 For fishing in trolling, the engine consumes a minimum amount of fuel, working at low speeds.
- ⛽ The use of high-quality oil for two-stroke engines reduces smoke and nagaroprostivovovoznoy.
- 🚤 A properly selected propeller can reduce fuel consumption by up to 10-15% due to the optimal operating mode.
It is worth considering that saving on oil is categorically unacceptable. Cheap analogues can lead to overheating and bullying. Yamaha It is recommended to use branded oils or their qualitative analogues with a tolerance of TC-W3.
breaking in process: step-by-step instructions
Proper running is key to a long life for your engine, and neglecting this stage can reduce the life of your engine. Yamaha Enduro 8 It takes about 10 hours or a few fuel tanks to produce.
In the first 30 minutes of operation, it is recommended not to exceed 50% of the maximum power, the engine should be worn away, all moving parts should take their final shape, and then you can briefly increase the speed, but not more than 80%.
☑️ Checklist of proper breaking in
During the break-in, it is important to constantly monitor the control stream of water, if it has disappeared or became weak, you should immediately turn off the engine, and you should also regularly check the tightening of the bolts, as vibration during the laundry period can weaken them.
⚠️ Warning: Never run the motor on land without connecting to water or a barrel, guaranteed to overheat and jam the piston group in minutes.
At the end of the first 10 hours, it is recommended to replace the spark plugs and the oil in the gearbox. In the oil, the products of the primary grinding of the gears may appear, and their removal will prolong the life of the mechanism. Instructions It also requires checking the condition of the fuel filters.
Typical malfunctions and methods of their elimination
Despite the reliability, Yamaha 8 It can be a problem that requires the attention of the owner, and it's often a fuel quality or ignition problem, and carburetor jellycles are the most common cause of idle failure.
Cooling problems are usually caused by sand or silt getting on the water intake, regular visual inspection and cleaning of the lower unit grille helps to avoid overheating, and it is also worth keeping track of the impeller pump, changing it according to the regulations.
- 🔧 A difficult start is often solved by replacing candles or cleaning the fuel system.
- 🌊 The water in the cylinders can lead to a hydraulic shock if the motor has been standing in water for a long time with lower unit lowered.
- 🔥 The coar on candles indicates an incorrect proportion of the mixture or a malfunction of the ignition system.
The secret of stable work of the carburetor
To prevent problems with the carburetor in the off-season, be sure to use a fuel stabilizer or completely drain gasoline from the system before long-term storage. The fuel residues are oxidized and converted into resins that clog thin channels.
If the engine starts to develop less power, check the condition of the lower unit for shells. Even a small layer of growth can significantly reduce the efficiency of the screw and increase the load on the engine. Diagnostics It should always start with an external inspection.
Selection of screws and setting up for the boat
Selection of propeller for Yamaha Enduro 8 Depending on the type of boat and the weight of the crew, a regular propeller usually has a pitch of 8-9 inches, which is good for heavy boats. Lightweight PVC boats with one angler may require a large-step propeller to increase speed.
The optimum full-gas speeds for this engine are in the range of 4500-5500 rpm. If the tachometer shows less, then the pitch of the propeller is too large or the boat is overloaded. If more, the motor is running in a scattering range, which is dangerous for the resource.
Aluminum screws are cheaper, but when hit by an underwater obstacle, they bend, transmitting vibration to lower unit. Stainless Steel costs more, but holds the pitch better and deforms less. Yamaha 8 There are special speed screws that allow you to squeeze the maximum.
A properly selected screw allows the motor to reach maximum speeds in the range of 5000-5500 rpm, providing better dynamics and resource savings.
Owner reviews and summary
By analyzing the experience of operation, we can say that Yamaha Enduro 8 It's still a market leader, and owners praise it for being able to start half-around even after winter downtime, and many people use it as a backup engine on large boats because of its reliability.
The downsides are often the noise of all two-strokes and the need to mix gasoline, but for many fishermen, these downsides are the thrust and simplicity of the design, and the engine forgives many of the mistakes of beginners.
In conclusion, it's worth saying that the ethos is calm on the water. If you want a motor that will start in any situation and get to the shore, even if you forgot to check the oil last season (though you shouldn't), then you can use it. Yamaha 8 - your choice.
Can I remove the power limit from 8 to 9.9 hp?
Technically, the Yamaha Enduro 8 and 9.9 engines are often identical, software-based through a switch or petal valve, and the removal of the restriction is possible by replacing the parts, but this will deprive you of warranty and may require re-registration with GIMS.
Which oil is best used for the mixture?
Use only oils labeled TC-W3. Yamaha two-stroke branded oil or quality Motul analogs, Liqui Moly will provide better lubrication and less gas buildup. Proportion is usually 1:50.
Is Yamaha 8 hot enough at low speeds?
Yamaha's two-stroke engines have an efficient cooling system; the temperature is lower at idle speeds, but the water circulation is maintained; problems with overheating at low speeds only occur when the pump malfunctions or the channels clog.