Buying an outboard motor with your hands is always a lottery, where not only money is at stake, but your safety on the water. 5 horsepower Four-stroke engines have become the standard for those who enjoy quiet fishing and small inflatable boats, and are quiet, fuel efficient and do not require constant fuel mix preparation, making them extremely attractive for beginners.
But the used appliance market is full of offers that are easy to get confused about. Tohatsu or Yamaha For half the price, or you can buy a "designer" with the resource developed. The main difference between a four-stroke engine and a two-stroke brother is the presence of a full-fledged crankcase lubrication system, which imposes its own features on the diagnosis when buying.
In this article, we will discuss in detail what to look at, what questions to ask the seller and how not to become the owner of a problem unit, you will learn about the hidden defects that are not visible on the first inspection, and understand whether it is worthwhile to contact used equipment at all in the current realities.
Advantages of four-stroke thrust at low power
Choice in favour four-stroke The 5 hp power is often driven by the desire to maximize comfort with minimal fuel consumption. Unlike two-strokes, there's no need to mix oil with gasoline. You just pour a clean AI-92 into the tank and swim, which is especially convenient for those who go out on a regular basis and don't want to mess with the proportions.
Another important argument is noise and vibration levels, and a four-stroke cycle allows for a smoother piston ride, which reduces the overall noise background. Fishermen They value this quality, because a quiet motor is less scary for the fish and allows you to talk comfortably with your partner without screaming, and they also have a better environmental footprint, which is important for bodies of water with a security status.
Engine resource is also important: four-stroke engines are more complex in design, but when properly maintained, they run much longer than their smoke-smoking counterparts. The absence of open exhaust through cylinder purge windows reduces the corrosion load on the interior parts.
But the weight is also important. A four-stroke five will always be heavier than a two-stroke power because of the oil crankcase and the more complex gas distribution mechanism, and if you plan to often drag a boat alone over long distances, this factor can become critical.
Criteria of choice: condition and mileage
When you decide buy a outboard motor booThe first thing you need to do is to abstract from the beautiful photos and pay attention to the technical condition. Vendors often write "mileage is minimal," but not everyone has meters on the water, and visual evaluation can be deceptive.
Notice the condition of the lower unit (legs) and the screw. Deep bullies, dents, or stone impact marks indicate careless operation. If the screw has chipped or blade deformity, this may indicate problems with the lower unit shaft or gearbox. Ideally, the screw should be smooth, and the lower unit - without deep corrosion.
Be sure to ask the seller to show the engine on land, and the sound of the engine running will tell you more than a thousand words of the seller.
It's important to check for all the original elements. The covers, the rumble, the fuel hose, the fungus, everything must be in place. The absence of even a small plastic latch may indicate that the engine was opened, possibly for serious repairs. Factory seals on the bolts of the carburetor attachment or the head of the block should also be intact, if they are not there - the motor was precisely disassembled.
Look at the spark plug. It's a great indicator of how the engine works. If the candle is dry and has light brown soak, the engine is good. Black soak indicates an over-enriched mixture or soaking, and white indicates overheating. Oily plaque on the candle thread in a four-stroke engine is a warning sign of wear on the piston group or oil caps.
Diagnosis: checking compression and reducer
The most important step before buying is technical diagnostics, and without special equipment, it's hard to assess the internal state, but everyone can do basic checks. compressionFor four-stroke 5 hp motors, the normal indicator is the range from 9 to 12 atmospheres (kg / cm2). The scatter between the cylinders (if there are two, although 5 hp more often one) should not exceed 1 atmosphere.
☑️ Checklist of engine check before purchase
The second critical node is the gearbox, which is a four-stroke engine that works under heavy conditions, transmitting torque, check for an emulsion in the gearbox oil, unscrew the bottom oil plug, and if white smetan flows from there instead of black or clear oil, water has entered the gearbox, which indicates that the seals are not sealed.
⚠️ Attention: If you feel a sharp dip or snack when you scroll through the engine with your hand (taking off the candle), don't buy this motor. This is a sign of damage to the crank-shaking mechanism or a foreign object hitting the cylinder.
Also, be sure to check the cooling system. When operating the motor on land (in a water tank or a hose supplied) from the control hole (the "urinal"), the jet of water must confidently beat. A weak jet or its absence means clogged channels or a malfunction of the pump impeller. Overheating for a four-stroke engine is fatal and can lead to bullies in the cylinder.
Popular models and their features
The secondary market is dominated by several major manufacturers, and the Japanese company has been the leader for many years. TohatsuTheir series. MFS5C It's a lightweight, simple and very tenacious engine, and many Chinese brands copy Tohatsu's design, so it's the easiest part to find.
Motors. Yamaha They're a little heavier and often more expensive to maintain, but they're notorious for their thrust, but you have to be careful, there's a lot of Chinese people on the market disguised as Yamaha, and you can always tell the difference between the quality of the aluminum casting and the engraved engine number.
The secret of marking engines
The engine number is stamped on lower unit, the first letters indicate the country of manufacture, Japanese engines have the corresponding codes, while Chinese copies may not have clear markings or contain errors in fonts.
Chinese brands such as Hidea, Parsun or Sea-ProThey offer lower prices. When you buy them, you have to be prepared for the fact that the quality of the metal may be inferior to the Japanese. You often have problems with corrosion of fasteners and plastic. However, if the motor was maintained, it can last for years.
Comparative table of popular models will help to orient in the specifications:
| Model | Weight (kg) | Engine capacity (cm3) | Type of launch | Features |
|---|---|---|---|---|
| Tohatsu MFS5C | 25.0 | 99 | manually | Lightweight, proven construction |
| Yamaha F5CMHS | 27.0 | 112 | manually | High traction, heavier than analogues |
| Hidea HD-F5.0 | 26.0 | 99 | manually | Budget clone of Tohatsu |
| Suzuki DF5AS | 25.0 | 99 | manually | Rare but reliable |
Pricing and the risks of buying
The cost of a used 5 hp 4 cycle engine varies widely. Price depends on the year of production, condition, availability of documents and brand. Japanese engine in good condition can cost from 40 to 60 thousand rubles, while Chinese analogues can be found for 25-35 thousand. Too low price is the first sign of hidden problems.
The risks of buying used equipment are high. You may encounter a motor that has been in water (drowned), or a unit that has a twisted motor hour. Drowning The problem is that the electrical and internal cavities can corrosion after a month of active operation. Check the electrical connectors: if they show a green oxidation plaque, the engine is clearly urinated.
The optimal price of a used 5 hp engine is 50-60% of the cost of a new one. Anything cheaper requires thorough defects.
It's also worth checking the history of ownership. If one person owned the motor and there are checks for oil and candles, that's a good sign. Motors that have passed through the hands of rental bases or fishing clubs usually have high wear, even if they look good.
Post-purchase service
After you've decided Buy a outboard motor b 5 hp 4 strokeFirst, do the full TR, even if the seller says he just changed the oil, change the oil in the crankcase and gearbox, check the condition of the fuel filter-sludge, and lubricate all the syringes. This is basic hygiene, which will prolong the life of the unit.
Be sure to replace the spark plug with a new one that meets the manufacturer's recommendations. The old candle may work, but its life is unknown. It is also recommended to treat the electrical contacts with a spray to protect against moisture to prevent oxidation in the future.
⚠️ Attention: Do not use conventional car oil for four-stroke outboard motors. They work under different heat loads and have a specific cooling. Use oils labeled with the label.
NMMA FC-W.
The first hours of operation after purchase should be spent in a gentle mode. Don't give full gas, let the engine warm up. Listen to the engine: any extraneous knocking or change in the tone of work should be an excuse to stop and check.
Frequently Asked Questions (FAQ)
How much does a four-stroke 5 hp engine really serve?
With regular oil change (every 50-100 hours) and careful operation, the lifespan is between 1,500 and 3,000 motor hours. Chinese engines usually run less - about 1,000-1,500 hours before major repairs.
Can a four-stroke motor be transported on either side?
No, it's a myth. four-stroke engines can only be placed on the starboard side (from the exhaust side) or strictly vertically. Laying on the left side can lead to oil entering the combustion chamber and hydraulic impact.
What kind of gasoline to pour into a four-stroke engine?
Most modern 5-stroke engines are designed for AI-92 gasoline. The use of AI-95 does not provide advantages, and in some cases can lead to overheating due to later ignition.
Do I need to register the 5 hp engine in GIMS?
Since 2021, in Russia, engines up to 10 hp (8 kW) do not require registration if the total weight of the equipped vessel with the engine does not exceed 200 kg.