The decision to buy a used boat is often motivated by the desire to save a significant amount or to get a more powerful and reliable kit at the same price as a new, but less equipped, used equipment market is now saturated with offers, and find an option where you can find a new one. 9.9-engine It will cost you a reasonable amount of money, if you know where to look and what to look at.
But buying mileage is always a lottery, where the winnings depend on your attention and technical knowledge. Many beginners make the mistake of focusing only on the appearance of the case or the year of release, forgetting about the critical components of the engine and transom. In this article, we will discuss in detail how to choose a reliable kit consisting of PVC boats or aluminum body and outboard motor with a capacity of 9.9 horsepower.
A 9.9 hp power is considered the middle ground for small and medium-sized boats, enough to sleeve a boat with two passengers and a small load with a steady load, while still fueling efficiently, and buying a used motor is a great way to enter the world of water-powered vehicles without a huge investment.
Market analysis: why 9.9bhp is the best start
The segment of engines with a capacity of up to 10 horsepower is the most popular among anglers and outdoor enthusiasts. outboard motor 9.9 Often structurally different from 15-horsepower models, but has software or mechanical limitations (stubs in the carburetor or firmware), which makes them a great object to buy, as the resource they usually have is huge.
In the secondary market, you can find famous Japanese brands, such as: Tohatsu and Yamahaand the Chinese type of units that are gaining popularity Hidea or ParsunThe choice between them depends on your budget and willingness to do maintenance. Japanese equipment is famous for being unstoppable and affordable parts even for older models, while the Chinese offer modern electronics for less money.
It is important to understand that the price of a used boat + motor kit can vary significantly. Cheapness often indicates hidden problems: a gearbox developed, cracks in the lower unit or fatigue of the boat material. Market value is formed from the year of production, the number of motorcycle hours (if there is a counter), the state of anticorrosion anodes and the general appearance.
⚠️ Warning: Never buy a motor if the salesman refuses to demonstrate its performance on water or even on a dry tank.
Diagnostics of the outboard motor: hidden defects
Verification outboard The first step is to start the inspection with a visual assessment of the lower unit (legs). The presence of deep scratches, dents or welding marks on the lower unit may indicate a collision with underwater obstacles, which could lead to displacement of the shafts or damage to the glands. Check the condition of the anti-cavitation plate: it should be flat, without signs of overheating or deformation.
The next step is to check the compression. For two-stroke motors, which are most commonly found in this power class, a value above 6-7 atmospheres is considered normal (although the exact figures depend on the model, for example, for the engine). Yamaha 9.9 The rules may differ from MercuryIf the compression is significantly lower than normal or varies widely between cylinders, the engine requires major repairs to the piston group.
Make sure to unscrew the spark plugs. The color of the spark plugs tells you how the engine works: black soda indicates a re-enriched mixture or burning of oil, white plaque indicates overheating or a poor mixture. The ideal color is brick-brown. Also note the metal shavings in the gearbox oil: if the oil is "coffee with milk" or contains shiny particles, the sealing of the os is broken, and the gearbox "diees."
- 🔍 Check the condition of the lower unit for dents and cracks, especially in the area of the lower unit pipe.
- 🔍 Measure compression: the spread between the cylinders should not exceed 10-15%.
- 🔍 Look at the candles: the color of the soda will indicate the quality of combustion of the fuel mixture.
- 🔍 Check the oil in the gearbox for emulsion or metal shavings.
How to check the thermostat without disassembly?
Start the engine on land (shortly!) or in a barrel and touch the cylinder block. It should warm up evenly. If one part is hot and the other is cold, or if the engine boils instantly, the cooling system is faulty. You can also check for the jet "control": a weak jet often indicates a clogged water pump (impeller).
Boat inspection: PVC vs. Aluminium
The choice of boat type directly affects operating conditions and maintenance requirements. flyboat First, check the condition of the seams. Press the cylinders in the pumped state: they must be elastic and not to blow air. Examine the surface for "hernias" - swelling between the layers of tissue, which indicate the dissection of the material and the imminent rupture.
For aluminum boats ("Kanak", "Voronezh", "Crimea"), inspection of the transom and bottom is critical. transom is the place where the motor attaches, experiencing maximum vibration loads. The tree inside the translator could rot even if the paint layer was intact on the outside. Knock the translator: a deaf sound can indicate hidden voids. Check the bottom for dents and, most importantly, for traces of repair.
The important thing is the load capacity. The 9.9 hp engine can only accelerate the boat to planing if the weight limits are met. If the boat is too heavy or overloaded, the engine will run at its limit, consuming a lot of fuel and quickly wearing out. boat-size certified for power up to 10 hp inclusive.
| Parameter | PVC Boat | aluminum boat | Plastic boat |
|---|---|---|---|
| Weight of kit | Light (30-50 kg) | Medium (60-90 kg) | Heavy (80+ kg) |
| Puncture resistance | Low (fears sharp objects) | Tall (but swelling) | Medium (may crack) |
| Repairability | High (repack in your pocket) | Difficult (to be welded) | Difficult (requires fiberglass) |
| Duration of service of b/u | 5-10 years (depending on storage) | 20+ years (perpetual) | 15+ years |
When buying a used PVC boat, be sure to inflate it and leave it in the sun for a few hours. If the pressure drops, look for a soap solution etching site. In winter, buying PVC is risky: in the cold, the material tans and microcracks may not appear immediately.
Legal aspects and documents
Purchasing used equipment requires careful attention to documents. boat-engine The main document is a PSM (Small Passport) or a merchant check with a store stamp if the engine is new, but sold used. The lack of documents can create problems when registering with GIMS, although engines with a capacity of up to 9.9 hp (inclusive) in the amount of a boat weighing up to 200 kg often do not require registration, but ownership documents are necessary.
Check the numbers on the lower unit and cylinder block. They must match the data in the PCM. If the numbers are shot down, interrupted or not read, this technique is absolutely not to buy — it can be stolen property or a “designer”. It is also worth checking whether the motor is not listed as stolen, although this is less common for PLMs than for cars.
If the boat requires registration (total power of the engines is more than 8 hp or the weight of the equipped vessel is more than 200 kg), make sure that the seller removes it from the register before sale or issues you all the necessary documents for re-registration. The contract of sale is drawn up in triplicate and must contain the boat's VIN number, engine number, passport details of the parties and the transaction amount.
⚠️ Note: Buying an undocumented motor (PCM) is only possible if you do not plan to register it (power up to 9.9 hp and boat up to 200 kg). Otherwise, you will not be able to legally operate the equipment on public water bodies.
☑️ Checking documents before the transaction
Test Drive: Assessment of driving qualities
The ideal test is a water test, and if the seller agrees to do that, it's a good sign. During the test, pay attention to the vibration. Boat with engine Strong vibration may indicate an imbalance in the propeller, damage to the lower unit or problems with the suspension of the motor.
Evaluate the cooling system. The control jet must be powerful and stable. If it appears, it disappears, it means that the system has an air plug or the impeller pump is worn out. Also listen to the sound of the exhaust: a loud, sharp sound can indicate a burnout piston or a leaky exhaust system.
Check the gear shift. The lever should be clear, without jamming or unnecessary backlashes. The switch from neutral to front and back should be with a characteristic but not too loud click. If the gears are turned on with difficulty or you hear a grinding, the problem is in the control cable or in the gearbox itself.
- 🚤 The vibration at idling should be minimal.
- 🚤 The jet of the cooling system is smooth and continuous.
- 🚤 Shifting gears are clear, without delay and grinding.
- 🚤 The engine must confidently gain full speed without "failures".
The lack of the possibility of a test drive on water is not a reason for refusing to buy, but requires more thorough diagnosis on land: compression check, visual inspection of candles and check the starter operation are mandatory.
Frequent Buyer Questions (FAQ)
Should you buy a Chinese engine 9.9 hp b / w or better an old Japanese?
It's a matter of priorities. Chinese engines.Hidea, Sea-Pro) often newer in year of production and cheaper, but may require more frequent replacement of consumables and have less predictable casting quality.Tohatsu, Yamaha) It's more reliable and easier to repair, but it might be running out of resources. If you can screw, you can take China. If you want a "sit and go" technique, look for a live Japanese.
Can you “suffocate” the engine 9.9 hp to 15 forces yourself?
Technically, it is often possible (replacement of the lobe valve, phase change, removal of restrictions), but this voids the warranty (if any) and reduces the engine life. In addition, operating a motor with a power higher than specified in the PSM is a violation of registration rules and can lead to penalties.
What to look for when buying a PVC boat older than 5 years?
PVC's main enemy is ultraviolet light and improper storage. Check the elasticity of the fabric: it should not crack when bending. Check the joints' gluing sites for bloating. If the boat was kept in the sun without a tent, its life could be halved, even if it looks normal.
Which screw is better to choose for a boat with a 9.9 hp engine?
For heavy boats or full load, a smaller propeller (e.g., 8-9 inches) is better suited, which will give you better traction at the start. For light boats and fishing alone, the standard pitch (10-11 inches) is optimal, which ensures high speed. The universal option is to have two propellers: traction and speed.
Buying a 9.9 boat kit is a smart way to get reliable equipment, taking your time, checking each node carefully, and asking the seller uncomfortable questions, and being careful at the selection stage will save your budget and your nerves while operating on the water.