Two-stroke outboard motor with power 4bhp. It's the best choice for owners of small PVC boats, aluminum and inflatable transom vessels, which combines compactness, lightness and sufficient thrust to move along rivers, lakes and coastal areas. Yamaha, Mercury, Honda And Chinese brands? key selection criteriaCompare popular models, tell about the nuances of operation and registration in GIMS.

Feature two-stroke motors - simplicity of design, high specific power and a relatively low price compared to four-stroke counterparts. mandatory mixing of oil with gasoline in a ratio of 1:50 or 1:100 (depending on the model)And in fact, modern two-tacters (like the one that scares a lot of people) Yamaha 4FMHS or Mercury ME 4M>) is equipped with direct oil injection systems that simplify maintenance.

Why is 4 HP the best power for a small boat?

Power-powered motors up to 5 hp No registration is required for the GIMS (as of 2026), which saves time and money, while 4 “horses” are enough for:

  • 🚤 PVC boat up to 3.2-3.5 m long with a load of 2-3 people;
  • 🎣 Fishing in quiet water (speed 15-20 km / h);
  • 🏞️ Moving along rivers with moderate currents;
  • 💰 Fuel savings (consumption of 2-3 l / h at an average load).

For comparison: 2.5-3.5 hp is suitable only for single trips, and 5-6 hp will already require registration and increase gasoline costs. 4bhp. - The middle ground, especially if you plan to use the motor on water bodies with limited power (for example, in protected areas).

📊 What type of boat do you have?
PVC boat
aluminum boat
Hard-bottomed inflatable boat
Other

Top 5 two-stroke engines 4 hp in 2026: comparison of models

The market offers dozens of options, but we have selected them. 5 most reliable models in terms of price/quality, taking into account the owner feedback, the availability of spare parts and service in Russia.

Model Weight, kg Engine capacity, cm3 Lubrication system Average price, ) (2026)
Yamaha 4FMHS 26 123 Automatic (Autolube) 110 000–130 000
Mercury ME 4M 27 123 Manual (pre-mixing) 105 000–125 000
Hidea HD-40FS 24 98 Automatic. 65 000–80 000
Tohatsu M 3.5B/4 25 98 Manual 90 000–105 000
Parsun F4BMS 26 102 Automatic. 70 000–85 000

The leader of the ratings. Yamaha 4FMHS Thanks to the legendary reliability and system AutolubeBut if you have a budget, you have to look at the oil. Parsun F4BMS (Chinese clone) Yamahaor Hidea HD-40FS They are cheaper by 30-40%, but require more careful maintenance.

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Automatic lubrication system (Autolube) simplifies operation, but increases the cost of the engine by 20-30%.

two-stroke vs four-stroke engine: which is better for a boat?

The main difference is the principle of operation and maintenance requirements.

  • ⚡ Power/weighttwo-stroke motors are 20-30% lighter and deliver more power from the same volume.
  • 🛢️ Fuel consumptionfour-stroke is more economical by 15-25%, but require a separate pouring of oil into the crankcase.
  • 🔧 Service2-strokes are easier to repair, but need regular cleaning of candles and carburetor.
  • 🌿 Environmental friendliness4-strokes meet the standard Euro-52-strokes, more often Euro-2.

For fishing on small bodies of water two-stroke 4 hp engine. four-stroke is justified if you plan long hikes (for example, on the Volga or Baikal), where economics and quiet work are important.

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If you choose a motor for salt water (sea fishing), give preference to models with anode protection and coating. Zinc-rich (for example, Mercury Marine or Tohatsu Saltwater Series).

What to look for when buying?

Before buying, check the following parameters:

lower unit length (should correspond to the height of the transom of the boat)|Kill switch)|Kill switch management type (tiller or remote)|Manufacturer's warranty (optimally 2-3 years)|Availability of a service center in your region->

Critical moment - transom height. PVC is suitable for most boats. short lower unit (S) (381 mm), for aluminum boats with high transence, long (L) (508 mm) Check this with the seller!

⚠️ Attention: Motors with manual oil mixing (for example, Mercury ME 4M) cheaper, but require precise proportions, a mistake in the mixture will lead to bullying on the piston and expensive repairs.

How much does a 4 hp two-stroke outboard motor cost in 2026?

Prices depend on the brand, configuration and region:

  • 🏷️ Budgetary models (Hidea, Parsun, HDX): 60 000–85 000 ₽;
  • 💰 Mid-segment (Tohatsu, Suzuki): 90 000–110 000 ₽;
  • 💎 Premium (Yamaha, Mercury): 110 000–140 000 ₽.

The cost may vary depending on:

  • 📦 Set (tool kit, gasoline canister, case);
  • 📍 Region (in Moscow and St. Petersburg prices are 10-15% higher than in the regions);
  • 🛒 Promotions and seasonal discounts (the best time to buy is autumn-winter).

Where can I buy it cheaper? Official dealers offer a guarantee, but often overprice. Avito or jule You can find used motors that are 50 to 100 hours in range, and they're 30 to 50 percent below the new model. buying from hands without checking the compression and condition of the piston group - the risk of getting a "cat in a bag".

How to check the used motor before buying?

1. Start the engine at idle - should work smoothly, without vibrations.

2. Check the compression (normal for two-stroke: 8-10 kg / cm2).

3. Examine the candle - the coar should be light brown, without oil deposits.

4. Make sure there is no backlash in the crankshaft bearings (rock the flywheel manually).

5. ask the seller to pre-empt checks for oil and gasoline - this indirectly confirms regular maintenance.

Do I need a 4 hp engine registration in GIMS?

As of today, 2026, power-driven motors up to 5 hp (inclusive) not registered The State Inspectorate for Small-Sized Vessels, however, has some nuances:

  • 📄 If the boat is long 2.5 m motorized more than 3.68 kW (5 hp)registration is mandatory;
  • 🚨 In some regions (for example, Moscow, St. Petersburg) local restrictions may apply.
  • 🛥️ For motorized vessels up to 10.88 kW (15 hp) required boat registration certificatebut not GIMS.

To avoid fines (from 500 to 1,500 RUB), specify the current rules for the GIME Or at the local office. 4bhp. enough passport for the product and a receipt for the purchase.

⚠️ Attention: If you plan to go out on navigable rivers (Volga, Don, Yenisei), even with a 4 hp engine may be required. sailing-permit Please check this out in advance.

Maintenance and repair: how to extend the life of the engine?

Term of service two-stroke It depends on the quality of the fuel and the regularity of maintenance.

  1. Fuel mixture: Use the gas. AI-92 and oil for two-stroke water-cooled engines (e.g., Yamalube 2M or Motul Outboard Tech 2TThe proportion of -- 1:50 (20 ml of oil per 1 liter of gasoline).
  2. Washing after salt water: After each trip by sea or salt lake, wash the cooling system with fresh water for 5-10 minutes.
  3. Anode replacement: Every 50–100 hours check the condition of the zinc anode (if it is worn out by 60%, replace it).
  4. Storage: Before winter, drain the fuel, lubricate the cylinders, store the engine in an upright position.

Typical breakdowns and their causes:

  • 🔥 Overheating - clogging of the cooling system (grass, silt);
  • 🛑 Unstable turnovers - pollution of the carburetor;
  • 💥 Extraneous knocking - wear of crankshaft bearings;
  • ⚡ Lack of spark - malfunction of the ignition coil or candle.

For self-repair, a set of tools and manuals is enough (for example, Yamaha 4FMHS Service BookComplex work (replacement of the piston group, cylinder ploughing) is better entrusted to the service center.

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Using poor-quality oil reduces the life of the engine by 30-40%, saving on lubrication will turn into expensive repairs.

FAQ: Frequent questions about 4 hp two-stroke engines

❓ Can I use 95th gasoline instead of 92th?

Yes, but it doesn't add power, and in some cases it can overheat because of the higher combustion temperature. AI-92.

❓ What is the life of a two-stroke engine 4 hp?

With the right service, 1,500-2,500 motor-hours (10-15 seasons with loads of 100-150 hours/year) Chinese models (in Chinese).Hidea, Parsun) serve less, about 1,000-1,500 hours.

❓ Do I need to dilute the oil for running?

In the first 10 hours, increase the proportion of oil to 1:25 (40 ml per 1 liter of gasoline) This will protect the piston group from premature wear.

❓ Can I install a 4 hp engine on a boat 4 meters long?

Technically, yes, but the engine will run to the limit. The optimal length of the boat is up to 3.5 m. For a 4-meter boat, you better choose the engine. 6-8 hp.

❓ Which oil is better: mineral or synthetic?

For new engines (<5 years) semisynthetics (for example, Motul Outboard Tech 2TFor the old (with wear) - mineral (with wear)Lukoil 2T Outboard), as it seals the gaps better.