Four-stroke outboard motor Parsun F5BMS The 5 horsepower has long been one of the most talked-about options for fishermen and small boat owners, and on the one hand, it's a budget alternative to Japanese brands like the one that's on the market. Yamaha or HondaOn the other hand, Chinese manufacturing is a concern for many potential buyers, but what do those who already operate this unit for 2-3 seasons say? Real-life owner reviews From different regions of Russia, we analyzed typical problems and identified hidden advantages, which are silent in advertising brochures.

We'll pay special attention. fuel-flow (Spoiler: It depends heavily on the screw), carburettor reliability (The main "sick" node in many), and also comparable Parsun 5 with the closest competitors. Tohatsu MFS5 and Mercury F5MIf you're faced with a choice, or if you've already bought this motor, and you want to know how to extend its life, this article will help you avoid costly mistakes. FAQ with answers to the most controversial questionsincluding compatibility with PVC boats and features of the break-in.

Technical specifications Parsun F5BMSWhat is hidden in the specifications

On paper. Parsun F5BMS Looks more than worthy for its price segment: four-stroke engine with an upper valve arrangement (PHOTO)OHV), electronic ignition CDIBut there are some things that the manufacturer doesn't say.

  • 🔧 Engine capacity 139 cm3 (competitors often have 123-135 cm3), which should theoretically give more torque at low revs.
  • ⚙️ Transfer ratio The gearbox is 2.08:1. This is a compromise option, but for boats with a length of 3.2-3.6 m, many owners recommend installing a screw with increments. 9-10 inches staff-up 8.5.
  • ⛽ Fuel consumption The real tests show 1.8-2.2 l / h at full load, and in economical mode (2/3 of gas) - 0.9-1.1 l / h.
  • 🔋 Fuel tank capacity 1.1 liters (12 liters external tank comes with a set) And here's the catch: when you're excited in the water, the fuel hose can detach from the quick lift if you don't lock it in with a screed.

One of the most controversial things. gearboxUnlike aluminum gearboxes, MercuryIt uses a composite alloy, which some owners call "plastic." aluminiumBut when it hits rocks, it really cracks more often than its competitors, but the engine weighs only 26 kg, which is 3-4 kg lighter than similar models.

📊 What kind of screw do you use with the Parsun F5BMS?
Stately (8.5)
9 inches
10 inches
Another (write in the comments)
I know.

Home » News » owner reviews: top 5 problems and how to avoid them

After analyzing more than 150 reviews on the forums (Fish-House.ru, Lodka-PVH.ru) and in VKontakte groups, we have highlighted The five most frequent complaints on Parsun 5Importantly, most of them are not related to structural defects, but to misuse Or break-in.

⚠️ Attention: If after running (the first 10 hours) do not replace the oil with synthetic oil 10W-40 For four-stroke motors, there is a risk of rings at 50 hours, which is a common rookie error that results in loss of compression.
Problem. Frequency of mentions Decision
Swimming idle turns 42% Cleaning the jelly carburetor, adjusting the screw quality of the mixture, 80% of the time it's the fuel with additives.
Overheating during long-term work 28% Pump check (often clogged with sand), thermostat replacement. Use only the original antifreeze Parsun Coolant.
High-speed vibration 20% Balancing the screw or replacing it with a 3-blade one, checking the motor's attachment to the transom (weakened bolts increase vibration).
Oil leak from under the valve cover 15% Replacement of gasket (article) 90300-30013Use a sealant. Loctite 574 when installed.
Difficult launch to cold 12% Candle check (NGK BPR6ES - best option), cleaning the air filter, in the cold below -10 ° C, it is recommended to heat the carburetor with a hairdryer.

Critical information: In 2023, a batch of engines produced in May-June had a defect in the valve springs (burst after 30-40 hours). F5BMS2305... or F5BMS2306...Be sure to check the valve for the SRT before the warranty expires. Parsun has officially acknowledged the problem and is conducting a free replacement.

Comparison with competitors: Parsun 5 vs Tohatsu MFS5 vs Mercury F5M

To understand how justified savings when buying ParsunAnd we're going to compare it to the two most popular ones in the same power class, and for objectivity, we're going to take not just the technical data, but also the technical data. average 3 years (including consumables and typical repairs)

  • 💰 The price of a new engine (2026):
    • Parsun F5BMS — 85 000 ₽
    • Tohatsu MFS5 — 120 000 ₽
    • Mercury F5M — 135 000 ₽
  • 🔧 Cost of TA for 3 seasons (oil, filters, candles):
    • Parsun 12,000 RUB (including replacement of gaskets)
    • Tohatsu — 8 500 ₽
    • Mercury — 9 200 ₽
  • ⚡ Unique chips:
    • Parsun: lightest (26 kg), built-in fuel tank 1.1 l
    • Tohatsusystem Oil Alert (Automatic shutdown at low oil level)
    • Mercury5-year warranty on gearbox, steel propeller shaft

According to the owners, Parsun lose out to competitors carburettor-durability ooh Tohatsu and Mercury It lasts 1.5-2 times longer, and corrosion resistance But he's winning in detail. maintainability: parts are 2-3 times cheaper, and the design is easier for self-maintenance. For example, replacing the crankshaft oil costs 1,200 RUB for the first time. Parsun vs. 3,500 for Mercury.

💡

If you plan to use the engine intensively (more than 100 hours a year), it is better to pay extra for the engine. Tohatsu or MercuryFor rare trips (up to 50 motor hours/year) Parsun F5BMS The best choice in terms of price/quality ratio.

Fuel consumption: how to save 30% without losing speed

One of the most frequent questions is fuel consumption Parsun 5According to tests conducted by the Rybolov-Profi magazine in 2023, the engine shows the following results:

  • 🛥️ PVC boat 3.2 m (1 person, calm water) 0.7-0.9 l/h at cruising speed (2/3 of gas).
  • 🛥️ Aluminum boat 3.6 m (2 people + cargo) 1.2-1.5 l/h same load.
  • 🌊 with chop 2-3 points, the expense increases by 25-30% It's because of increased resistance.

The secret to saving is screw-upThere's an aluminum screw coming from the factory. 8.5×7 (8.5 inches, 3 blades) For most boats, it's too easyIt's a throttle that makes the engine spin to maximum speed, but it doesn't give you any speed gain.

Type of boat Recommended screw Fuel economy
PVC up to 3.2 m aluminum 9×6 steely 9×7 20%
Aluminum 3.4-3.6 m Steel. 10×7 (for example, Solas 1013-100-11) 30%
Inflatable hard bottom (RIB) 3-blade 9.25×8 (for example, Michigan 013207) 25%

Another way to reduce the cost. carburettorMany owners complain about the "gluttony" of the engine, unaware that it runs on an enriched mixture. Parsun F5BMS:

  1. Mixture quality screwL) 1.25 revolutions from fully twisted.
  2. Idle screw - 0.75-1 revolution (adjust to a stable 800-900 rpm).
  3. Check the setting every 20 hours - over time, the jellyfish clogged.
💡

If the carburetor is adjusted and the motor is dead when the throttle is opened abruptly, check the accelerator pump. 90300-30021).

Running and first TO: mistakes that kill the engine in a season

The first 10 hours of the motor cycle are the critical period for Parsun F5BMSIncorrect running leads to ring-wearingI'm gonna have a problem with the oil caps. step-by-step checklistThis will save you from expensive repairs:

Use the oil. SAE 30 or 10W-30 for running (not synthetic!)|Not to exceed 3/4 gas in the first 2 hours |Alternate modes: 5 min for 1/2 gas, 5 min for 3/4 gas | After the first 2 hours, let cool for 30 minutes |Replace oil after 10 motor hours (even if it is clean!)->

Typical mistakes of beginners:

  1. Using Cheap Oil (for example, Lukoil StandardIn the first hours of operation, the engine is particularly sensitive to lubricant quality. Motul Outboard Tech 10W-30 or Quicksilver 10W-30.
  2. Long-term single workThis results in the formation of a swelling on the candle and in the combustion chamber, the minimum load is 1/3 of the gas.
  3. Ignoring the check of anchoragesAfter the first 2 hours of operation, be sure to tighten the engine mount nuts to the transom and check the tightening of the cylinder head bolts.

After the break-in first-to shall include:

  • 🔧 Replacement of oil (required with washing) 10 minutes single. oil-wash Liqui Moly Outboard Flush).
  • 🔥 Checking and cleaning the candle (the gap should be) 0.7-0.8 mm).
  • 🛢️ Cleaning of the fuel filter (located under the quick removal of the gas hose).
  • 🌀 Lubrication of the gas cable and reverse with silicone lubrication CRC 2-46.
⚠️ Attention: If after running the engine began to "sneeze" with a sharp opening of the throttle, this is a sign enriched mixtureYou need to adjust the accelerator pump of the carburetor (pump screw twist 1/4 revolution).

Repair and parts: where to buy and how much it costs

One of the main advantages Parsun — low-cost But there are pitfalls here: about 30 percent of the parts on the market are low-quality fakes. original Average prices (at the beginning of 2026):

Detail Articulum Cost ()) Note
Piston ring set 90300-30005 2 800 Included: 2 compression + 1 oil removable
Carburetor (full) 90300-30015 7 500 Floats are more likely to fail (90300-30018, 800 ₽)
Water-cooled pump 90300-30025 3 200 Change every 2 seasons or 200 hours
Salnick Krival (set) 90300-30030 1 500 When replacing, be sure to check the beating of the shaft
Propeller (aluminum, 9×7) 90300-30040 4 200 The original weighs 1.2 kg (forgeries - 0.9 kg)

Where to buy spare parts:

  • 🛒 Official Parsun dealers (detail warranty, but prices are 15-20%) parsun.ru.
  • 🌍 Overseas online stores:
    • AliExpress shop Parsun Official Store) Original parts, but delivery is 3-4 weeks.
    • eBay (seller) outboard_parts_pro) - rapid delivery but risk of forgery.
  • 🔧 Local services (for example, Roller. in Moscow BoatService In St. Petersburg – often there are popular spare parts.

Average cost of repair:

  • 🔧 Replacement of the piston group - 8 000-12 000 RUB (with work).
  • 🛠️ Carburetor repair – 2,500-4000 RUB (depending on the degree of contamination).
  • 💦 Replacement pump - 1,800 RUB (if you do it yourself).
How to distinguish the original part from the fake?

Original details Parsun have:

1. the company logo (knocked out, not a sticker) on the packaging.

2. hologram with serial number, which can be checked on the manufacturer's website.

3. Marking MADE IN CHINA (fakes are often written) MADE IN JAPAN or ASSEMBLED IN EU).

The package includes a warranty card with the dealer's stamp.

Modding and tuning: what can be improved in Parsun F5BMS

Despite the budget price, Parsun 5 It has a good potential for modernization. top-5 upgradesThis will improve the performance of the engine:

  • 🔥 Installation of a sports propeller (for example, Solas Amita 3 10×8It increases speed by 5-7% by reducing slippage, costing 12,000-15,000 RUB.
  • ⚡ Replacement of candles with iridium (NGK Iridium IX BPR6EIXImproves the start in the cold and reduces fuel consumption by 3-5%. Cost: 1,800 RUB.
  • 🛡️ Installation of gearbox protection (for example, Parsun Guard KitIt prevents damage from hitting rocks, costing 3,500 RUB.
  • 💨 Upgrade of the cooling system Replacement of the thermostat with Sierra 18-3936 (opens at 55 C instead of 65 C) Helps to avoid overheating in hot weather. Cost: 2,200 RUB.
  • 🎛️ Installation of an electronic tachometer (for example, Lowrance TM165It allows you to control the speed of the car exactly and avoid torsion. It costs 6,000 RUB.

One of the most controversial tunings is power-up It can be up to 6-7 hp by breaking the cylinder and replacing the piston. It's theoretically possible (the unit holds), but in practice it leads to:

  • ❌ Reducing the life of the engine by 2-3 times (from 1,500 to 500 motor hours).
  • ❌ Problems with registration in GIMS (the engine is officially certified only for 5 hp).
  • ❌ Increase fuel consumption to 2.5-3 l / h.

If you need a power reserve, it is better to consider buying. Parsun F6BMS (6 hp) - it costs only 12,000 RUB more expensive, but has a reinforced crankshaft and an improved carburetor.

FAQ: Answers to the most controversial questions about the Parsun F5BMS

❓ Can I use it? Parsun 5 On a 3.6m long PVC boat?

Yes, but with reservations:

  • The maximum length of the boat for this engine is 3.8 m (according to the passport).
  • For a boat of 3.6 m it is recommended:
    • Use a screw with a step 10 inches.
    • Do not exceed the load of more than 350 kg (2 people + equipment).
    • Strengthen the transom with an additional plate (thickness of at least 10 mm).
  • The speed with one person is 25-28 km / h, with two - 18-22 km / h.
❓ What kind of gasoline to fill: AI-92 or AI-95?

The manufacturer recommends AI-92But there are nuances:

  • The AI-95 can be used, but no additives (for example, Lukoil Ecto 95 or Gazpromneft 95).
  • If after refueling the 95th engine began to "detonate" (a beeping knock at a set of turns), you need:
    • Dump the gas and flush the carburetor.
    • Install a "colder" candle (in the case of a colder one).NGK BPR7ES instead BPR6ES).
  • In the cold below -10 ° C, it is better to use AI-92 - it is less prone to condensation formation.
❓ How much does it serve? Parsun F5BMS With proper operation?

Average engine life in compliance with the maintenance regulations:

  • 500-700 motor-hours - before the first overhaul (replacement of rings, glands, valves).
  • 1,000-1,200 motor-hours - full life before write-off (when replacing the piston group on 600-700 motor watches).
  • For comparison: Tohatsu MFS5 It is used for 1,500-1,800 motor hours. Mercury F5M - up to 2,000.
  • The main factors reducing the resource:
    • Use of cheap oil (for example, TNC Standard).
    • Operation without running or in violation of the regulations.
    • Storage of the engine in winter without preservation.

Example from practice: owner with a nickname @FisherSPb forum Fish-House.ru He reported 850 motor watches on his own. Parsun F5BMS The secret is to change the oil every year. Motul Outboard Tech 10W-40 And flush the carburetor every 50 hours.

❓ Can I move it? Parsun 5 In the trunk of a car?

Yeah, but with the rules:

  • The engine must be. vertically (Dadewood up).
  • You need to drain the gasoline from the tank (even if it is external).
  • Close the carburetor air intake with film to avoid dust.
  • If you are transporting in a horizontal position (for example, in a trailer), after transportation, let the oil drain into the crankcase (put the engine vertically for 10-15 minutes before starting).
  • In the trunk. cannot transporting the engine together with gasoline canisters is a traffic violation (a fine of 2,000 RUB under Art. 12.21.2 of the Administrative Code).
❓ What to do if the engine falls in the rain or falls in the water?

Algorithm of action:

  1. Turn off the engine immediately. (if he worked)
  2. Water drain:
    • Turn the engine down lower unit and shake (water will flow out of the exhaust windows).
    • Unscrew the drain plug of oil (water is heavier than oil and settles at the bottom).
  • Dry:
    • Remove the roofs