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MERCURY MARINE2.5hp & 3.5hp 4-Stroke Outboards

MERCURY MARINE

2.5hp & 3.5hp 4-Stroke Outboards

Mercury Marine’s 4-stroke technology consumes 40% less fuel than 2-stroke models for extraordinary value and savings

Engines surpass California Air Resources Board (CARB) 3-Star Rating, making them some of the cleanest running on the market-with 91% less emissions than traditional 2-stroke outboards!

The inherent 4-stroke characteristics of ultra-quiet, smoke-free operation, plus smooth idling and running make these engines a natural choice whether you’re trolling for fish or out just for fun. Clean running 4-stroke engines from 2.5 to 20hp have a CARB three-star, ultra-low emissions rating. The decompression system and electronic CD ignition design ensure an easy, reliable start. One-stage over-rev protection and low oil pressure warning system provide extra peace of mind. Exclusive multifunction tiller handle on the 8hp and 9.9hp models features shift, steering, throttle, throttle friction, and stop controls for convenient one-hand operation. Available in manual-tilt, gas-assist and power-trim. All models are sold with a propeller.

  • Engine Type: 4-stroke
  • Features: 4-stroke technology-quiet, environmentally friendly, 40% more fuel efficient than comparable 2-stroke engines, smooth running/exceptional idling
  • Exhaust: Above prop
  • Start: Manual, with decompression system
  • Steering Type: Tiller (2.5hp-6hp), tiller or remote (8hp and higher)
  • Warranty: Five years
  • For U.S. shipment ONLY

2.5hp & 3.5hp 4-Stroke Outboards

  • Patented one-piece integrated cylinderblock design provides added reliability by eliminating gaskets and fasteners and makes the powerhead much more compact and lightweight
  • Check oil level without removing the cowling with convenient, easy-to-view sight gauge
  • This engine delivers maximum performance with the largest displacement in the 2.5 hp category
  • A twist-grip throttle and 360-degree steering make it easy to use
  • Steering Type: Tiller with 360° turning
  • Gearing: F-N, 2.15:1
  • Trim Positions: 4
  • Tank Type: Integral fuel tank (gal / L)
  • Tank Capacity: 0.3gal.

Note: These Mercury outboards have 4-stroke engines and, like virtually all 4-stroke engines, depend on oil in their crankcases for lubrication. To prevent the oil from leaking during transport, the engines are not shipped with oil in their crankcases. You must put the correct amount and grade of oil in the crankcase prior to the first use or you will cause extensive damage to your engine, which is not covered by your engine’s warranty. Please read the owner’s manual for more information.

For U.S. shipment ONLY.

Customer Reviews
Product Models
Description WM Model # MFG Part # Availability Price Quantity  
2.5hp 4-Stroke Outboard, 41lb., 15" Shaft Length, F-N Gearing, 0.3 Gallon Tank 7754849 1F02201HK
In stock online.

$900.00

3.5hp 4-Stroke Outboard, 41lb., 15" Shaft Length, F-N Gearing, 0.3 Gallon Tank 7754856 1F03201HK
In stock online.

$1,049.00

3.5hp 4-Stroke Outboard, 43lb., 20" Shaft Length, F-N Gearing, 0.3 Gallon Tank 7754864 1F03211HK
In stock online.

$1,069.00

Product Description

Mercury Marine’s 4-stroke technology consumes 40% less fuel than 2-stroke models for extraordinary value and savings

Engines surpass California Air Resources Board (CARB) 3-Star Rating, making them some of the cleanest running on the market-with 91% less emissions than traditional 2-stroke outboards!

The inherent 4-stroke characteristics of ultra-quiet, smoke-free operation, plus smooth idling and running make these engines a natural choice whether you’re trolling for fish or out just for fun. Clean running 4-stroke engines from 2.5 to 20hp have a CARB three-star, ultra-low emissions rating. The decompression system and electronic CD ignition design ensure an easy, reliable start. One-stage over-rev protection and low oil pressure warning system provide extra peace of mind. Exclusive multifunction tiller handle on the 8hp and 9.9hp models features shift, steering, throttle, throttle friction, and stop controls for convenient one-hand operation. Available in manual-tilt, gas-assist and power-trim. All models are sold with a propeller.

  • Engine Type: 4-stroke
  • Features: 4-stroke technology-quiet, environmentally friendly, 40% more fuel efficient than comparable 2-stroke engines, smooth running/exceptional idling
  • Exhaust: Above prop
  • Start: Manual, with decompression system
  • Steering Type: Tiller (2.5hp-6hp), tiller or remote (8hp and higher)
  • Warranty: Five years
  • For U.S. shipment ONLY

2.5hp & 3.5hp 4-Stroke Outboards

  • Patented one-piece integrated cylinderblock design provides added reliability by eliminating gaskets and fasteners and makes the powerhead much more compact and lightweight
  • Check oil level without removing the cowling with convenient, easy-to-view sight gauge
  • This engine delivers maximum performance with the largest displacement in the 2.5 hp category
  • A twist-grip throttle and 360-degree steering make it easy to use
  • Steering Type: Tiller with 360° turning
  • Gearing: F-N, 2.15:1
  • Trim Positions: 4
  • Tank Type: Integral fuel tank (gal / L)
  • Tank Capacity: 0.3gal.

Note: These Mercury outboards have 4-stroke engines and, like virtually all 4-stroke engines, depend on oil in their crankcases for lubrication. To prevent the oil from leaking during transport, the engines are not shipped with oil in their crankcases. You must put the correct amount and grade of oil in the crankcase prior to the first use or you will cause extensive damage to your engine, which is not covered by your engine’s warranty. Please read the owner’s manual for more information.

For U.S. shipment ONLY.

Specs

West Advisor

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REVIEW SNAPSHOT®

by PowerReviews
Mercury Marine2.5hp & 3.5hp 4 Stroke Outboards
 
1.7

(based on 31 reviews)

Ratings Distribution

  • 5 Stars

     

    (2)

  • 4 Stars

     

    (4)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (23)

23%

of respondents would recommend this to a friend.

Pros

  • Compact (10)
  • Easy storage (6)
  • Easy to use (6)

Cons

  • Unreliable (19)

Best Uses

  • Boating / sailing (11)
    • Reviewer Profile:
    • Advanced (17), Casual/ recreational (10), Professional (4)

Reviewed by 31 customers

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Displaying reviews 1-10

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(7 of 8 customers found this review helpful)

 
1.0

Stay away from the 3.5hp Outboard!

By Kimberly

from Portland, Oregon

About Me Casual/ Recreational

Verified Reviewer

Pros

  • Compact Design
  • Easy Storage

Cons

  • Unreliable

Best Uses

  • Boating

Comments about 2.5hp & 3.5hp 4 Stroke Outboards:

After owning a 6hp Mercury Marine Outboard and using it over that last five years I was confident in buying the 3.5hp for my tender. What a mistake. While my 6hp has been incredibly reliable and easy to work on the 3.5hp, right out of the box, has been finicky and downright unreliable. I have only put three hours on the motor and it has stranded me numerous times and has been incredibly difficult to start - not just for myself but for others whom have offered to help. I am going to attempt to return it and will report back on how it goes. I am VERY frustrated that I relied on the Mercury reputation rather than doing my due diligence and reading these reviews. While the engine is indeed compact and lightweight (the only reason for buying it instead of using my 6hp), as I told a friend, it's easier to get someone to help me to put a heavier motor on my transom than it is to get someone out into the middle of a channel to get a motor started.

(7 of 7 customers found this review helpful)

 
1.0

Stay away from a 3.5 HP Mercury

By Long-time boat owner

from Santa Monica CA

About Me Advanced

Pros

    Cons

    • Unreliable

    Best Uses

      Comments about 2.5hp & 3.5hp 4 Stroke Outboards:

      I've owned outboard engines for decades, starting with a 3 HP Johnson in 1956. Our current dinghy has a 60 HP Yamaha, a wonderful engine. We also carry on board an inflatable dinghy and in August 2013 we bought a 3.5 HP Mercury for it from West Marine. On its very first use out of the box, the outboard was missing a part in the carburetor, had water in the carburetor, quit running and couldn't be restarted. We rowed a mile back to the main boat. The authorized repair dealer tested the fuel I'd put in the tank and the water wasn't in my fuel, it came from somewhere else. Nevertheless I was required to pay $95 to repair it because Mercury doesn't warranty carburetors and fuel problems. The engine still stalled repeatedly and was difficult to start, especially after it was warmed up. I paid another $95 to have it serviced again. I then learned the engine has a new fuel system and other owners are having the same problems as I did. The engine had only about 5 hours on it and I'd had enough of it and I was disgusted at Mercury's failure to stand behind its products. A week ago I went to a Honda dealer and gave them $500 plus my engine for a 2.3 HP Honda, a wonderful engine. Between the $190 in repair bills and $500 for the Honda, Mercury's engine cost me $690. Although West Marine wasn't able to do anything with Mercury, I remain a staunch supporter of West Marine. But please stay away from the 3.5 HP Mercury.

      Service and delivery comments:

      West Marine's delivery of the engine was excellent.

      (6 of 7 customers found this review helpful)

       
      1.0

      Bad Motor, Good Dealer

      By Steve

      from Rochester, NY

      About Me Advanced

      Pros

      • Compact Design

      Cons

      • Unreliable

      Best Uses

      • Boat anchor

      Comments about 2.5hp & 3.5hp 4 Stroke Outboards:

      I finally returned the motor (and I never return anything) because it was totally unreliable and left us stranded twice, the last time two miles from home. The manager of the local West Marine store was totally understanding and helpful. I exchanged (and paid additional) for a 6hp Mercury they had in stock. That motor is quite a bit heavier, but starts quickly, runs smoothly and promises to be a good choice. I put two hours on it the day I got it (observing break-in restrictions) because I was so gun shy about the one I returned. I miss the light weight, but reliability trumps that every time. Last night we took the dinghy (with new motor) to dinner and came back in pitch black for a 20-minute trip. It purred right along. Happy camper (boater) :) Trustworthy dealer.
      (The recommendation --one star---is for the old motor because that's the page I'm on. The new one seems excellent)

      (3 of 3 customers found this review helpful)

       
      1.0

      An Awful Motor

      By Steve

      from Rochester NY

      About Me Advanced

      Pros

      • Compact Design
      • Easy Storage
      • Light weight
      • No Mixing Oil

      Cons

      • Had To Be Towed 2 Miles
      • Just Bad
      • This Happens Repeatedly
      • Totally Unreliable
      • Will Just Stop Runningf

      Best Uses

      • Boat anchor
      • Small Rib

      Comments about 2.5hp & 3.5hp 4 Stroke Outboards:

      I have owned many boats and many outboards. This is the most unreliable motor I have ever had. Bought it new a month ago (August 2013). Didn't notice until later the motor was actuallly manufactured in 2011 which should tell you something about how many they sell.

      The motor has a mind of it's own. It will just quit and be impossible to restart. Yesterday I was out with my grandson and the motor died 2 miles from our dock. Tried to restart for half an hour. Finally got a friendly tow from the Coast Guard Auxiliary

      (3 of 3 customers found this review helpful)

       
      2.0

      Disappointing So Far

      By Steve

      from Rochester NY

      About Me Advanced

      Pros

      • Compact Design
      • Easy Storage

      Cons

      • Unreliable

      Best Uses

        Comments about 2.5hp & 3.5hp 4 Stroke Outboards:

        I have only 4 hours on a new 3.5hp motor but I am concerned that the motor cuts out too easily after starting and then becomes tough to restart. Less of an issue when warm. This is weird because it is the exact same motor as Nissan and Tohatsu. Tohatsu makes all of them. You don't hear the same complaints about the others. I am hoping it will improve as it breaks in. I am using 10% ethanol gas but will switch to straight gas when the gallon I have is used. I do like that it is a 4 stroke and quite light in weight

        (5 of 6 customers found this review helpful)

         
        1.0

        Great Science Project, Lousy Motor

        By Scott

        from Connecticut

        About Me Advanced

        Pros

          Cons

          • Stalls And Won't Restart

          Best Uses

            Comments about 2.5hp & 3.5hp 4 Stroke Outboards:

            Bought a Mercury 3.5 from West Marine and it has been an enormous problem. Stranded often, almost from the start. Engine stalls after 10-20 minutes of use and will not restart for an extended period. Yesterday, with a Zodiac full of wife, 2 kids and Golden Retriever, I had the pleasure of a 30 minute row before a friendly neighbor came by and towed us back to our dock. After a series of fantastic Yamahas and Hondas there is precisely zero possibility I would ever own another Mercury. My 7 year old son feels similarly and hopefully will be a buyer of non-Mercury outboards for many decades to come.

            (8 of 8 customers found this review helpful)

             
            1.0

            DO NOT PURCHASE!!

            By Irate Sailor

            from Richmond, British Columbia

            About Me Casual/ Recreational

            Pros

              Cons

              • Unreliable

              Best Uses

                Comments about 2.5hp & 3.5hp 4 Stroke Outboards:

                This motor is only useful as a paper weight. As an outboard to use to power or dingy to shuttle from shore to our sailboat and back at various anchorages, this motor has proven to be utterly unreliable, won't start, or once started, it stops for no reason we can discern. We have ended up rowing our rigid inflatable far more frequently than we have powered it with this motor. DO NOT BUY IT.

                (4 of 5 customers found this review helpful)

                 
                1.0

                BUYER BEWARE!

                By Ripper

                from Calgary, Alberta

                About Me Professional

                Pros

                  Cons

                  • Jets In Carb Need Sizing
                  • Starts But Doesn't Run
                  • Unreliable

                  Best Uses

                    Comments about 2.5hp & 3.5hp 4 Stroke Outboards:

                    The jets in the carb are sized too small hence the fuel intake isn't enough to keep motor running. Don't buy this product unless you want to spend less time fishing than on motor repair.

                    (7 of 8 customers found this review helpful)

                     
                    1.0

                    Save for a larger engine

                    By SlapFish

                    from New Orleans, LA

                    About Me Casual/ Recreational

                    Pros

                    • Easy To Use

                    Cons

                    • Unreliable

                    Best Uses

                    • Canoeing

                    Comments about 2.5hp & 3.5hp 4 Stroke Outboards:

                    Put this engine on the back of my 12' jon boat. Not enough power to push the boat adequately. Pice is decent, but should've save a few hundred more for more of an upgrade.

                    (7 of 8 customers found this review helpful)

                     
                    4.0

                    some issues, outstanding service

                    By Yves

                    from Los Angeles CA

                    About Me Advanced

                    Pros

                    • Compact Design

                    Cons

                      Best Uses

                      • Boating

                      Comments about 2.5hp & 3.5hp 4 Stroke Outboards:

                      I have been using this engine for one year now to power my 21 Minitransat sailboat:. it is a racer, and I picked this engine because of the power / weight ratio. I faced some issues at the beginning (gas flow was not stable, motor stopping after 30 mins in summer), but this has been immediately fixed when I contacted Mercury USA. They added a small fuel pump, and it works perfectly now. Other people run the same engine around me with no issue. hard to say what happened with that one, but at the end of the day, the Service was so outstanding that I can only recommend this brand and engine. Nice to see this level of service.

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