Skip to content Skip to navigation menu

MERCURY MARINE
15hp & 20hp 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: Thru-prop
  • Start: Manual, with decompression system
  • Steering Type: Tiller (2.5-6hp), tiller or remote (8 and higher)
  • For U.S. shipment ONLY

15hp & 20hp 4-Stroke Outboards

  • Gearing: F-N-R, 2.15:1; Model 10181675-F-N-R
  • Trim Positions: 5 + shallow-water drive
  • Tank Type: External
  • Tank Capacity: 6.6gal.

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.

  • Trim Positions: 5 with auto ratchet + shallow-water drive
  • Tank Type: External
  • Tank Capacity: 3.2gal.

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.

Product Models
Description WM Model # MFG Part # Availability Price Quantity  
15hp 4-Stroke Outboard, 115lb., 15" Shaft Length, F-N-R, 2.15:1 Gearing, External 6.6 Gallon Tank 10181659 1F15201HK
In stock online.

$2,539.00

Add to My List
15hp 4-Stroke Outboard, 118lb., 20" Shaft Length, F-N-R, 2.15:1 Gearing, External 6.6 Gallon Tank 10181667 1F15211HK
In stock online.

$2,559.00

Add to My List
15hp 4-Stroke Outboard, 115lb., 15" Shaft Length, Electric Start, F-N-R, 2.15:1 Gearing, External 6.6 Gallon Tank 10307635 1F15301HK
Delivery within 2 - 3 weeks.

$2,949.00

Add to My List
15hp 4-Stroke Outboard, 118lb., 20" Shaft Length, Electric Start, F-N-R, 2.15:1 Gearing, External 6.6 Gallon Tank 10307643 1F15311HK
Delivery within 2 - 3 weeks.

$2,959.00

Add to My List
20hp 4-Stroke Outboard, 115lb., 15" Shaft Length, F-N-R, 2.15:1 Gearing, External 6.6 Gallon Tank 9774100 1F20201HK
In stock online.

$2,949.00

Add to My List
20hp 4-Stroke Outboard, 118lb., 20" Shaft Length, F-N-R Gearing, External 6.6 Gallon Tank 10181675 1F20211HK
In stock online.

$2,979.00

Add to My List
20hp 4-Stroke Outboard, 115lb., 15" Shaft Length, Electric Start, F-N-R, 2.15:1 Gearing, External 6.6 Gallon Tank 10322543 1F20301HK
Delivery within 2 - 3 weeks.

$3,295.00

Add to My List
20HP 4-Stroke Electric Start, Short Shaft, Remote Shift 10322568 1F20302HK
Delivery within 2 - 3 weeks.

$3,275.00

Add to My List
20hp 4-Stroke Outboard, 118lb., 20" Shaft Length, Electric Start, F-N-R, 2.15:1 Gearing, External 6.6 Gallon Tank 10322550 1F20311HK
Delivery within 2 - 3 weeks.

$3,325.00

Add to My List
20hp 4-Stroke Outboard, 118lb., 20" Shaft Length, Electric Start (Remote), F-N-R Gearing, External 6.6 Gallon Tank 10322576 1F20312HK
Delivery within 2 - 3 weeks.

$3,299.00

Add to My List

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: Thru-prop
  • Start: Manual, with decompression system
  • Steering Type: Tiller (2.5-6hp), tiller or remote (8 and higher)
  • For U.S. shipment ONLY

15hp & 20hp 4-Stroke Outboards

  • Gearing: F-N-R, 2.15:1; Model 10181675-F-N-R
  • Trim Positions: 5 + shallow-water drive
  • Tank Type: External
  • Tank Capacity: 6.6gal.

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.

  • Trim Positions: 5 with auto ratchet + shallow-water drive
  • Tank Type: External
  • Tank Capacity: 3.2gal.

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

The West Advisor articles have answered boaters' questions and provided solutions to boating problems for more than 20 years. West Marine has compiled one of the Web's most comprehensive collections of technical boating information articles.

REVIEW SNAPSHOT®

by PowerReviews
 
4.4

(based on 10 reviews)

Ratings Distribution

  • 5 Stars

     

    (7)

  • 4 Stars

     

    (0)

  • 3 Stars

     

    (3)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

90%

of respondents would recommend this to a friend.

Pros

  • Easy to use (7)
  • Safe (5)
  • Compact (3)
  • Easy storage (3)
  • Waterproof (3)

Cons

  • Heavy (6)

Best Uses

  • Boating / sailing (9)
    • Reviewer Profile:
    • Advanced (7)

Most Liked Positive Review

 

This Motor is AWESOME!!!

I use this on my 14' Jon Boat. It was easy to install onto it and it runs amazing. It gets up and goes fast and easily manuverable. This is the best motor...Read complete review

I use this on my 14' Jon Boat. It was easy to install onto it and it runs amazing. It gets up and goes fast and easily manuverable. This is the best motor I got for my boat and I couldnt be happier. the only thing I don't like is it is a little loud on idle.

VS

Most Liked Negative Review

 

Good Motor, High Price - 15HP

Mercury 15HP 4-Stroke

I use this engine on a Roughneck 330 RIB, and at firts everything went okay. Easy to install, does not consumpt much fuel, and...Read complete review

Mercury 15HP 4-Stroke

I use this engine on a Roughneck 330 RIB, and at firts everything went okay. Easy to install, does not consumpt much fuel, and fast.
As I have used many other engines, this one is defenitily good. It is quite heavy, but that is actually the only con i have except for the price.

Know that all Mercury outboards under 50 HP are produced by Tohatsu ( i came out after i purchased this engine ).

Tohatsu is cheaper, and the exact same engine. Though, this Mercury has a nicer desine and looks more compact.

Overall, a good engine for cassual use.

Reviewed by 10 customers

Displaying reviews 1-10

Back to top

(2 of 2 customers found this review helpful)

 
5.0

I got a great price and super service.

By Jim

from MA

About Me Advanced

Verified Buyer

Pros

    Cons

      Best Uses

      • Boating

      Comments about 15hp & 20hp 4-Stroke Outboards:

      Just bought this motor and the store could not have provided better service. Thanks West Marine!

      • Was this a gift?:
      • No

      (3 of 4 customers found this review helpful)

       
      5.0

      nice powerful motor for my West Marine RIB-310 dinghy

      By RickTara

      from Eliot, ME

      About Me Advanced

      Verified Buyer

      Pros

      • Easy To Use
      • Quiet

      Cons

      • Heavy

      Best Uses

      • Boating

      Comments about 15hp & 20hp 4-Stroke Outboards:

      recently purchased a new RIB-310 hypalon dinghy. I had a Honda 5hp that I moved over from my old inflatable. It became clear soon that it was underpowered. It was great around the harbor but not more. This new 15 hp is incredible. It zips the boat along, easily planes and I no longer worry about current in the river. Only comment is that it is heavy. Would buy again.

      • Was this a gift?:
      • No

      (1 of 1 customers found this review helpful)

       
      5.0

      20 HP 15" is ideal on a 350 Hypolon RIB

      By 24thesea

      from Fort Myers, FL

      About Me Advanced

      Pros

      • Easy To Use

      Cons

      • Heavy

      Best Uses

      • Boating
      • Personal Watercraft

      Starts well and runs great

      (5 of 5 customers found this review helpful)

       
      3.0

      Mercury 15hp 4 stroke outboard.

      By Howard Sterndrive

      from St Clair Shores, MI

      About Me Advanced

      Pros

      • Quiet Fuel Efficient

      Cons

      • Harder To Start Than A 2
      • Heavy
      • More Maintenance Than A 2
      • Nit As Fast As A 2s

      Best Uses

      • Boating

      This is a nice quiet motor. I have 2 inflatable ribs, one with a mercury 15 2s & one with a Merc 15 4s. The new 4s is quiet & runs well, but it is no match for the old 2s. The weight difference is huge. 75ish lbs for the old 2s & 118 for the new 4s.
      The new 4s seems to sit higher & further back than the old 2s, adding to its heavy feel.
      If weight is no factor than the 4s is a great choice. If you are looking for the best motor for a small inflatable, look for used 2s.

      (6 of 6 customers found this review helpful)

       
      5.0

      Sweet 15 HP 4 Stroke Mercury

      By Little Saint

      from Colorado

      About Me Beginner

      Verified Buyer

      Pros

      • Easy To Use
      • Safe

      Cons

        Best Uses

        • Boating

        Comments about 15hp & 20hp 4-Stroke Outboards:

        First Dinghy Boat with a sweet new 15HP 4 stroke Mercury. Loving it.I'm mobility impaired and was able to steer it easily.

        (8 of 9 customers found this review helpful)

         
        3.0

        Good Motor, High Price - 15HP

        By Stan Bootyman

        from Florida

        About Me Professional

        Pros

        • Compact Design
        • Easy Storage
        • Easy To Use
        • Fast Acceleration
        • Safe
        • Waterproof

        Cons

        • Heavy

        Best Uses

        • Boating

        Comments about 15hp & 20hp 4-Stroke Outboards:

        Mercury 15HP 4-Stroke

        I use this engine on a Roughneck 330 RIB, and at firts everything went okay. Easy to install, does not consumpt much fuel, and fast.
        As I have used many other engines, this one is defenitily good. It is quite heavy, but that is actually the only con i have except for the price.

        Know that all Mercury outboards under 50 HP are produced by Tohatsu ( i came out after i purchased this engine ).

        Tohatsu is cheaper, and the exact same engine. Though, this Mercury has a nicer desine and looks more compact.

        Overall, a good engine for cassual use.

        (7 of 7 customers found this review helpful)

         
        5.0

        Great little motor 15hp

        By Papasann (compliments of my daughter!)

        from NE Nevada

        About Me Casual/ Recreational

        Verified Reviewer

        Pros

        • Compact Design
        • Easy Storage
        • Easy To Use
        • Safe
        • Waterproof

        Cons

        • Heavy

        Best Uses

        • Boating
        • Fishing

        Comments about 15hp & 20hp 4-Stroke Outboards:

        I purchased this motor for my fishing boat (A Sun-Dolphin) and it works GREAT! No noise,fast out of the hole,runs all day and I use an eye-dropper to fill the gas tank. Plus it being a four-stroke you are not contributing to water pollution. Had the electric trim installed on it but do not find much use for it Works great but I do not think worth the $. ;-)

        (8 of 8 customers found this review helpful)

         
        3.0

        20 hp remote start and shift

        By autoteacher

        from Georgia

        About Me Advanced

        Comments about 15hp & 20hp 4-Stroke Outboards:

        The engine is most likely very good BUT make sure if you order the electric start you are not getting a tiller! You will have to buy from Merc or other vendor a remote control and cables. No one at WM told me about this and was clueless when I told them there is nothing in the online catalog or product page that leads you to think you will not have a tiller. Understand I am not upset with the engine, store or staff there.

        (5 of 6 customers found this review helpful)

         
        5.0

        great motor

        By steve

        from holiday fl

        About Me Advanced

        Pros

        • Easy Storage
        • Easy To Use
        • Safe

        Cons

          Best Uses

          • Boating

          Comments about 15hp & 20hp 4-Stroke Outboards:

          the motor is a year old . I love this motor. I had one issue rope did not retract dealer took care of problem.

          (20 of 20 customers found this review helpful)

           
          5.0

          This Motor is AWESOME!!!

          By Snookin Dakota

          from Cape Coral, FL

          About Me Advanced

          Pros

          • Compact Design
          • Easy To Handle
          • Easy to install
          • Easy To Use
          • Fast
          • Functional
          • Great strength
          • Safe
          • Strong
          • Waterproof

          Cons

          • Heavy
          • Loud idle

          Best Uses

          • Boating
          • Jon boat
          • Youth

          Comments about 15hp & 20hp 4-Stroke Outboards:

          I use this on my 14' Jon Boat. It was easy to install onto it and it runs amazing. It gets up and goes fast and easily manuverable. This is the best motor I got for my boat and I couldnt be happier. the only thing I don't like is it is a little loud on idle.

          Displaying reviews 1-10

          Back to top