How much does a Mercury 115 four-stroke weigh?

Mercury lists the 115 FourStroke at 359 lb (163 kg) dry for the lightest model; the Command Thrust version is 363 lb. The 115 Pro XS is also 359 lb. Longer shaft lengths add weight.

How much does a 90 hp Mercury outboard weigh?

359 lb (163 kg) dry for the lightest model, or 363 lb with the Command Thrust gearcase. The 75, 90, and 115 share the same 2.1L block, which is why their weights match.

What is the lightest 115 hp outboard?

Mercury's 115 Pro XS at 359 lb, which Mercury says is the lightest performance 115 in its class by roughly 20 pounds. The standard 115 FourStroke is the same 359 lb in its lightest configuration.

How much does a Mercury 250 weigh?

Depends on the family: the 250 Pro XS V8 is 505 lb (229 kg) dry, while the 250 FourStroke V8 is 527 lb (239 kg), both in their lightest configurations.

Why does outboard weight matter when repowering?

Your capacity plate lists a maximum motor weight as well as horsepower. A heavier motor changes how the boat sits and planes, and modern four-strokes often weigh more than the old two-strokes they replace, so check transom capacity before you buy.

Mercury Outboard Weight Chart (2.5 to 300 HP)

Last reviewed: 2026-06-07 ## Mercury Outboard Weight Chart: 2.5 to 300 HP How much a motor weighs is not trivia. It decides whether your transom can carry it, how your boat sits at rest, and how it planes. Here's what Mercury outboards weigh according to Mercury's own...

Mercury Platinum Dealer·Family-owned since 1947·Mercury dealer since 1965·Gores Landing, ON·Quote builder available

Last reviewed: 2026-06-07

Mercury Outboard Weight Chart: 2.5 to 300 HP

How much a motor weighs is not trivia. It decides whether your transom can carry it, how your boat sits at rest, and how it planes. Here's what Mercury outboards weigh according to Mercury's own specifications, why it matters, and how to use the number.

FourStroke dry weights

HP	Dry weight (lightest model)	Notes
2.5 / 3.5	41 lb (18 kg)	Tiller portables
4 / 5 / 6	57 lb (26 kg)	Shared single-cylinder platform
9.9 EFI	85 lb (38.5 kg)	Command Thrust: 100 lb; ProKicker versions run 121 to 126 lb
15 EFI	99 lb (45 kg)
20 EFI	99 lb (45 kg)
25 EFI	132 lb (60 kg)
30 EFI	145 lb (66 kg)
40 EFI	216 lb (98 kg)	3-cylinder; the 4-cylinder 40 is 260 lb
50 EFI	247 lb (112 kg)
60 EFI	247 lb (112 kg)	Command Thrust runs a few pounds heavier
75	359 lb (163 kg)	Shares 2.1L block with 90/115
90	359 lb (163 kg)	Command Thrust: 363 lb
115	359 lb (163 kg)	Command Thrust: 363 lb
135 / 150	455 lb (206 kg)	3.0L inline-4
175 / 200 / 225	475 lb (216 kg)	3.4L V6
250 / 300	527 lb (239 kg)	4.6L V8

Pro XS dry weights

HP	Dry weight (lightest model)	Notes
115	359 lb (163 kg)	Same as the standard 115; Mercury calls it the lightest performance 115 in class
150	456 lb (207 kg)	3.0L
175	470 lb (213 kg)	3.4L V6
200 / 225 / 250 / 300	505 lb (229 kg)	4.6L V8; yes, the Pro XS V8s are lighter than the FourStroke V8s

All figures are Mercury's published dry weight for the lightest available configuration. Longer shafts, Command Thrust gearcases, and rigging add weight, so a single HP can have more than one published number. Source: Mercury Marine official specifications.

Why weight matters more than people think

Your transom has a limit. The capacity plate lists a maximum motor weight as well as horsepower. Both matter. A motor that's within the HP rating but over the weight rating still sits wrong.

It changes how the boat floats. Too much weight on the transom and the stern squats: the bow rides high, the boat porpoises, and you burn fuel fighting it. This is one of the most common things we see when someone repowers heavier than the old motor.

It affects the repower math. If you're replacing an old two-stroke with a modern four-stroke, the new motor is often heavier. Usually fine, but on a light or older hull it's worth checking before you buy, not after.

The repower angle

Most repower regret traces back to one of two things: too much horsepower, or too much weight on a hull that wasn't built for it. A bigger, heavier motor won't fix a tired hull or bad trim. Match the motor to the boat first, then talk power.

If you're repowering and not sure your transom can carry the modern equivalent of your old motor, that's exactly the kind of thing we check before we quote.

Get a real repower quote, motor, weight, rigging and all, at mercuryrepower.ca, or call 905-342-2153.

Harris Boat Works: family-owned on Rice Lake since 1947, Mercury dealer since 1965, and a Mercury Platinum dealer today.

Frequently Asked Questions

How much does a Mercury 115 four-stroke weigh?: Mercury lists the 115 FourStroke at 359 lb (163 kg) dry for the lightest model; the Command Thrust version is 363 lb. The 115 Pro XS is also 359 lb. Longer shaft lengths add weight.
How much does a 90 hp Mercury outboard weigh?: 359 lb (163 kg) dry for the lightest model, or 363 lb with the Command Thrust gearcase. The 75, 90, and 115 share the same 2.1L block, which is why their weights match.
What is the lightest 115 hp outboard?: Mercury's 115 Pro XS at 359 lb, which Mercury says is the lightest performance 115 in its class by roughly 20 pounds. The standard 115 FourStroke is the same 359 lb in its lightest configuration.
How much does a Mercury 250 weigh?: Depends on the family: the 250 Pro XS V8 is 505 lb (229 kg) dry, while the 250 FourStroke V8 is 527 lb (239 kg), both in their lightest configurations.
Why does outboard weight matter when repowering?: Your capacity plate lists a maximum motor weight as well as horsepower. A heavier motor changes how the boat sits and planes, and modern four-strokes often weigh more than the old two-strokes they replace, so check transom capacity before you buy.

Harris Boat Works · 5369 Harris Boat Works Rd, Gores Landing, ON · (905) 342-2153

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