How much does a Mercury 115 four-stroke weigh?

Mercury lists the 115 FourStroke at 163 kg (359 lb) dry for the lightest model; the Command Thrust version is 165 kg (363 lb). The 115 Pro XS is also 163 kg (359 lb). Longer shaft lengths add weight.

How much does a 90 hp Mercury outboard weigh?

163 kg (359 lb) dry for the lightest model, or 165 kg (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 163 kg (359 lb), which Mercury says is the lightest performance 115 in its class by roughly 9 kg (20 lb). The standard 115 FourStroke is the same 163 kg (359 lb) in its lightest configuration.

How much does a Mercury 250 weigh?

Depends on the family: the 250 Pro XS V8 is 232 kg (511 lb) dry, while the 250 FourStroke V8 is 239 kg (527 lb), using the brochure's listed configurations; confirm the exact model and shaft before ordering.

Why does outboard weight matter when repowering?

Check the boat manufacturer's power and installed-motor-weight limits; not every capacity plate lists a motor-weight limit. 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.

Are modern four-strokes heavier than the old two-strokes they replace?

Often, yes. Modern four-strokes typically carry more weight than the two-strokes they replace, though the gap varies a lot by family and vintage. That is exactly why the boat manufacturer's installed-motor-weight limit matters during a repower: check it before you buy, and if your hull is older or light, ask us to confirm the transom can carry the modern equivalent.

How much does a 40 hp Mercury outboard weigh?

The 40 HP Mercury FourStroke EFI weighs 98 kg (216 lb) dry in its lightest 3-cylinder configuration. Longer shafts and rigging add weight on top of that. For the exact figure on the model you are repowering, call Harris Boat Works at 905-342-2153.

How much does a 50 hp Mercury outboard weigh?

The 50 HP Mercury FourStroke EFI weighs 112 kg (247 lb) dry for the lightest model. The 50 and 60 HP share the same powerhead, so they weigh the same; Command Thrust versions run a few pounds heavier.

How much does a 200 hp Mercury outboard weigh?

It depends on the family. The 200 HP FourStroke (3.4L V6) is 215 kg (475 lb) dry, while the 200 HP Pro XS (4.6L V8) is 232 kg (511 lb), using the brochure's listed configurations; confirm the exact model and shaft before ordering. Check your capacity plate before repowering.

How much does a 300 hp Mercury outboard weigh?

The 300 HP Mercury FourStroke V8 is 239 kg (527 lb) dry, and the 300 HP Pro XS V8 is lighter at 232 kg (511 lb), both for the lightest configuration. Longer shafts and rigging add weight.

Mercury Outboard Weight Chart 2026: 2.5–300 HP Dry Weights

Quick answer Mercury outboards range from 19 kg (41 lb) for the 2.5 and 3.5 HP portables to 239 kg (527 lb) for the 250 and 300 HP V8 FourStroke, with the 75, 90, and 115 sharing the same 2.1L block at 163 kg (359 lb). All figures are Mercury's published dry weight for the...

Harris Boat Works technician inspecting a Mercury outboard in the Gores Landing service shop.

Last reviewed: 2026-09-11

Mercury Premier Dealer·Gores Landing, ON·Quote builder available

Quick answer

Mercury outboards range from 19 kg (41 lb) for the 2.5 and 3.5 HP portables to 239 kg (527 lb) for the 250 and 300 HP V8 FourStroke, with the 75, 90, and 115 sharing the same 2.1L block at 163 kg (359 lb). All figures are Mercury's published dry weight for the lightest configuration; longer shafts, Command Thrust gearcases, and rigging add weight.

Motor-weight planning: identify the exact configuration, account for the complete installation, and confirm hull limits.

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.

This chart covers the FourStroke and Pro XS families we sell and install every week. Verado is special-order territory at HBW and its weights vary significantly by model and rigging; if you are considering a Verado, verify the exact model number against Mercury's spec sheet.

FourStroke dry weights

HP	Dry weight (lightest model)	Notes
2.5 / 3.5	19 kg (41 lb)	Tiller portables
4 / 5 / 6	26 kg (57 lb)	Shared single-cylinder platform
9.9 EFI	38.5 kg (85 lb)	Command Thrust: 45 kg (100 lb)
9.9 ProKicker	55 to 57 kg (121 to 126 lb)	Kicker-duty gearcase and controls; range covers ProKicker variants
15 EFI	45 kg (99 lb)
20 EFI	45 kg (99 lb)
25 EFI	60 kg (132 lb)
30 EFI	66 kg (145 lb)
40 EFI	98 kg (216 lb)	3-cylinder; the 4-cylinder 40 is 118 kg (260 lb)
50 EFI	112 kg (247 lb)
60 EFI	112 kg (247 lb)	Command Thrust runs a couple of kg (a few pounds) heavier
75	163 kg (359 lb)	Shares 2.1L block with 90/115
90	163 kg (359 lb)	Command Thrust: 165 kg (363 lb)
115	163 kg (359 lb)	Command Thrust: 165 kg (363 lb)
135 / 150	206 kg (455 lb)	3.0L inline-4
175 / 200	215 kg (475 lb), dated brochure reference	3.4L V6; confirm exact configuration
225	Confirm exact model specification	3.4L V6; do not infer weight from the 175/200 row
250 / 300	239 kg (527 lb)	4.6L V8

The 175/200 FourStroke reference is from Mercury brochure 8M0189529 (May 2022), PDF page 10. It is not a guarantee for every current model or shaft. Confirm the exact ordered motor.

Pro XS dry weights

HP	Dry weight (lightest model)	Notes
115	163 kg (359 lb)	Same as the standard 115; Mercury calls it the lightest performance 115 in class
150	207 kg (456 lb)	3.0L
175	216 kg (475 lb)	3.4L V6; confirm the exact configuration
200 / 225 / 250 / 300	232 kg (511 lb)	4.6L V8; confirm shaft, gearcase and control configuration

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. The Pro XS V6/V8 figures follow Mercury Pro XS brochure 8M0189590, specification table. Treat these as configuration-dependent reference figures, not a guaranteed installed weight or a substitute for the exact model specification. See Mercury Marine official specifications and confirm the ordered model with HBW.

Dry weight is not installed weight. Mercury's dry weight excludes the propeller, fluids, battery cables, controls, and rigging hardware. The real load on your transom once the motor is installed and rigged is meaningfully higher than the chart number, so leave margin when comparing against your capacity plate's maximum motor weight.

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.

Harris Boat Works: family-owned on Rice Lake since 1947.

Frequently Asked Questions

How much does a Mercury 115 four-stroke weigh?: Mercury lists the 115 FourStroke at 163 kg (359 lb) dry for the lightest model; the Command Thrust version is 165 kg (363 lb). The 115 Pro XS is also 163 kg (359 lb). Longer shaft lengths add weight.
How much does a 90 hp Mercury outboard weigh?: 163 kg (359 lb) dry for the lightest model, or 165 kg (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 163 kg (359 lb), which Mercury says is the lightest performance 115 in its class by roughly 9 kg (20 lb). The standard 115 FourStroke is the same 163 kg (359 lb) in its lightest configuration.
How much does a Mercury 250 weigh?: Depends on the family: the 250 Pro XS V8 is 232 kg (511 lb) dry, while the 250 FourStroke V8 is 239 kg (527 lb), using the brochure's listed configurations; confirm the exact model and shaft before ordering.
Why does outboard weight matter when repowering?: Check the boat manufacturer's power and installed-motor-weight limits; not every capacity plate lists a motor-weight limit. 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.
Are modern four-strokes heavier than the old two-strokes they replace?: Often, yes. Modern four-strokes typically carry more weight than the two-strokes they replace, though the gap varies a lot by family and vintage. That is exactly why the boat manufacturer's installed-motor-weight limit matters during a repower: check it before you buy, and if your hull is older or light, ask us to confirm the transom can carry the modern equivalent.
How much does a 40 hp Mercury outboard weigh?: The 40 HP Mercury FourStroke EFI weighs 98 kg (216 lb) dry in its lightest 3-cylinder configuration. Longer shafts and rigging add weight on top of that. For the exact figure on the model you are repowering, call Harris Boat Works at 905-342-2153.
How much does a 50 hp Mercury outboard weigh?: The 50 HP Mercury FourStroke EFI weighs 112 kg (247 lb) dry for the lightest model. The 50 and 60 HP share the same powerhead, so they weigh the same; Command Thrust versions run a few pounds heavier.
How much does a 200 hp Mercury outboard weigh?: It depends on the family. The 200 HP FourStroke (3.4L V6) is 215 kg (475 lb) dry, while the 200 HP Pro XS (4.6L V8) is 232 kg (511 lb), using the brochure's listed configurations; confirm the exact model and shaft before ordering. Check your capacity plate before repowering.
How much does a 300 hp Mercury outboard weigh?: The 300 HP Mercury FourStroke V8 is 239 kg (527 lb) dry, and the 300 HP Pro XS V8 is lighter at 232 kg (511 lb), both for the lightest configuration. Longer shafts and rigging add weight.

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

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