For most 16 to 18 ft aluminum console boats on Kawartha and Ontario freshwater, the Mercury 90 HP FourStroke is the practical sweet spot. The 75 suits lighter use; the 115 adds useful headroom for family loading and rougher water. The exact price gap changes with model,...
Quick answer: Mercury 75, 90 and 115 FourStroke models share a 2.1L block and Mercury-listed lightest dry weight. The right choice depends on the capacity plate, hull, normal passenger load, steering and gearcase configuration. The 90 is HBW's usual fit for many 16 to 18 ft aluminum console boats; confirm your boat before ordering.
For most 16 to 18 ft aluminum console boats on Kawartha and Ontario freshwater, the Mercury 90 HP FourStroke is the practical sweet spot. The 75 suits lighter use; the 115 adds useful headroom for family loading and rougher water. The exact price gap changes with model, rigging, and current promotions. If you're stepping up HP as part of a motor swap, the boat repower guide covers the rigging changes that go with each class. Compare current CAD pricing on the Mercury pricing reference, then build the exact configuration on the motor selection page.
Same block, three fits. The capacity plate sets the ceiling.
Which one is right for you?
- Boat under 18 ft, lighter aluminum → 75 FourStroke
- Bowrider or mid-size aluminum, family use → 90 FourStroke
- Heavier rig, fish-and-ski, pontoon, or want performance → 115 Pro XS
Is Upgrading From 75 to 90 HP Worth It?
For most 16 to 18 ft aluminum console boats carrying two or more people on Kawartha lakes, yes. The 90 gives you stronger loaded planing and acceleration on the same 2.1L block and mounting footprint. The exact speed gain depends on hull, load, prop, mounting height, and conditions, so we do not promise a fixed mph increase. If you mostly run light and single-handed, the 75 is a fine motor. If the boat fills up on weekends, the 90 is the one you are less likely to outgrow.
Real-world performance varies with hull, load, prop, mounting height, water conditions, and rigging. Numbers below are typical ranges from boats we've rigged at HBW; treat them as ballpark, not guarantees.
Quick recommendation
The 90 HP FourStroke sits in the useful middle of this group. On many 16 to 18 ft aluminum console boats, it adds loaded planing and acceleration over the 75 without automatically moving the buyer into the price and weight of the 115. The capacity plate, hull, normal load, current rigging, and performance goal still decide whether that middle answer is the right one.
When customers ask "75, 90, or 115?" we usually walk through three things: hull length, typical loading, and use case. The right answer comes out of those three. For most Ontario freshwater customers, the answer is 90. For lighter use on shorter hulls, the 75 is enough. For heavier loading or bigger water, the 115 earns the price difference.
What changes the answer
Five things move whether 75, 90, or 115 is right for your boat:
- Hull length and weight. A 16 ft aluminum at 90 HP feels different than a 18 ft fiberglass at 90 HP. Heavier hulls need more HP to plane reliably.
- Passenger and gear loading. Two-person fishing is one motor. Family of four with cooler, gear, and kids is another motor entirely.
- Where you launch. Sheltered Rice Lake bays vs. open Lake Ontario chop changes the practical HP minimum. Wind exposure punishes underpowering.
- Trolling vs. cruising emphasis. All three motors troll fine with a 9.9 ProKicker. The HP question is about cruising and run-back performance.
- Capacity plate maximum. Most boats in this size range are rated 75 to 115 HP or 90 to 150 HP. The plate sets the ceiling. We will not over-power.
Side-by-side: Mercury 75 vs 90 vs 115 FourStroke
For typical Ontario use on 16 to 18 ft aluminum console boats:
| Factor |
75 EXLPT FourStroke |
90 EXLPT FourStroke |
115 EXLPT FourStroke |
| Engine type |
Inline 4-cyl, 2.1L |
Inline 4-cyl, 2.1L |
Inline 4-cyl, 2.1L |
| Weight (XL shaft) |
~163 kg / 359 lb |
~163 kg / 359 lb |
~163 kg / 359 lb |
| Top speed (16 ft aluminum) |
~30 to 35 mph |
~35 to 40 mph |
~40 to 45 mph |
| Top speed (18 ft aluminum) |
~25 to 30 mph |
~30 to 35 mph |
~35 to 40 mph |
| Hole shot |
Adequate solo, soft loaded |
Strong solo, adequate loaded |
Strong loaded |
| Fuel economy at cruise |
Best of the three |
Excellent |
Slightly less than 90 |
| Best fit |
14 to 16 ft light aluminum |
16 to 18 ft aluminum console |
17 to 19 ft aluminum or light fiberglass |
| Use case |
Solo or two-person |
Family of three or four |
Family of four or five with gear |
| Tournament use |
No |
Marginal |
Yes (FourStroke) or step to Pro XS |
Note: top-speed numbers vary by hull design, prop selection, and loading. These are typical Kawartha-area lake-test results for representative aluminum console hulls. For your specific boat, lake-test numbers from HBW will be more accurate.
For specific pricing on each motor, build a quote.
75 HP Owners: When to Upgrade
You don't need to overthink this one. A 75 that felt fine when you bought it can start feeling small the moment the boat gets busier. Here's the honest read:
Signs your 75 is working too hard:
- It struggles to get on plane with three or more people aboard
- It can't hold a comfortable cruise in a one-foot chop
- You're running near wide-open just to keep up
What a 90 buys you on the same hull:
- Stronger acceleration and loaded planing
- Planes with a load instead of plowing
- Better resale when you eventually sell the boat
What doesn't change:
- Same 2.1L block and same 163 kg weight as the 75
- Same mounting footprint, so no transom surprises
The math most people miss: the difference between a 75 and a 90 is small money spread over a finance term, and it's a lot cheaper than buying the 75 now and trading up to the 90 in two summers. If you're on the fence, that second purchase is the expensive path.
Mercury 75 EXLPT FourStroke: when it fits
The 75 HP FourStroke is the right call when:
- Hull is 14 to 16 ft and lighter aluminum. Smaller hulls do not need 90+ HP for typical use.
- Use is solo or two-person fishing primarily. Lighter loading lets the 75 shine.
- Sheltered water, calm conditions. Rice Lake bays, smaller Kawartha lakes, sheltered cottage water.
- Budget is tight and the next class up does not justify the difference for your specific situation.
The 75 saves real money on a budget-tight repower. The downside shows up when the boat is loaded or when wind comes up. If you regularly run with a full crew or in choppy water, the 75 will leave you wishing for more.
Mercury 90 EXLPT FourStroke: the sweet spot
The 90 HP FourStroke is the right call when:
- Hull is 16 to 18 ft aluminum console. This is the most common Kawartha repower hull.
- Use is family fishing or mixed recreation. Two to four people, gear, mixed cruising and fishing.
- Capacity plate rating is 90 to 115 HP (very common range on this boat size).
- You want headroom without paying for HP you do not need.
The 90 is the most-installed Mercury in this class for a reason. It performs well across the most common use cases, promotional pricing shifts through the year so check our /promotions page, and the long-term ownership math (fuel economy, parts, resale) is favorable. The Mercury 90 EXLPT is the workhorse of the Canadian recreational fleet.
For the typical 16 to 18 ft aluminum console at HBW, the all-in repower cost changes with rigging and current Mercury pricing. Live pricing here.
Mercury 115 EXLPT FourStroke: when the step-up earns its price
The 115 HP FourStroke is the right call when:
- Hull is 17 to 19 ft aluminum or light fiberglass. Bigger hulls justify the bigger motor.
- Use is family of four or five with gear, or active fishing with multiple anglers.
- You launch on bigger water (Lake Simcoe, Lake Ontario, Bay of Quinte) or run the Trent-Severn system.
- Capacity plate rating is 115 HP or higher.
- You want the option of running Pro XS later (115 Pro XS slots into the same gearcase footprint as the 115 FourStroke).
The 115 step-up over the 90 is meaningful in real-world performance: better hole shot when loaded, better cruise speed, more headroom in chop. The price premium over the 90 is real but not enormous. Most customers who step up do not regret it. Most customers who buy 90 also do not regret it. There is no wrong answer if the boat fits both.
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Resale: horsepower can change who looks at the boat
When it comes time to sell, the transom horsepower plate can shape buyer interest. A well-matched, well-maintained motor usually helps more than a generic payback range. If you plan to keep the boat for many years, the upfront savings on a 90 might outweigh any later resale difference. If you trade more often, compare current written quotes and decide whether the extra performance is worth the extra spend while you own it. There is no universal resale payback figure.
What HBW checks before recommending 75, 90, or 115
When customers come in deciding between these three motors, we want to know:
- Boat make, model, year, length, and weight class
- Maximum HP rating on the capacity plate
- Typical passenger and gear loading
- Primary use case (fishing, family, mixed)
- Where you launch (sheltered vs. open water)
- Trolling-heavy or run-and-gun preference
- Existing prop and rigging condition
- Long-term ownership plan
- Budget and financing tolerance
The answer comes out of these. Most customers fall into "90 is the right call." Some fall into "75 is enough for what you do." Some fall into "the 115 will pay back the price difference in how the boat performs." We give the honest answer per boat.
Common 75/90/115 mistakes
We see these every season:
- Buying 75 to trim the price and regretting it. Customers who pick the 75 to cut budget often trade up to a 90 or 115 within 2 to 3 seasons. They paid the 75 price plus the trade-up cost. Should have bought the 90 the first time.
- Buying 115 when 90 was plenty. A 115 on a 16 ft aluminum used solo for fishing is overkill. The motor outpowers the hull's typical load. The savings on the 90 buy electronics, props, or kicker upgrades that matter more.
- Expecting a fixed mph gain. Hull, load, prop, mounting height, and conditions can move the result by several mph. Compare loaded planing, acceleration, and cruise behaviour on your boat instead of treating a broad lake-test range as a promise.
- Ignoring the prop. The right prop on a 75 sometimes outperforms a wrong prop on a 115. Prop selection is critical, and the verification scope follows the motor, hull, rigging, work order, and safe seasonal testing conditions.
- Skipping the kicker decision. The 9.9 ProKicker question is separate from the 75/90/115 question. Most fishing customers want a kicker regardless of which main motor.
Mercury 115 Pro XS: when to step up the family
In Mercury's current lineup, the Pro XS choice in this comparison begins at 115 HP. There is no current 75 or 90 Pro XS. The 115 Pro XS is tuned for stronger acceleration and a higher RPM range than the 115 FourStroke, so the family choice only enters once the hull is rated for 115 HP.
Pro XS is the right call when:
- Tournament-level performance is the priority.
- Bass boat or performance hull where acceleration matters.
- You want the fastest run-out to morning fishing spots.
For typical recreational use (fishing, family, mixed), FourStroke at the same HP is the better value. Pro XS earns the price difference on tournament hulls, not on family aluminum consoles. See our Mercury motor families guide for the full FourStroke vs Pro XS picture.
Ready to pick your motor?
Build a quote for 75, 90, or 115 HP on the motor selection page. Live Mercury pricing in CAD with full configuration including rigging and prop.
Build Your Mercury Quote
Pricing ranges in this article are HBW's working 2026 estimates, last reviewed 2026-08-19. The actual price for your specific motor and configuration is on the motor selection page, which is the source of truth and updates as Mercury pricing and HBW promotions change. Mercury model years change every July 1, and we refresh ranges in articles annually.
About the author
Jay Harris helps run Harris Boat Works, a third-generation family marina in Gores Landing on Rice Lake, established in 1947. HBW is a Mercury Marine Premier Dealer and Legend Boats dealer serving Rice Lake, the Kawarthas, and Ontario boaters who want straight answers before spending real money. Read Jay's full bio.
