A 90 HP to 115 HP Pro XS Command Thrust repower on a 17-foot fiberglass bass boat typically runs $17,000–$20,000 all-in at Harris Boat Works in Gores Landing. That covers the new Mercury 115 Pro XS Command Thrust, removal of the old 90 HP FourStroke, new digital or mechanical controls, propeller selection, and a full water test on Rice Lake. Timeline is 3–4 weeks. This is the upgrade owners pick when they want tournament-grade hole shot and more top end out of a boat they already love.
Last reviewed: 2026-05-24
Quick answer: A 90 HP to 115 HP Pro XS Command Thrust repower on a 17-foot fiberglass bass boat typically runs $17,000–$20,000 all-in at Harris Boat Works in Gores Landing. That covers the new Mercury 115 Pro XS Command Thrust, removal of the old 90 HP FourStroke, new digital or mechanical controls, propeller selection, and a full water test on Rice Lake. Timeline is 3–4 weeks. Build a quote at mercuryrepower.ca.
A 90 HP to 115 HP Pro XS Command Thrust repower on a 17-foot fiberglass bass boat typically runs $17,000–$20,000 all-in at Harris Boat Works in Gores Landing. That covers the new Mercury 115 Pro XS Command Thrust, removal of the old 90 HP FourStroke, new digital or mechanical controls, propeller selection, and a full water test on Rice Lake. Timeline is 3–4 weeks. This is the upgrade owners pick when they want tournament-grade hole shot and more top end out of a boat they already love.
Key facts
- Old motor: Mercury 90 HP FourStroke (still running)
- New motor: Mercury 115 HP Pro XS Command Thrust
- Boat: 17-foot fiberglass bass / multi-species hull
- Cost range: $17,000–$20,000 CAD all-in
- Timeline: 3–4 weeks
- Power jump: 25 HP, roughly 28% more rated horsepower
- Warranty: Mercury Limited Warranty, confirmed at quote
- Deposit: $500 to hold the order
What was on the boat before?
The starting point is a 17-foot fiberglass bass or multi-species boat with a 90 HP Mercury FourStroke that still works fine. The motor is not the problem. The hull is. Modern fiberglass bass boats weigh more than the brochure pretends, once you load a kicker, a trolling motor, two batteries, a livewell, a cooler, and two anglers with tackle, the 90 is doing a lot of work just to plane.
Customers usually come in for service, not a repower, and start asking about a bigger motor halfway through coffee. The 90 hits the high 30s mph if the prop is right, but hole shot is the issue. By the time the boat is on plane, two boat lengths have gone by, not great on tournament starts or in tight rivers.
Why upgrade to a 115 Pro XS Command Thrust?
The 115 Pro XS Command Thrust is two motors in one decision. Pro XS is the attitude, sport-tuned intake, exhaust, and ECU calibration for stronger hole shot and quicker top-end response than a base FourStroke 115. Command Thrust is the gearcase, a larger-diameter torpedo with a bigger gearset and a higher-thrust prop, designed to push heavier hulls and shrug off load.
Together you get a motor that pulls a fully loaded 17-foot bass boat onto plane in about half the time the old 90 needed. Top end in this combo lands in the mid-50s mph on a clean hull with the right pitch. Fuel economy at cruise is comparable to the old 90 because the new motor isn't labouring.
The Command Thrust gearcase also handles trim and steering torque better when the boat is pushed hard in corners. For tournament anglers, that means more confidence in chop and tighter holes through wakes.
What did the job involve?
This is more rigging than a FourStroke-to-FourStroke swap. We confirm the transom plate rating and Coast Guard capacity plate, pull the old 90, inspect the transom skin and bracket, and mount the 115 Pro XS Command Thrust with a bigger bolt pattern in some cases. The Pro XS often runs digital throttle and shift (DTS), if the boat had mechanical controls, we either keep mechanical or upgrade to DTS depending on what the helm can carry.
Propeller selection takes care here. The Command Thrust gearcase uses a different prop spline than a standard 115, so we move through 2–3 pitch options on the water until the motor hits Mercury's WOT RPM band cleanly. We pick props in the 14-inch diameter range, with pitch in the 17–21-inch window depending on hull, load, and customer style.
Water test on Rice Lake confirms WOT RPM, listens for any rigging issue, and checks gauges. Pickup-only at Gores Landing, we don't ship or deliver.
What did it cost?
All-in lands between $17,000 and $20,000 CAD. The 115 Pro XS Command Thrust sits in the $15,000–$18,000 motor band, and the rigging, controls, prop set, removal, fuel system, and water test build the rest. A clean Mercury 90 FourStroke trade-in can take several thousand off depending on hours and year, fill the trade form and we email a CAD figure within one business day.
Financing is 7.99% APR over $10,000 on approved credit, 8.99% APR under $10,000. For full pricing context see our Mercury repower cost guide, or read more about Rice Lake repower work.
Frequently Asked Questions
- How long does a 115 Pro XS Command Thrust repower take?
- Typically 3–4 weeks from quote signing to water test pickup at HBW. The Pro XS family sometimes has a slightly longer parts window than a base FourStroke, so we set the timeline once we confirm motor availability.
- What is the difference between a 115 FourStroke and a 115 Pro XS?
- Same horsepower rating but different attitude. The Pro XS has tuned intake and exhaust, sport-tuned ECU, and stronger hole shot. The Command Thrust gearcase is a bigger torpedo with more bite, better for heavier hulls or higher loads.
- Will a 115 Pro XS fit on a 17-foot bass boat?
- On most 17-foot fiberglass bass and multi-species hulls rated 115 HP or higher, yes. We confirm the transom plate rating, dry weight allowance, and Coast Guard capacity plate before quoting. We never overpower a hull.
- Is there financing for this kind of repower?
- Yes. Over $10,000 the rate is 7.99% APR on approved credit. A $500 deposit holds the order. Full terms come through the quote and you confirm them before motor allocation.
Visit Harris Boat Works
Harris Boat Works · 5369 Harris Boat Works Rd, Gores Landing, ON K0K 2E0 · Phone (905) 342-2153 · Family-owned since 1947 · Mercury Platinum Dealer, selling Mercury since 1965.
We're the repower side of Harris Boat Works. When you book a Pro XS job, the Harris Boat Works service team on Rice Lake is the same crew that rigs and water-tests the motor before pickup.
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