A 175 HP to 200 HP Pro XS V8 4.6L repower with Mercury Boost on a 24-foot tritoon typically runs $22,000–$26,000 all-in at Harris Boat Works in Gores Landing. That covers the new 200 Pro XS, the Boost option (25 HP on-demand for 4–6 seconds), removal of the old 175 V6, digital controls, prop selection, and a water test on Rice Lake. Timeline is 4–5 weeks. This is the most common Boost retrofit we do, heavy tritoons that need an easier time getting on plane with a full load.
Last reviewed: 2026-05-24
Quick answer: A 175 HP to 200 HP Pro XS V8 4.6L repower with Mercury Boost on a 24-foot tritoon typically runs $22,000–$26,000 all-in at Harris Boat Works in Gores Landing. That covers the new 200 Pro XS, the Boost option (25 HP on-demand for 4–6 seconds), removal of the old 175 V6, digital controls, prop selection, and a water test on Rice Lake. Timeline is 4–5 weeks. Build a quote at mercuryrepower.ca.
A 175 HP to 200 HP Pro XS V8 4.6L repower with Mercury Boost on a 24-foot tritoon typically runs $22,000–$26,000 all-in at Harris Boat Works in Gores Landing. That covers the new 200 Pro XS, the Boost option (25 HP on-demand for 4–6 seconds), removal of the old 175 V6, digital controls, prop selection, and a water test on Rice Lake. Timeline is 4–5 weeks. This is the most common Boost retrofit we do, heavy tritoons that need an easier time getting on plane with a full load.
Key facts
- Old motor: 175 HP V6 FourStroke
- New motor: Mercury 200 HP Pro XS V8 4.6L with Boost
- Boost gives 25 extra HP on demand for 4–6 seconds
- Boat: 24-foot tritoon
- Cost range: $22,000–$26,000 CAD all-in
- Timeline: 4–5 weeks
- Boost cost add: ~$1,200–$1,800 over base motor
- Deposit: $1,000 for big-block / Pro XS
What was on the boat before?
The classic Boost retrofit candidate is a 24-foot tritoon (three logs, full furniture package, bimini, big fuel tank) with a 175 HP V6 FourStroke that came on the boat 5 to 8 years ago. The motor runs. It's well maintained. The owner has had it serviced at HBW since launch.
The issue is the way the boat behaves on a Saturday in July with eight adults, a cooler, water toys, and a full tank. The 175 plows. Hole shot takes 8–12 seconds depending on load, and the boat sits at a nose-high attitude longer than anyone enjoys. Once on plane the cruise is fine. It's the getting-there that turns into a conversation.
Why upgrade to a 200 Pro XS V8 with Boost?
The 200 Pro XS V8 4.6L is the natural upgrade. The 4.6-litre block is the same physical motor as the 250 and 300 in that family, just tuned differently, which means you get a lot of motor for the HP rating. The V8 has more low-end torque than the older V6, which is exactly what a heavy pontoon needs.
Boost is the part that makes the math work. Press the button on the throttle and the motor delivers 25 extra HP for 4–6 seconds. The whole feature is built around the hole shot. A 24-foot tritoon that took 10 seconds to plane with the old 175 will plane in 4–5 seconds on a 200 Pro XS with Boost engaged. Once the boat is on plane, the owner releases the button and cruises on the 200 HP base.
Because the boost is short-burst and warranty-safe, you get the practical benefit of a 225 HP motor on demand without the cost or fuel burn of running 225 all day. For a pontoon that does a lot of loaded family days, this is one of the best dollar-for-dollar upgrades Mercury sells.
What did the job involve?
A V6-to-V8 swap on a pontoon is more than a motor change. We confirm the transom rating, pull the old 175, inspect the transom and the motor pod, and mount the 200 Pro XS V8 with new hardware. Boost requires a Mercury smart helm setup, digital throttle, the right gauge, the harness, and the boost button mapped on the throttle handle. If the pontoon already had a Mercury smart helm, the upgrade is mostly harness and software. If not, we install a new helm package.
Propeller selection matters more on a pontoon than people expect. We try 2–3 stainless props in the 15.25-inch diameter range, with pitch in the 17–19-inch window, until WOT RPM lands in Mercury's spec band cleanly with and without Boost active. The right prop is the difference between Boost feeling like a press-and-go feature and Boost feeling subtle.
Water test on Rice Lake, both loaded and unloaded, before pickup. Pickup-only at Gores Landing, we don't ship or deliver.
What did it cost?
All-in lands between $22,000 and $26,000 CAD. The 200 Pro XS V8 motor sits in the $18,000–$22,000 band, Boost adds $1,200–$1,800, and rigging, controls, prop set, removal, and water test build the rest. A clean 175 V6 trade-in can take several thousand off, fill the trade form and we email a CAD number within one business day.
Financing is 7.99% APR over $10,000 on approved credit. A $1,000 deposit holds the order. See the Mercury repower cost guide for the broader pricing context, or read more about Rice Lake repower work.
Frequently Asked Questions
- What is Mercury Boost?
- Boost is a Mercury feature that delivers 25 extra horsepower on demand for 4–6 seconds at the press of a button. It is available on select Pro XS V8 4.6L models, 175, 200, and 225 HP. The most common use case is helping a heavy pontoon get on plane with a full load.
- How much does Boost add to the motor price?
- Boost typically adds $1,200–$1,800 to the base Pro XS V8 price, depending on rigging requirements. The full pontoon retrofit with motor, Boost, removal, controls, and water test lands in the $22,000–$26,000 all-in range.
- Does Boost work for the whole day or just hole shot?
- Boost is intentionally short-burst, 4–6 seconds at a time. It is designed for the hole-shot moment when a heavy boat is fighting to get on plane, or for a quick passing burst. It is not a continuous overboost, which is why the motor stays inside Mercury's warranty envelope.
- Will Boost work on my existing pontoon?
- Boost is only on select Pro XS V8 4.6L motors, 175, 200, and 225 HP. If your pontoon is rated for that HP range on the transom plate, the retrofit works. We confirm the rating before quoting. Pickup-only at Gores Landing.
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 in Gores Landing, Mercury Platinum Dealer, selling Mercury since 1965. Every Boost retrofit gets rigged and water-tested by the same techs who wrote the quote.
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