2021 Mercury Racing 300R V8 — 385 Hours, SportMaster, DTS

Condition report

Used 2021 Mercury Racing 300R in the heavy-duty configuration: 4.6L V8, SportMaster gearcase with 1.75:1 gearing, right-hand rotation, DTS digital throttle and shift, and a rear tie-bar / side-steer setup with cambered gearcase. The seller reports 385 hours and describes the motor as running flawless with no issues, and offers a sea trial with deposit on this unit. The gallery shows the actual motor as photographed — the black Racing 300 cowling on the transom, the rear tie-bar hardware, and the Latham steering ram in the workshop shot. Every Apex Marine engine is compression tested and supplied with warranty.

Overview

The 300R is Mercury Racing’s V8 answer to the high-performance single-engine boat: a 4.6-litre V8 built to turn a SportMaster gearcase hard, with DTS electronic throttle and shift doing away with cable stretch and vague lever feel. This 2021 example is the heavy-duty specification — rear tie-bar and side-steer hardware with a cambered SportMaster — the setup chosen for cats and performance vees that steer from the transom.

At 385 hours it sits in the sweet spot for a Racing motor: run-in, proven, and with the expensive break-in period long behind it. Prefer a lower-hour 300R? We also stock a 2020 Mercury Racing 300R with just 50 hours — the two listings let you choose between value and hours on the same V8 platform.

What’s included

• Mercury Racing 300R V8 outboard motor (actual unit photographed)
• SportMaster gearcase, 1.75:1, right-hand rotation
• DTS (Digital Throttle & Shift) configuration
• Heavy-duty rear tie-bar / side-steer setup as photographed
• Sea trial available with deposit on this unit (seller-stated)

Ideal for

Performance centre consoles, sport cats and fast bay boats on a 20-inch transom that want Racing V8 power with a heavy-duty steering setup already configured.

Compatibility notes

• Confirm your boat’s capacity plate: never exceed the maximum rated horsepower.
• Match shaft length to your transom height so the anti-ventilation plate runs at the correct depth.
• Confirm your transom and hull can support the engine’s weight.
• Controls, cables, gauges, steering components, and propellers are not included unless the listing states otherwise — we verify rigging compatibility with your boat before you buy.

Delivery

Units ship crated and fully insured. Mainland US transit is 3–5 business days; international 7–14 business days (quoted per order). Transit estimates exclude processing, customs, and carrier delays. See shipping, returns & warranty for full terms.

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