Mercury 300XL FourStroke Outboard Motor

The Mercury 300XL FourStroke is a used 300 hp V8 built around mechanical, cable-actuated controls instead of a digital setup, on a 25-inch shaft. Its 4.6-liter, 279 cid block carries 32 valves over dual overhead cams and climbs toward full throttle somewhere between 5200 and 6000 rpm.

Who should buy this version

Pick it when your helm already runs remote mechanical steering and throttle gear, because that is what this powerhead is set up for; a matching control box is sold on its own. The 25-inch shaft calls for a taller transom than a short-leg motor in the same family would need.

Specs that affect day-to-day use

Dry weight comes in at 527 lbs on a conventional mid-section, with a long-runner intake tuned for consistent power rather than outright top end. The gearcase ratio sits at 1.75:1, trim travels through a 20-degree range, and an 85-amp alternator covers electronics even when the throttle is barely open.

Will my current controls work with this engine? Yes, it is built for remote mechanical controls, not digital throttle and shift.

What steering ships with it? None; hydraulic and power steering kits are both sold separately.

This used engine's maintenance log is worth a look before you buy. Coverage adds up to 5 years altogether: 3 standard, extended by 2 further years of Product Protection Gold.