Mercury 9.9MXLH Command Thrust FourStroke

This used Mercury 9.9MXLH Command Thrust FourStroke takes the 9.9 hp, two-cylinder powerhead and mounts it on a 25 inch extra-long shaft for taller transoms, with manual start and tiller steering.

Numbers that matter here

On a carbureted fuel system, this engine is geared 2.08:1 and tops out between 5000 and 6000 rpm at full throttle. Trim positions are ratcheting, and the remote tank Mercury specifies for this model holds 3.2 gallons, or 12 liters.

What to check before buying

This extra-long-shaft model calls for a 25 inch measurement at your transom; mounted at the wrong height, the motor will not trim correctly. Ask us to confirm the exact gearcase fitted on this particular unit before you buy.

Who it suits

Aluminum tiller, inflatable soft-hull, utility, jon, and sailboats with a taller transom, where the extra-long shaft is needed to keep the prop at the right depth.

Condition notes

Dry weight is listed at 84 lbs. As a used outboard, expect wear consistent with prior service; have it inspected and run before relying on it for the season.

Common questions

Is this manual or electric start? Manual pull-start, in line with the model name.

What cooling system does it use? Water-cooled with a thermostat, standard for this engine.

Is a propeller included? Yes, a propeller ships with this motor.