Mercury 4 HP 4MH Four-Stroke Outboard, 15" Shaft, Tiller
The Mercury 4MH is a 4 HP single-cylinder four-stroke outboard with a 15-inch short shaft, tiller throttle and shift, and manual start. It weighs 55 lbs, displaces 85 cc and runs 5,000–6,000 RPM at full throttle.
Exhaust leaves through the propeller for quieter running, and the motor suits aluminum tiller boats, soft-hull inflatables, jon boats, utility boats and sailboats. Trim and tilt are manual and rotation is standard. Included are a 7.4 x 7.0-inch three-blade composite propeller, integrated carry handle, safety lanyard stop switch, 0.3-gallon internal fuel tank, tool kit and owner's manual, in Phantom Black.
Highlights
4 HP single-cylinder four-stroke, 85 cc
15" short shaft, tiller, manual start
Through-prop exhaust
55 lbs with integrated carry handle
0.3-gallon internal fuel tank
7.4" x 7.0" three-blade composite propeller included
Specifications
Brand | Mercury |
Model | 4MH |
MPN | 1F04201KK |
Horsepower | 4 HP |
Engine Type | Inline 1, four-stroke |
Cylinders | 1 |
Shaft Length | 15" (Short) |
Throttle Control | Tiller handle |
Starting | Manual |
Trim & Tilt | Manual |
Rotation | Standard |
Weight | 55 lbs |
Full Throttle Range | 5,000–6,000 RPM |
Displacement | 85 cc (5.2 ci) |
Fuel Induction System | 2-valve pushrod (overhead valve) |
Propeller | 7.4" x 7.0" 3-blade composite |
Fuel Tank | Internal, 0.3 gal |
Good to know
Confirm shaft length, controls and propeller rotation against your boat before ordering, and stay within the maximum horsepower on the boat's capacity plate.
Installation, rigging and commissioning by a qualified marine technician are recommended; follow the manufacturer's pre-delivery and break-in procedures.

