$3,585.00
HP four-stroke, 333cc inline two-cylinder engine
15″ short shaft with multi-function tiller
Battery-free Electronic Fuel Injection (EFI) for reliable starts
Lightweight at 103 lbs with low-vibration mounts
3.2-gallon external fuel tank
Corrosion-resistant for freshwater/saltwater use
Manual start with decompression system
Tiller locks at 73 degrees for fishing/trailering
The Mercury 20MH is a lightweight, four-stroke outboard motor engineered for small to medium boats, including jon boats, skiffs, inflatables, and small fishing vessels up to 14-16 feet. Featuring a 15-inch short shaft, it weighs 103 lbs, making it one of the lightest in its 20 HP class. The 333cc (20.3 cubic inch) inline two-cylinder engine with Electronic Fuel Injection (EFI) delivers powerful low-end torque for rapid planing and a full throttle range of 5700-6200 RPM. Its innovative multi-function tiller handle adjusts 18 degrees port or starboard, is reversible for left- or right-hand use, and locks at 73 degrees for fishing or trailering, offering exceptional control. The motor includes a 3.2-gallon external fuel tank, battery-free EFI for reliable manual starts, and low-vibration wishbone mounts for smooth operation. Built for durability in freshwater and saltwater, it features low-copper aluminum alloys, stainless steel components, and a multi-layered priming and painting process for superior corrosion resistance. The Mercury 20MH offers quick acceleration, fuel efficiency, and easy operation for worry-free boating.
| Engine | 4-stroke, SOHC | Inline 2-cylinder | 333cc / 20.3 cu in | 20 HP @ 5700-6200 RPM | EFI, 4-valve | Digital CD ignition | Water-cooled |
| Shaft | 15″ short | Corrosion-resistant | 9.2″ x 9.1″ 3-blade prop | Shallow water drive | 16° trim range | Standard rotation | Salt/freshwater rated |
| Controls | Multi-function tiller | Manual start | Adjustable throttle | 18° tiller adjustment | 73° tiller lock | Safety lanyard | Engine alert system |
| Charging | 12 amps / 145 watts | Low-speed charging | Regulated charging | Supports electronics | Optional alternator | Maintenance-free | No battery required |
| Weight | 103 lbs / 47 kg | Lightweight design | Balanced weight | Portable for class | Minimal drag | Easy transport | Transom mount |
| Performance | 5700-6200 RPM range | Fuel-efficient | Low emissions | High torque | ~1.69 gph @ 5500 RPM | Quiet operation | Top speed 20-22 mph |
| Compatibility | 14-16 ft boats | Jon boats, skiffs | Inflatables | 3.2-gal external tank | Aluminum prop | Salt/freshwater rated | Tiller steer boats |
| Dimensions | 15″ shaft length | 16.2″ W | 39.8″ H | 26.1″ L | Corrosion-resistant | Transom mount | Manual tilt |
| Engine | 4-stroke, SOHC | Inline 2-cylinder | 333cc / 20.3 cu in | 20 HP @ 5700-6200 RPM | EFI, 4-valve | Digital CD ignition | Water-cooled |
| Shaft | 15″ short | Corrosion-resistant | 9.2″ x 9.1″ 3-blade prop | Shallow water drive | 16° trim range | Standard rotation | Salt/freshwater rated |
| Controls | Multi-function tiller | Manual start | Adjustable throttle | 18° tiller adjustment | 73° tiller lock | Safety lanyard | Engine alert system |
| Charging | 12 amps / 145 watts | Low-speed charging | Regulated charging | Supports electronics | Optional alternator | Maintenance-free | No battery required |
| Weight | 103 lbs / 47 kg | Lightweight design | Balanced weight | Portable for class | Minimal drag | Easy transport | Transom mount |
| Performance | 5700-6200 RPM range | Fuel-efficient | Low emissions | High torque | ~1.69 gph @ 5500 RPM | Quiet operation | Top speed 20-22 mph |
| Compatibility | 14-16 ft boats | Jon boats, skiffs | Inflatables | 3.2-gal external tank | Aluminum prop | Salt/freshwater rated | Tiller steer boats |
| Dimensions | 15″ shaft length | 16.2″ W | 39.8″ H | 26.1″ L | Corrosion-resistant | Transom mount | Manual tilt |
High-Performance Engine: 333cc inline two-cylinder engine with EFI and a 4-valve SOHC design provides strong torque, quick acceleration, and fuel efficiency for small to medium boats.
Innovative Tiller: Multi-function tiller adjusts 18 degrees port/starboard, offers reversible throttle grip rotation, and locks at 73 degrees for fishing or trailering, ensuring ergonomic, ambidextrous control.
Lightweight Design: At 103 lbs, it’s among the lightest 20 HP outboards, enhancing portability and minimizing drag on small vessels.
Reliable Starting: Battery-free EFI and decompression system ensure easy manual starts in all conditions, with instant throttle response for smooth operation.
Corrosion Resistance: Low-copper aluminum alloys, stainless steel water pump housing, zinc-coated passages, and sacrificial anodes ensure durability in harsh marine environments.
Smooth Operation: Wishbone mounts and tuned intake reduce vibration, while a through-propeller-hub exhaust minimizes noise for a comfortable ride.
Fuel Efficiency: EFI optimizes fuel delivery, paired with a 3.2-gallon external tank for extended range, using 87-octane fuel with up to 10% ethanol; consumes ~1.69 gph at 5500 RPM.
Safety Features: Engine alert system monitors low oil pressure, overheating, over-revving, and sensor failure, with a safety lanyard for emergency stops.
How Does Shipping Work and How Long Does It Take?
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Order Processing & Shipping Times
Orders are processed and shipped within 2-5 business days (excluding weekends and holidays). All items are delivered within 10 business days from the date of shipment. As your delivery date nears, the shipper will contact you to coordinate a seamless drop-off.
Before ordering, please verify your shipping address to prevent delays. Your satisfaction is our priority, and we’re committed to making your shopping experience smooth and enjoyable. Have questions? Email us at sales@faa-marine.com—we’re here to help!
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6 reviews for Mercury 20hp 15″ Shaft | 20MH
Running this Mercury on a 15′ aluminum skiff around Lake Tahoe. Super reliable little engine, barely sips fuel. I gave it 4 stars only because it’s a bit louder than I expected at full throttle — but nothing crazy.