Mercury FourStroke 20hp EFI 15in Short Shaft Tiller Outboard Motor
Details
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Product Info
Product Info
Compact, powerful, and engineered for total control, the Mercury FourStroke 20hp EFI 15" Short Shaft Tiller Outboard Motor delivers exceptional performance in a lightweight design. Coming in 12% lighter than the previous generation, it’s easier to carry, install, and manoeuvre at the boat ramp, while updated internal components reduce powerhead vibration by up to 30%, giving you smoother operation and improved driving comfort.
With Battery-Free EFI, you get instant, reliable starting without needing a separate battery — perfect for boats where space and simplicity are key. At the heart of this motor is Mercury’s 333cc twin-cylinder FourStroke powerhead, using a low-friction SOHC design, oversized intake valves, and decompression relief to deliver strong torque, crisp throttle response, and easy manual starting.
The fully adjustable ambidextrous tiller offers unmatched comfort and flexibility, letting you customise horizontal and vertical positioning, steering resistance, and throttle direction to match your style. Mercury’s advanced Engine Guardian system continuously tracks temperature, RPM, oil pressure, and engine health, providing visual and audible alerts while automatically reducing RPM to protect the engine when needed.
With the Two-Stage rubber motor mount system, vibrations are significantly dampened before they reach the tiller, contributing to a smoother ride. When the day’s done, the built-in freshwater flush port makes maintenance simple — just connect a garden hose to wash out salt, sand, and debris with no disassembly required.
For boaters who want responsive power, exceptional efficiency, and unmatched user control, the Mercury 20hp EFI Short Shaft is a standout performer. With Mercury’s 3+3 year non-declining warranty, it’s built for years of reliable, stress-free adventures on the water.
Features
- Powerful 333cc twin-cylinder SOHC powerhead with oversized intake valves and decompression relief
- Battery-Free EFI for reliable manual starting and improved portability
- Lightweight build — 12% lighter than the previous model for easier lifting and handling
- Refined crankshaft, drivetrain, and mid-section for reduced vibration and smoother operation
- Fully adjustable ambidextrous tiller with reversible throttle grip and forward shift lever
- Engine Guardian system providing visual, audible and RPM-reduction alerts
- Two-Stage rubber motor mounts engineered to reduce tiller vibration for smoother operation
- Built-in freshwater flush port for simple garden-hose cleaning with no disassembly
- Maintenance schedule decal with 100/300-hour intervals and QR code for quick servicing info
- Backed by Mercury’s 3+3=6 year non-declining warranty for lasting confidence on the water
Product Overview
From the second you hit the start to the moment you open it right up, EFI on Mercury outboards dishes out instant, reliable power. Cold mornings, hot arvos — doesn’t matter. You get smooth starts, crisp acceleration, and a whole lot of fun every time you hit the throttle.
Battery-free EFIHead out without lugging around a cranking battery. Battery-free EFI on manual-start models gives you confident, reliable starting and the freedom to stay lightweight and portable — perfect for exploring new water.
Corrosion ResistanceBuilt to take on the harshest marine conditions, Mercury FourStroke outboards come armed with corrosion-fighting tech from top to bottom. We’re talking advanced alloys, tough-as-nails protective coatings, sealed electronics to keep the nasties out, and an easy freshwater flush system to rinse everything clean after a big day on the water. Premium protection that keeps your motor running stronger for longer.
Advanced tillerSet it up your way. Mercury’s adjustable tiller puts all the controls right where you need them, with options for left- or right-handed operation on select models. Comfortable, natural steering that keeps you in charge of every adventure.
Easy portabilityLightweight, simple to mount, and built for fun. Mercury’s 2.5–20hp four-stroke range lets you take the good times anywhere — from the tinny on the river to the tender behind the cruiser.
Convenient MaintenanceMercury makes the upkeep easy as. A no-spill oil change system, easy-out fuel filter, and a lifetime maintenance-free valve train all help keep you on the water longer and out of the shed.
Mercury 3 + 3 = 6 year warranty
When you purchase a brand-new Mercury Outboard from an authorised dealer, you’re covered by a massive 3+3 year warranty. That includes a bonus extra 3 years, factory-backed, with the same comprehensive coverage as Mercury’s standard 3-year manufacturer’s warranty — labour excluded — for any failures caused by defects in materials or workmanship. And good news: if you pass the motor on, any unexpired warranty can be transferred to the next owner as long as the product is properly re-registered.
Bonus Warranty Conditions
- The dealer must complete and document the official Mercury Marine pre-delivery inspection. Warranty only kicks in once the dealer has correctly registered your outboard.
- All servicing, maintenance, and repairs must be carried out by a factory-authorised Mercury dealer, and logged with Mercury.
- Stick to the recommended service intervals and maintenance schedule from the date of purchase.
- Only use genuine Mercury parts, oils, and lubricants.
- Make sure each service is recorded in your logbook and registered online by your authorised dealer.
Maintenance Schedule
First 3 Month Inspection3 months from date of sale or 20 hours for use - whichever occurs first. This post sale inspection will ensure everything is operating as required on your new engine. Even if your engine has only been used for a few hours, it is important to get this inspection done by the due date.
Annual InspectionOnce a year or every 100 hours of use - whichever occurs first.
Tech Spec
| 9.9HP SHORT SHAFT | 9.9HP LONG SHAFT | 15HP SHORT SHAFT | 15HP LONG SHAFT | 20HP SHORT SHAFT | 20HP LONG SHAFT | |
|---|---|---|---|---|---|---|
| HORSE POWER | 9.9HP | 3.5HP | 3.5HP | 3.5HP | 4HP | 5HP |
| SHAFT LENGTH | 15" | 20" | 15" | 20" | 15" | 20" |
| TRANSOM BRACKET TO CAVITATION PLATE MEASUREMENT | 17" 434mm | 22" 561mm | 16" 413mm | 22" 561mm | 16" 413mm | 22" 561mm |
| SUITS TRANSOM HEIGHTS | 15-17.5" 381-445mm | 19-22.5" 483-572mm | 15-17.5" 381-445mm | 19-22.5" 483-572mm | 15-17.5" 381-445mm | 19-22.5" 483-572mm |
| CAPACITY/CYLINDERS | 209CC / 2cyl | 209CC / 2cyl | 333CC / 2cyl | 333CC / 2cyl | 333CC / 2cyl | 333CC / 2cyl |
| MAX RPM AT FULL THROTTLE | 5000-6000 | 5000-6000 | 5700-6200 | 5700-6200 | 5700-6200 | 5700-6200 |
| COOLING SYSTEM | Water-cooled with thermostat | |||||
| STARTING | Manual | |||||
| FUEL SYSTEM | Electronic Fuel Injection (EFI) | |||||
| FUEL TYPE | Regular Unleaded | |||||
| FUEL TANK | External 12L | |||||
| GEAR RATIO | 2.08:1 | 2.08:1 | 2.15:1 | 2.15:1 | 2.15:1 | 2.15:1 |
| CONTROL & GEAR SHIFT | Tiller with shift in handle / F-N-R | |||||
| MOUNT STYLE | Thumbscrew | |||||
| TRIM/TILT | Manual- 5 position | Manual- 5 position | Manual- 5 position | Manual- 6 position | Manual- 6 position | Manual- 6 position |
| PROPELLOR | 3 blade aluminium | |||||
| WEIGHT | 38.1kg | 38.1kg | 45kg | 46.7kg | 46.7kg | 48.5kg |
| WARRANTY | 3+3=6 | |||||