Mercury FourStroke 15hp EFI 20in Long Sharf Tiller Outboard Motor
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Product Info
Product Info
Built for power, comfort, and total confidence on the water, the Mercury FourStroke 15hp EFI 20" Long Shaft Tiller Outboard Motor delivers exceptional performance in a lightweight, easy-to-handle package. At 12% lighter than the previous generation, this motor is easier to lift, mount, and manoeuvre, while the refined crankshaft and drivetrain help reduce powerhead vibration by up to 30%, giving you a smoother, more enjoyable ride.
The battery-free EFI system provides instant, reliable starting without the need for a dedicated battery, making it ideal for tinnies, tenders, and compact boats where space and simplicity matter. Mercury’s advanced 333cc twin-cylinder FourStroke powerhead delivers impressive torque with its low-friction SOHC design and oversized intake valves, while decompression relief ensures effortless manual starting every time.
Comfort and control are a standout thanks to the fully adjustable ambidextrous tiller, allowing both left- and right-handed operation with ease. Combined with the Two-Stage rubber motor mount system, which isolates vibration before it reaches the tiller, handling feels smooth and precise even at higher RPM.
Mercury’s Engine Guardian provides peace of mind by continuously monitoring temperature, oil pressure, RPM, and faults — alerting you with visual and audible warnings while automatically reducing RPM to protect the engine. After a day on the water, the built-in freshwater flush port makes maintenance quick and simple, helping extend engine life without the need for disassembly.
Lightweight, efficient, and packed with smart design features, the 15hp EFI Long Shaft offers best-in-class performance for boaters who want reliability, responsiveness, and comfort in all conditions. Backed by Mercury’s 3+3 year non-declining warranty, it’s built to deliver years of worry-free boating.
Features
- Robust 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 handling
- Refined crankshaft, drivetrain, and mid-section for reduced vibration and smoother operation
- Ambidextrous tiller with adjustable horizontal/vertical positioning and reversible throttle grip
- Engine Guardian system with visual, audible, and RPM-reduction alerts for added protection
- Two-Stage rubber motor mounts designed to significantly reduce vibration to the tiller
- Built-in freshwater flush port for quick, tool-free maintenance
- Maintenance schedule decal with 100/300-hour intervals and QR code for easy 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 | |||||