Mercury FourStroke 9.9hp EFI 20in Long Shaft Tiller Outboard Motor
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Product Info
Product Info
When you’re looking for the perfect balance of power, control, and extended reach, the Mercury FourStroke 9.9hp EFI 20" Long Shaft Tiller Outboard Motor delivers in every way. Lightweight at just 38.4kg, it’s easy to carry and mount using the built-in ergonomic handles and rear grips — perfect for sailboats, inflatables, and small fishing craft that need the extra reach of a long shaft. Despite its compact footprint, this outboard is packed with smart technology that makes boating simpler, smoother, and more efficient than ever.
At its core, the 209cc twin-cylinder long-stroke engine produces strong low-end torque and quick throttle response, making it easy to get on plane and maintain steady performance. Mercury’s advanced electronic fuel injection (EFI) system automatically optimises air/fuel mix and ignition timing to suit your conditions — from cold starts to changing altitudes — with no choke or priming needed. The result is effortless starting, cleaner running, and up to 27% better fuel economy than the previous generation, so you can spend more time exploring and less time refuelling.
Control is made simple through Mercury’s multi-function tiller handle, designed for one-handed operation of shifting, throttle, and tilt adjustments. Integrated features like the stop button, safety lanyard, and friction control offer total command in any situation, while the ratcheting manual tilt clamp bracket adds versatility with six trim positions, full tilt lock, automatic angle reset, and three memory locks for repeatable setup every time.
Engineered for durability, this outboard features Mercury’s aluminum-silicon alloy construction and industry-leading coating process to provide superior corrosion resistance — the same protection found on Mercury’s larger models. Built-in low oil pressure warning and over-rev protection systems keep your motor running safely by preventing damage and alerting you early to potential issues.
Designed for performance, portability, and long-term reliability, the Mercury FourStroke 9.9hp EFI Long Shaft gives you everything you need to take your small boat or sailboat further. Backed by Mercury’s 3+3 non-declining warranty, it’s built to perform season after season — giving you big-engine confidence in a compact, easy-handling design.
Features
- Compact 209cc twin-cylinder powerhead provides strong low-end torque and quick throttle response
- Battery-free manual start EFI system automatically adjusts air/fuel mix and timing for optimal performance
- EFI system delivers faster acceleration from 0–15 mph and slightly higher top speed for enhanced performance
- Up to 27% improved fuel economy compared to previous models for longer run times and lower operating costs
- Lightweight 38.4kg design with ergonomic handles and rear grips for easy transport and mounting
- Exclusive ratcheting manual tilt clamp bracket with six trim positions, full tilt lock, and memory locks for secure adjustment
- Multi-function tiller handle for one-handed gear shifting, throttle control, tilt, and trim adjustments
- Advanced corrosion resistance with Mercury’s aluminum-silicon alloys and industry-leading coating process
- Built-in low oil pressure warning and over-rev protection to safeguard the engine and alert the operator
- 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 | |||||