
Tohatsu MFS9.9EEFS 9.9HP EFI Tiller Electric 15″
The Tohatsu MFS9.9EEFS utilizes a 333cc SOHC powerhead with electric start, built for short-transom fishing skiffs. It produces 9.9HP, charges at 12 Amps, and spins a 2.15:1 ratio, weighing 94.7 lbs.
- Battery-less EFI eliminates hard starting issues
- Short 15-inch shaft matches crabbing skiffs
- Weighs 94.7 lbs, optimizing shallow draft
The Tohatsu MFS9.9EEFS is a 9.9hp electric start tiller outboard engineered with a 15-inch short shaft configuration to fit small jon boats and short-transom aluminum skiffs. Harnessing a compact 0.33-liter 333cc inline 2-cylinder SOHC 4-valve powerhead provides an torque curve capable of pushing lightweight inflatable tenders cleanly across skinny water fishing configurations. At 94.7 lbs of dry weight, this engine adds substantial ballast stabilization to the stern while maintaining structural balance across 10-to-14-foot light crabbing boats.
Its 5400 to 6100 RPM range is how this portable engine sustains cruising speeds across long transport distances. The robust 2.15:1 gear ratio translates pure rotational power into immediate thrust to drive compact pitch propellers efficiently through shallow river currents. Engineered with dependable Japanese manufacturing reliability, this marine power plant undergoes exhaustive field testing to handle punishing everyday conditions year after year without failure.
Advanced Inline 2 Sport Portable Architecture
The 333cc inline 2-cylinder engine block configuration delivers thermal efficiency by optimizing combustion chamber heat dissipation during prolonged wide-open throttle operation. This specific propulsion platform maintains exceptionally stable operating temperatures through internal water jackets under severe utility vessel pressures.
Battery Less Electronic Fuel Injection
Battery-less electronic fuel injection systems inject precise fuel volumes directly into each cylinder to is designed to support crisp throttle response and a superior hole-shot acceleration profile. This engineering approach reduces overall consumption rates across variable cruising velocities on extended fishing trips over open inland wetlands.
Standard Rotation Mechanical Propulsion
Standard clockwise gearcase mechanics isolate steering torque entirely on light crabbing boats by rotating the prop cleanly along the central tracking alignment. This strategic balancing technique improves directional tracking stability dramatically when piloting across treacherous crosscurrent wind chops.
Short Transom Portable Boat Deployment
Short-transom aluminum skiffs and small jon boats utilize this short 15-inch shaft outboard to establish reliable tracking control in shallow water environments. The heavy power delivery provides planing speeds for long multi-passenger backwater transport trips.
Rigorous Portable Powerhead Maintenance Guidelines
A standard 5-year limited warranty backs this flagship portable platform to helps support comprehensive multi-season operational coverage. Saltwater marine propulsion units require consistent inspections to protect internal seals from hidden fishing line damage.Maintenance note: Follow the manufacturer’s service procedures and lubrication specifications for the engine and gearcase.
Product Specifications
Tohatsu MFS9.9EEFS 9.9HP EFI Tiller Electric 15" Specs
| Brand | Tohatsu |
|---|---|
| Full Model Code | MFS9.9EEFS |
| Country of Origin | Japan |
| Engine Family/Series | MFS EFI Sport Portable |
| Engine Type | Inline 2-Cylinder 4-Stroke SOHC 4-Valve |
| Displacement | 0.33 Liters / 333 cc |
| Horsepower | 9.9 HP / 7.3 kW |
| Full Throttle RPM Range | 5400 - 6100 RPM |
| Fuel Induction System | Battery-Less Electronic Fuel Injection (EFI) |
| Alternator Output | 12 Amps / 12V 145W |
| Gear Ratio | 2.15:1 |
| Shaft Length | S (15") |
| Dry Weight | 43 kg / 94.7 lbs |
| Bore x Stroke | 61.0 mm x 57.0 mm |
| Starting & Steering System | Electric Start (with Manual Recoil Backup) & Ergonomic Tiller Handle |
| Trim/Tilt Method | Manual Trim & Tilt (4 Open Positions & Shallow Water Drive) |
| Oil Capacity | 1.0 Liter (with filter) |
| Recommended Fuel | 87 Octane |
| Standard Warranty | 5 Years Limited |
| Application | Short-transom aluminum skiffs, light crabbing boats, small jon boats, skinny water fishing configurations, and inflatable tenders (10-14 ft hulls) |
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