Looking for a reliable outboard in the lightweight, high-portability range? Two of the top contenders are the Yamaha F15SMHA (15hp, short shaft, manual start, tiller) and the Tohatsu 9.9hp four-stroke. Both are known for reliability, fuel efficiency, and easy handling—making them favorites for dinghies, inflatables, small skiffs, and as kicker motors. But how do they compare head-to-head? Here’s a detailed review to help you choose the best engine for your boat.
Quick Picks
- Best for Power & Smoothness: Yamaha F15SMHA – More horsepower, advanced tech, and the legendary Yamaha smoothness.
- Best for Value & Portability: Tohatsu 9.9hp FourStroke – Lightweight, affordable, and extremely reliable for its class.
- Best for Simple Maintenance: Tohatsu 9.9hp – DIY-friendly, with low upkeep costs and great global parts support.
Buyer’s Guide
- Power: Yamaha F15SMHA produces 15hp, making it stronger for heavier loads, planing small boats, or as a kicker for larger hulls. Tohatsu 9.9hp is great for lighter boats, fuel economy, or where HP restrictions apply.
- Weight: Yamaha F15SMHA weighs about 111 lbs (short shaft, manual start). Tohatsu 9.9hp four-stroke (manual, short shaft) weighs about 81–87 lbs—significantly lighter and easier to handle solo.
- Starting & Controls: Both engines use manual start and tiller steering as standard. Yamaha offers legendary smoothness and ease of use. Tohatsu is equally user-friendly and robust.
- Fuel Efficiency: Both are excellent on fuel—EFI on newer models makes starts quick and fuel use low at trolling or cruising speeds.
- Maintenance: Tohatsu is especially easy for DIYers—oil, plugs, impeller, and carb service are all straightforward. Yamaha is also reliable, but some parts can cost more and may need dealer attention for certain repairs.
- Dealer Support: Yamaha boasts the largest network and high resale value. Tohatsu’s support is strong and growing worldwide, with great online parts availability.
- Price: Tohatsu is usually priced lower—especially on the used market—while Yamaha commands a premium for its brand and extra horsepower.
Detailed Product Reviews
1. Yamaha F15SMHA
Who it’s for: Boaters wanting more power in a portable package—great for planing dinghies, heavier inflatables, or as a kicker for sailboats and small cruisers.
- Key Benefits:
- Full 15hp output—stronger acceleration and better top-end speed.
- Ultra-smooth and quiet at all RPMs, with low vibration.
- Reliable EFI starting and great fuel economy.
- Legendary Yamaha build quality and resale value.
- Pros:
- More horsepower for similar size/weight class.
- Excellent dealer network and parts support worldwide.
- Long-term reliability and low emissions.
- Cons:
- Heavier than Tohatsu 9.9hp (by 20–30 lbs).
- Priced higher, both new and used.
Final Verdict: The F15SMHA is a top choice if you need more power, smoothness, and Yamaha’s legendary reputation. See Yamaha F15SMHA listings
2. Tohatsu 9.9hp FourStroke
Who it’s for: Boaters seeking a lightweight, affordable, and reliable engine for small boats, tenders, or as a backup/kicker.
- Key Benefits:
- Lightweight design—easy to transport, mount, and remove by yourself.
- Strong, smooth power for most small boats, with great low-end torque.
- Simple, rugged build—easy to maintain anywhere.
- Very affordable new or used, with great global support.
- Pros:
- Best-in-class portability.
- Simple maintenance and strong online parts availability.
- Lower purchase price and running costs.
- Cons:
- Less power than the Yamaha F15SMHA—may not plane heavier boats as easily.
- Not as many premium features or tech upgrades as Yamaha.
Final Verdict: The Tohatsu 9.9hp is unbeatable for lightness, value, and reliability in its class. See Tohatsu 9.9hp listings
Comparison Table
| Name | Key Features | Specs / Weight | Price Link |
|---|---|---|---|
| Yamaha F15SMHA | 15hp, EFI, smooth & quiet, premium brand | 15hp, 4-stroke, ~111 lbs | See Yamaha F15SMHA listings |
| Tohatsu 9.9hp FourStroke | Lightweight, simple, affordable | 9.9hp, 4-stroke, ~81–87 lbs | See Tohatsu 9.9hp listings |
FAQ Section
- Q: Which is lighter—F15SMHA or Tohatsu 9.9?
A: The Tohatsu 9.9hp is about 20–30 lbs lighter than the Yamaha F15SMHA—ideal for solo mounting or frequent removal. - Q: Which is more powerful?
A: Yamaha F15SMHA offers a full 15hp, while Tohatsu is 9.9hp—Yamaha is better for heavier boats or higher speeds. - Q: Are both easy to maintain?
A: Yes, both are simple four-strokes. Tohatsu has an edge for true DIY ease and lower maintenance costs. - Q: Which is quieter?
A: Both are quiet, but Yamaha is especially smooth and silent at all RPMs, thanks to its advanced engineering. - Q: Which is cheaper?
A: Tohatsu 9.9hp usually costs less new or used, and parts are very affordable.
Conclusion
Both the Yamaha F15SMHA and Tohatsu 9.9hp are great portable outboards with reputations for reliability and easy handling. Choose Yamaha if you need extra power, absolute smoothness, and top brand value. Go with Tohatsu for the lightest weight, best value, and rugged simplicity. Either way, you’ll enjoy dependable, efficient boating for years to come.