When it comes to small portable outboards, the Mercury 9.9 and Tohatsu 9.8 are two of the top choices for dinghies, inflatables, jon boats, and small fishing skiffs. Both engines are legendary for reliability, easy starting, and simple maintenance. But which one is right for your boat? Here’s a full comparison of Mercury 9.9 vs Tohatsu 9.8 to help you pick the best lightweight outboard for your adventures.
Quick Picks
- Best Overall: Tohatsu MFS9.8 – Ultra-lightweight, proven reliability, and excellent value.
- Best for Tech & Dealer Network: Mercury 9.9 FourStroke – Solid performance with excellent global dealer support and modern styling.
- Best Budget Pick: Tohatsu MFS9.8 – Most affordable in class with very low maintenance costs.
Buyer’s Guide
Before deciding, keep these key factors in mind:
- Weight: Tohatsu 9.8 is one of the lightest four-strokes in the 8–10hp class (just over 80 lbs), making it very easy to carry and mount. Mercury’s 9.9 is a bit heavier, but still manageable.
- Starting: Both offer reliable manual start (and some models with electric start). Both are easy to start, even for beginners.
- Fuel System: Both are carbureted for simple, proven operation. Mercury has a slightly larger displacement, while Tohatsu wins on lightness.
- Controls & Features: Mercury models may have extra options for tiller extension, alternator output, and tech add-ons. Tohatsu keeps it basic, simple, and easy to maintain.
- Price & Warranty: Tohatsu is usually less expensive for new models, while Mercury wins on brand recognition and broad warranty support.
- Dealer Support: Mercury has the bigger dealer network in North America. Tohatsu is widely supported and easy to service, but check local options.
Detailed Product Reviews
1. Tohatsu MFS9.8
Who it’s for: Boaters needing the lightest, simplest portable outboard for dinghies, inflatables, or car-topping small boats.
- Key Benefits:
- Weighs just over 80 lbs—easy to carry, mount, and remove.
- Very low maintenance, carbureted design is easy to work on at home.
- Strong reputation for reliability and long life.
- Pros:
- Affordable new or used.
- Available in short and long shaft, and with external tank.
- Great fuel economy for a carbureted model.
- Cons:
- No EFI (all carbureted).
- Fewer tech features or add-ons.
Final Verdict: The MFS9.8 is a lightweight champion—perfect for small boats where every pound counts. See MFS9.8 pricing
2. Mercury 9.9 FourStroke
Who it’s for: Boaters wanting a bit more displacement, modern looks, and the widest dealer support for travel or remote use.
- Key Benefits:
- Strong, smooth performance with slightly more torque at higher RPMs.
- Great support—parts and service are easy to find almost anywhere.
- Available with electric start, remote controls, and additional options.
- Pros:
- Excellent brand reputation and resale value.
- Multiple models for every need—ProKicker, Command Thrust, etc.
- Easy to upgrade with accessories and tech features.
- Cons:
- Heavier than Tohatsu MFS9.8.
- Priced higher new, especially with extra features.
Final Verdict: The Mercury 9.9 is a great pick for boaters wanting more options, tech, and top-level support. Check Mercury 9.9 pricing
Comparison Table
| Name | Key Features | Specs / Weight | Price Link |
|---|---|---|---|
| Tohatsu MFS9.8 | Ultra-light, simple, affordable | 9.8hp, carbureted, ~81 lbs | See MFS9.8 pricing |
| Mercury 9.9 FourStroke | More options, big dealer network | 9.9hp, carbureted, ~84–95 lbs (varies by model) | Check Mercury 9.9 pricing |
FAQ Section
- Q: Are Mercury 9.9 and Tohatsu 9.8 the same engine?
A: In some lower horsepower models, Mercury 9.9 outboards are built by Tohatsu, but Mercury sets different specs, cowling, and sometimes gear ratio. Always check your serial/model year for details. - Q: Which is lighter?
A: Tohatsu MFS9.8 is one of the lightest 4-strokes in its class—ideal for portable or car-top use. - Q: Which starts easier?
A: Both are known for easy manual starting. Electric start is available on some Mercury models. - Q: Which holds value better?
A: Mercury has slightly higher resale value in North America due to brand recognition, but both engines are in demand on the used market. - Q: Which is more affordable?
A: Tohatsu MFS9.8 is usually less expensive new and offers strong value for years of use.
Conclusion
Both the Mercury 9.9 and Tohatsu 9.8 are excellent portable outboards, known for their reliability and easy handling. Choose the Tohatsu MFS9.8 for the lightest weight and lowest price, especially for small boats where every pound matters. Pick Mercury if you want the widest dealer support, more options, and slightly higher resale. Either way, you’ll get a dependable engine that’s easy to use, service, and enjoy for years to come.