Tohatsu vs Mercury Portable Outboards: Small Engine Showdown

In the portable outboard segment (2.5-20 HP), Tohatsu and Mercury dominate the market — and for good reason. What many boaters don't realize is that Mercury's smaller outboards are actually manufactured by Tohatsu and rebadged. But there are important differences worth understanding before you buy.

The Tohatsu-Mercury Connection

Mercury Marine has partnered with Tohatsu since the early 2000s for portable outboards. Mercury's 2.5-20 HP four-stroke motors are built by Tohatsu in Japan and sold under the Mercury brand with Mercury's paint scheme, branding, and dealer network. The engines are mechanically identical, but the ownership experience differs.

What's Different?

• Paint and aesthetics: Mercury uses their signature Phantom Black finish; Tohatsu uses their blue/gray scheme
• Dealer network: Mercury has a larger authorized dealer network in the US
• Warranty terms: Both offer 3-5 year warranties, but coverage details and dealer support differ
• Price: Tohatsu models are typically $200-500 less for the same engine
• Parts availability: Mercury parts are more widely stocked; Tohatsu parts can require ordering

Model-by-Model Comparison

2.5-3.5 HP: The Tender Engines

Perfect for inflatable tenders, small dinghies, and as auxiliary power on sailboats:

• Weight: 37-40 lbs (both brands virtually identical)
• Fuel tank: Built-in, approximately 0.3 gallons
• Starting: Manual pull start
• Best for: Boats under 10 feet, calm water conditions

4-6 HP: The Versatile Mid-Range

The most popular portable outboard segment for small fishing boats and inflatables:

• Weight: 55-62 lbs
• Features: Forward-neutral-reverse gear shift, adjustable tiller
• Fuel: Built-in tank plus external tank option on 6 HP
• Best for: 10-14 foot boats, cartop fishing, small lake cruising

8-9.9 HP: The Sweet Spot

Big enough to plane small boats, light enough to be portable:

• Weight: 82-95 lbs
• Features: Electric start option, power tilt on some models, external fuel tank
• Key note: 9.9 HP is the maximum allowed on many horsepower-restricted lakes
• Best for: 12-16 foot aluminum boats, pontoons on HP-restricted lakes, large inflatables

15-20 HP: Maximum Portable Power

The largest engines that can still be considered "portable" (with some effort):

• Weight: 100-115 lbs
• Features: Electric start standard on most, long and extra-long shaft options
• Performance: Will plane a 14-16 foot boat with moderate loads
• Best for: Jon boats, small center consoles, larger pontoons needing a kicker

So Which Should You Buy?

Choose Mercury if:

• You want the widest dealer and service network
• Easy parts availability is a priority
• You prefer the Mercury brand and aesthetics
• Your local dealer is a Mercury shop

Choose Tohatsu if:

• You want the best value (same engine, lower price)
• You appreciate knowing you're buying from the actual manufacturer
• Your local dealer carries Tohatsu
• Budget is a significant factor

Other Portable Outboard Contenders

• Yamaha: Premium quality, slightly heavier, excellent resale value
• Honda: Quietest operation, best fuel economy, highest price
• Suzuki: Lightest weight in several HP categories, good value

Shop Portable Outboards

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