Finding the smallest jet outboard motor isn't always as straightforward as walking into a shop and grabbing a 2-hp kicker. Most of the time, when we talk about jet drives, we're looking at engines that start a bit beefier than your standard prop-driven portable. However, if you're tired of grinding your propeller into aluminum-colored dust every time you hit a shallow riverbed, going small with a jet is the only way to go.
The search for the "smallest" option usually leads you down two different paths: buying a factory-made jet outboard or taking a small gas engine and slapping a conversion kit on it. Let's break down what's actually out there and why you might want one of these little screamers on your transom.
Why go small with a jet drive?
Most people want a jet because they have a specific problem: rocks. If you're fishing for trout in a skinny river or navigating tidal flats where the water depth changes faster than the weather, a propeller is basically a liability. The smallest jet outboard motor gives you the freedom to run in just a few inches of water without that constant "cringe" feeling you get when you hear metal hitting stone.
But there's a trade-off. Jets are inherently less efficient than props. You lose about 30% of your power right off the bat because of how the water is pushed through the impeller. This is why you don't see many 2-hp jet motors out there; by the time you account for that power loss, you'd barely have enough thrust to fight a light breeze.
The current "smallest" factory options
If you want something brand new from a big manufacturer, your options for a smallest jet outboard motor usually hover around the 25-horsepower mark.
Mercury, for example, has a 25hp Jet. It's a popular choice because it's built on a 40hp powerhead. That's the "secret" of the jet world—to get 25hp of actual thrust at the pump, the engine itself usually needs the guts of a much larger motor. It's lightweight enough for a decent-sized jon boat or a heavy-duty inflatable, but it's not exactly something you're going to carry in one hand from your truck to the water.
Yamaha also plays in this space with their F40 Jet. Again, it's "small" in the grand scheme of jet boats, but it's a serious piece of machinery. If you're looking for something smaller than these, you're usually looking at the used market or the world of custom modifications.
The world of conversion kits
This is where things get interesting. If a 25hp motor is too big for your needs, you can actually create your own smallest jet outboard motor by using a conversion kit. Companies like Outboard Jets make pump units for smaller engines, sometimes down to the 15hp or 20hp range.
I've seen guys take a 20hp Tohatsu or Suzuki and swap the lower unit for a jet pump. Suddenly, you have a motor that's pushing about 13-15hp at the jet, which is plenty for a 12-foot tin boat. It's a bit of a DIY project, but it's the best way to get a truly compact setup that can handle the shallows.
Why doesn't everyone do this?
Well, money is a big factor. Buying a small outboard and then spending another thousand dollars (or more) on a jet pump isn't cheap. Plus, you've got to be comfortable with a wrench. But for the person who needs to get into places where no one else can go, that investment is worth every penny of prevented prop damage.
Electric jets: The new contenders
If we're being literal about the smallest jet outboard motor, we have to talk about electrics. While they aren't "outboards" in the traditional internal combustion sense, brands like Bixpy and Torqeedo offer tiny jet-style propulsion units.
These are incredibly small—sometimes small enough to fit into the palm of your hand. They're designed for kayaks and small canoes. They don't use a massive impeller housing; instead, they use high-speed encased fans. While they won't get a 14-foot boat on plane, they are technically the smallest jet drives on the market today. If your goal is just to move a tiny craft through a weed-choked pond without tangling a prop, these are worth a look.
Performance and expectations
Before you go out and buy the smallest jet outboard motor you can find, you need to manage your expectations. A jet isn't a "set it and forget it" tool.
First, they are loud. Because the engine has to run at higher RPMs to generate the necessary thrust through the pump, you're going to hear it. Second, they don't steer like a prop boat. At low speeds, you have very little control because you don't have a rudder-like skeg or a spinning prop to move water over. You're essentially steering a fire hose.
Sucking up debris
The biggest headache with small jet motors is the intake grate. Since the motor is literally vacuuming water off the surface, it's also going to vacuum up everything else. Leaves, grass, and small pebbles are the enemy. If you're running in a "leafy" river in the fall, you might find yourself reaching over the back of the boat to clear the grate every twenty minutes.
Weight vs. Power
One thing that surprises people looking for the smallest jet outboard motor is the weight. Because a jet pump assembly is often heavier and more complex than a standard lower unit, these motors can feel a bit back-heavy.
If you put a 25hp jet on a tiny 10-foot jon boat, you might find the stern sitting dangerously low in the water. It's a balancing act. You want the smallest motor possible, but it still needs enough "oomph" to get the boat up on plane. A jet boat that isn't on plane is basically useless in the shallows; you need that lift to keep your hull from dragging on the bottom.
Is it worth the investment?
Let's be real: jet motors are niche. They're more expensive to buy, more expensive to maintain, and they burn more fuel. But if you live in a place like the Pacific Northwest, the Ozarks, or the shallow coast of Florida, they aren't a luxury—they're a necessity.
The smallest jet outboard motor allows you to see parts of the wilderness that prop-driven boats simply can't reach. There's a certain magic to skimming over three inches of water in a boat that only weighs a few hundred pounds. It feels like flying.
Maintenance tips for small jets
If you pull the trigger on one, keep these things in mind: 1. Keep the impeller sharp. A dull impeller is like a dull knife; it doesn't work well and makes everything harder. 2. Watch the shim gap. The distance between the impeller and the liner is crucial. If it gets too wide, you lose all your power. 3. Grease it often. Most jet pumps have a grease fitting that needs attention after every few hours of use. Don't skip this, or you'll be buying a very expensive new bearing assembly.
Final thoughts on going small
At the end of the day, the smallest jet outboard motor for you depends on how much boat you're trying to move. If you can live with a 25hp factory model, that's your easiest route. It's reliable, has a warranty, and is ready to go.
However, if you're a tinkerer and want the absolute smallest footprint, look into converting a 15hp portable. It's a lot of work, but having a lightweight, rock-jumping machine is a feeling that's hard to beat. Just remember to bring a paddle—because even the best jet motor can't help you if you suck up a plastic bag in the middle of a rapid!