Take portable power on the water with the Yamaha, a lightweight 4 HP tiller outboard designed for small boats, dinghies, and tenders. Its single-cylinder, 139cc four-stroke engine is suited to short-distance cruising and auxiliary propulsion.
A practical 4 HP outboard for boaters who need compact, portable power and straightforward tiller-handle control.
Yamaha F4 at POP Board Co
The Yamaha 4 HP four-stroke is a compact portable in the lineup: a 139 cc single-cylinder that weighs 60 pounds dry, with a tiller handle, manual start with decompression, and a built-in fuel tank. It is the motor you carry down the dock yourself and mount without a second pair of hands.
Repowering a tender or small inflatable? Start with the fit checks below. Shopping the boat too? Meet the Rover Marine boats we carry.
Consider the F4 for a compatible tender you mount and remove by hand. At 60 pounds with built-in carry handles, it suits boats that live on davits, docks, and beaches.
Four horsepower sips fuel and keeps the setup light. Match the engine to your boat's rating and usual load, and expect easy cruising rather than quick planing.
Compare the motor and the boat together. Your hull, transom, controls, and storage plans all deserve a place in the decision.
Know your Yamaha
The F4 uses a 139 cc, single-cylinder four-stroke engine with a carburetor. Here are the core engine figures from Yamaha's 4 HP specifications.
This listing is the 15-inch short-shaft, manual-start tiller model (F4SMHA). Confirm the exact model and supplied equipment before planning installation.
Thinking beyond the engine?
If the boat is part of the upgrade, POP carries Rover Marine Battle Boats and Battle Cats in 8-, 10-, and 12-foot sizes. The Battle Boat is the traditional single-hull dinghy, laid out for tender runs and easy maneuvering. The Battle Cat is the twin-pontoon catamaran, with a wider stance built for stability.
All six list a 15-inch transom. The 8-foot models seat two people and top out at 6 HP; the 10-foot models seat four and top out at 10 HP; the 12-foot models seat four and top out at 20 HP. The 4 HP sits under every listed ceiling.
Traditional dinghy layout
The smallest Battle Boat pairs the classic tender layout with an 86 lb hull and a 600 lb capacity, built for two people and the tightest launch spots.
The 4 HP sits below this model's listed 6 HP ceiling. Confirm shaft length, motor weight, and mounting before pairing.
Open-bow catamaran layout
The smallest Battle Cat keeps the twin-pontoon stance in an 84 lb package with a 600 lb capacity, for two people who want stability in a compact footprint.
The 4 HP sits below this model's listed 6 HP ceiling. Confirm shaft length, motor weight, and mounting before pairing.
Traditional dinghy layout
The classic tender shape for ship-to-shore runs, harbor cruising, and family days. Two bench seats and a 1,000 lb capacity, with the deck layout to compare against the dinghy you use now.
The 4 HP sits below this model's listed 10 HP ceiling. Confirm shaft length, motor weight, and mounting before pairing.
Open-bow catamaran layout
The twin-pontoon layout and open bow trade a little simplicity for stability: a wider, flatter deck for fishing, swim stops, and moving around with gear aboard.
The 4 HP sits below this model's listed 10 HP ceiling. Confirm shaft length, motor weight, and mounting before pairing.
Traditional dinghy layout
More deck, more capacity, more ceiling. The 12-footer carries 1,200 lb and lists a 20 HP maximum, for crews that want room for gear and longer runs.
The 4 HP sits below this model's listed 20 HP ceiling. Confirm shaft length, motor weight, total load, and mounting before pairing.
Open-bow catamaran layout
The largest Battle Cat pairs the twin-pontoon stance with a 1,200 lb capacity and a 20 HP ceiling, for the most deck space and the most headroom on power.
The 4 HP sits below this model's listed 20 HP ceiling. Confirm shaft length, motor weight, total load, and mounting before pairing.
Boat photos illustrate Rover layouts, not a tested Yamaha F4 package. The linked product pages carry the specifications for each model. Boats and motors are sold separately unless a listing expressly includes both.
Keep the boat you love, or build something new
A horsepower match is only the beginning. Use your exact boat's capacity plate and installation instructions to confirm the complete setup.
Check the horsepower and motor-weight limits for your actual boat and model year. The rating for a 10-foot Rover does not apply to every Rover model.
This listing is the 15-inch short-shaft model. Confirm your boat's transom calls for a 15-inch shaft before ordering, and do not upsize the shaft to chase a feature.
Confirm mounting, steering clearance, propeller, and fuel system. Include passengers, motor, fuel, and gear in the boat's load calculation.
Not sure what to send? Start with your boat's make, model, year, and the specifications on its capacity plate. POP can help identify the questions to resolve before you order.
Family-run. California roots. Since 2012.
POP Board Co started with paddle boards and grew around the days people wanted to spend outside. Today the lineup also includes inflatable docks, chairs, Rover Marine boats, and motors.
Here is what owners say about the Rover boats above.
“Really nice, well made products that we enjoyed all throughout the summer and fall with family and friends.”
“The craftsmanship and design are top-notch, this boat truly stands out from anything else on the water.”
These are boat-owner reviews of Rover Marine boats, not Yamaha motor reviews.
Before the first launch
Use the documentation for your exact engine, and review the order details before installation.
Use the engine's Primary ID from its serial label or warranty card to find the correct Yamaha manual for mounting, break-in, operation, and maintenance.
Motor delivery depends on the order and destination. Review return eligibility before installing or using the engine, and obtain authorization before any return shipment.
Yamaha motor coverage is separate from POP board and dock coverage. Confirm the terms, registration, region, and intended use that apply to your purchase.
Yamaha 4 HP questions
The 8' Battle Boat and 8' Battle Cat both list a 6 HP maximum and a 15-inch transom, which puts the 4 HP below the ceiling. The 10' Battle Boat and 10' Battle Cat both list a 10 HP maximum and a 15-inch transom, which puts the 4 HP below the ceiling. The 12' Battle Boat and 12' Battle Cat list a 20 HP maximum with the same 15-inch transom, so the 4 sits further below. None of these is an automatic fit approval: check your exact boat, motor weight, mounting, and total load.
The 8-footers list up to 6 HP, so the 4 sits within the rating and suits easy displacement speeds, tender runs, and one or two people with light gear. It will not push a loaded 8-footer onto plane the way the 6 HP ceiling match would. If your normal use is a light crew and short hops, the 4 keeps things simple; for quicker planing with a load, more power helps.
Four horsepower will move a 12-footer at easy displacement speeds with a light crew, but it is modest power for a boat rated up to 20 HP. With four adults and gear aboard, do not expect quick planing. If your normal load is one or two people with light gear, the 4 keeps the setup light and simple. For full crews or longer runs, more power gives more margin.
The 10-footers list up to 10 HP, so the 4 is a natural match for tenders, harbor runs, and one or two people with light gear. A full four-person crew with gear will feel leisurely rather than quick. Match the choice to your normal load and talk it through with POP before you commit.
At 60 pounds dry with built-in front and rear carry handles, one adult can carry the F4 short distances, such as down a dock or from a vehicle to the transom. Resting pads allow on-side storage without cowling scuffs.
Yes. The F4 carries a 1.1 L integral tank and also connects to an external tank for longer runs. The external tank is not included.
Speed and planing performance depend on the hull, load, propeller, installation, and conditions. There is no single speed promise for every boat-and-motor combination. Describe your normal crew and use when discussing a setup with POP.
Motor today. More possibilities tomorrow.
Choose the engine for your current hull, or compare a new boat and motor together. POP can help you work through the product questions before you commit.
