New
Honda15 HP
Honda BF15
2016 · gasoline
$2,200.00
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Used
Yamaha
2008 Yamaha 40HP
$2,800.00
A dependable 40 horsepower four‑stroke Yamaha outboard with EFI and smooth power delivery, known for strong reliability and economical fuel use. Perfect for small recreational boats, tenders, and light commercial use.
Horsepower
40 HP
Fuel Type
gasoline
Year
2008
Hours
222
Displacement
0.75L
Stroke
4-stroke
Rated Output
29.4kW / 40mhp
Rated Speed
6000rpm
In Stock (3 available)
Free shipping on orders over $500
90-day warranty included
Description
The 2008 Yamaha 40HP 4‑Stroke outboard is a compact, smooth‑running, and fuel‑efficient engine ideal for small to medium boats, skiffs, jon boats, and pontoons. Powered by a reliable 3‑cylinder, SOHC four‑stroke design with electronic fuel injection (EFI), it delivers quiet operation, easy starting, and excellent mid‑range torque — perfect for recreational boating, fishing, or utility use. Yamaha’s proven engineering ensures solid fuel economy, reduced emissions, and long‑lasting durability thanks to features like wet‑sump lubrication, efficient EFI management, and quality corrosion resistance.
Specifications
SKUY435689
BrandYamaha
CategoryOutboard Engines
ConditionUsed
Horsepower40 HP
Fuel Typegasoline
Year2008
Displacement0.75L
No. of Cylinders3 cylinders
Stroke4-stroke
Shaft Length20
Weight214.00 lbs
Hours222
Rated Output29.4kW / 40mhp
Rated Speed6000rpm
Cylinder Bore x Stroke65 mm × 75 mm /2.56 in × 2.95 in
Combustion System4-stroke, SOHC, electronic fuel injection (EFI)
AspirationNatural
Alternator16 amps
Dry Weight97 kg / 214lbs
ControlsMechanical
Frequently Asked Questions
What kind of engine is the 2008 Yamaha 40 HP outboard?
The 2008 Yamaha 40 HP is a four-stroke outboard motor that delivers reliable midrange performance for small boats, aluminum fishing boats, inflatables, and pontoons. It is part of Yamaha’s long-standing 40 HP lineup.
How much horsepower does this motor produce?
This model produces 40 horsepower at the propeller, typically optimized around 5000–6000 RPM for best performance.
What is the engine’s displacement and basic specs?
The engine has a 747 cc, three-cylinder design with Electronic Fuel Injection (EFI) for smooth acceleration and efficient fuel use. It also features a 17-amp alternator and a CDI microcomputer ignition system.
What fuel should I use in the 2008 Yamaha 40 HP?
Use unleaded gasoline with a minimum octane rating of 87 and no more than 10 % ethanol to help prevent fuel-related issues.
What shaft length does it come with?
Most 2008 Yamaha 40 HP models were offered with a 20″ (standard) shaft length, suitable for a wide range of transom heights.
Is trimming and tilting supported?
Yes, many units from this period support power trim and tilt, which helps improve boat handling, fuel efficiency, and ease of docking.
What maintenance does the 2008 Yamaha 40 HP need?
Routine maintenance includes: Engine oil and filter changes Lower unit gear oil changes Water pump/impeller inspection Fuel filter replacement Spark plug checks Flushing with fresh water after saltwater use.
How often should I change the oil?
After the initial break-in period (~20 hours), change the engine oil and filter about every 100 hours or once a year — whichever comes first. A Yamalube 4M outboard oil is recommended for best protection in marine environments.
Can I service this motor myself?
Many basic tasks (oil changes, flushing, filter changes) can be done by mechanically inclined owners using the proper tools and manuals, but more complex tasks (valve clearance checks, timing) are best done by a certified Yamaha dealer.
Does it have EFI or carburetor fuel delivery?
Most 2008 Yamaha 40 HP motors use EFI (Electronic Fuel Injection), which helps with smoother starts, better fuel economy, and reduced emissions compared with older carbureted versions.
What boats are best suited for a 2008 Yamaha 40 HP?
This engine is ideal for small-to-mid-size aluminum fishing boats, inflatables, jon boats, and pontoons, providing a good balance of power, efficiency, and lightweight design.
Is this motor suitable for saltwater use?
Yes. Like other Yamaha outboards, it has corrosion-resistant components and materials suitable for saltwater boating. Always flush with fresh water after saltwater use to prolong life.
