Yamaha 100 HP Four-Stroke Outboard Motor - 20" Shaft
The Yamaha 100 HP outboard is a four-stroke marine engine featuring a four-cylinder inline configuration with Electronic Fuel Injection (EFI). This model utilizes a 1832cc displacement and is equipped with the Yamaha Digital Electronic Control system to manage engine synchronization and RPM adjustments. The unit weighs approximately 357 lbs (162 kg) and features a 2.15:1 gear ratio for efficient power transfer. Designed for versatility, it includes integrated throttle and shift controls alongside a comprehensive monitoring system for engine vitals. This outboard is engineered for motor boats with hull lengths between 5 and 6.5 meters, including day cruisers, bowriders, and small cabin cruisers. It is compatible with standard BIA bolt patterns and 12V marine electrical systems.
Used. Sold as a used unit. The original factory warranty has expired or is non-transferable — any remaining coverage is only as stated in writing on your invoice.
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- No factory warrantySee condition & warranty above
- Crated FreightDamage claim assistance
- Free LTL ShippingContiguous U.S.
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Enter your transom measurement and the USCG max-HP plate rating from your hull.
Every spec, no calls required
- Horsepower
- 100 HP
- Stroke
- 4-Stroke
- Displacement
- 1832 cc
- Cylinders
- 4
- Operating RPM Range
- 5000-6000
- Gear Ratio
- 2.15:1
What's in the Crate
Each engine ships on a reinforced LTL pallet. Crated weight approx. 452 lb.
- Powerhead with factory-sealed cowling and cylinder cover
- Mounting hardware kit — BIA standard
- Integrated power trim/tilt assembly (pre-charged)
- Owner's manual, warranty registration card, and rigging diagrams
- Anode set installed (saltwater-grade zinc/aluminum)
- Propeller (sold separately — see compatible diameters in specs)
- Throttle/shift controls, harness, and key switch
- Rigging gauges (tach, fuel, trim) and digital display
- Battery, battery cables, and isolator
- Steering helm, hoses, and hydraulic fluid
Freight & Transit Estimator
LTL liftgate delivery to the lower 48. Carrier calls to schedule a 4-hour window.
- Crated weight
- 452 lb
- Crate dims
- 60" × 32" × 42"
- Carrier class
- LTL Class 85
- Signature
- Required at delivery
Compatibility & Rigging FAQ
Mechanical and electrical facts for your rigger. Specifications follow ABYC and OEM service standards.
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