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Performance:
The engine should run smoothly and deliver consistent power, with excellent compression in all cylinders (typically 140-150 PSI).
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Maintenance & Service History:
A documented service history and a fully serviced engine are crucial. Some sellers may offer a warranty.
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Low Hours:
A lower number of operating hours generally indicates less wear and a longer remaining life for the engine.
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Cosmetic Condition:
Look for original paint and decals that are free of fading and appear in excellent condition.
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Components:
Check that essential components are included, such as digital gauges, engine harness, battery cables, and a propeller.
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Cleanliness:
A clean motor, both inside and out, suggests proper care and maintenance.
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Special Features:
Depending on the model, it might have features like fuel injection (EFI), Wide Range Power Trim and Tilt, a Digital Network System, or compatibility with a security system like Y-COP®.
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Engine Model:
There are different 115 HP models, such as the popular F115, which are known for their reliability and fuel efficiency.
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Shaft Length:
The F115 is available in different shaft lengths (e.g., 20” or 25”) to fit various boat transom heights.
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Freshwater vs. Saltwater Use:A motor that has only been used in freshwater will generally have less corrosion and wear compared to one used in saltwater.
- Engine Type: 4-stroke, In-line 4-cylinder, DOHC (Double Overhead Camshaft) with 16 valves.
- Displacement: 1,832 cc (1.8-liter).
- Maximum Output: 84.6 kW (115 ps) @ 5800 r/min.
- Fuel System: Electronic Fuel Injection (EFI).
- Weight: L-shaft models are approximately 377 lbs (173 kg), with X-shafts slightly heavier.
- Power-to-Weight Ratio: The F115 is known for being the lightest in its class.
- Alternator: High output 35-amp (or 45A on some models) alternator to support accessories and maintain power at low RPMs.
- Trolling Control: Standard Variable Trolling RPM control (600-1000 r/min in 50 r/min steps) via the tachometer or tiller handle.
- Digital Network Compatibility: Can be integrated with the Yamaha Digital Network System for advanced monitoring and control.
- Engine Management: Includes a knock sensor for constant peak output and twin balance shafts to minimize vibration.
- Exhaust System: A labyrinth exhaust system reduces engine noise at lower speeds.
- Other Features: Freshwater flushing device, remote control, and support for a wide range of props.
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