Yamaha Outboards 225HP, 250HP
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Variable Cramshaft Timing on the new F250. The ECM (Engine Control Module) varies camshaft timing based on engine rpms, maximizing intake and exhaust efficiency. The result? Optimal combustion, great volumetric efficiency - and a full 16% gain in torque in the 2000-3500 rpm range, where you really need it.

Electronically-Controlled Single Throttle Valve precisely controls the air flow through the surge tanks in to the long tube intake tracks. The air silencer box reduces intake air noise for whisper quiet operation. The long tube intake tracks are tuned to increase air flow which boosts low end and midrange torque and performance (F250 only).

Electronic Multi-Port Fuel Injection - 6 individual fuel injectors provide the precise amount of fuel for each individual cylinder. Optimal fuel atomization provides better combustion, further enhancing performance and fuel efficiency.

Exhaust Pressure Reduction System reduces exhaust pressures while cooling the hub on the propeller. This process increases hp output while simultaneously increasing propeller durability. Another Yamaha innovative performance and reliability feature (F250 only).

Large Diameter Intake and Exhaust Valves - The intake tracks are engineered to deliver the air and fuel more directly into the combustion chamber. This design allows additional space for the intake and exhaust valves to have an increased diameter which greatly increases volumetric efficiency. The intake valves also have larger valve lift for increase top end performance.

Long Tube Intake Tracks are precision-tuned to maximize air velocity, delivering added low-end and midrange torque (F225).

Inside Track Fuel Injection positions individual fuel injectors on the inward side of each intake track, saving space and keeping electrical wiring away from the cowling latches (F225).

In-Bank Exhaust - another Yamaha first. We reversed the conventional four stroke configuration, allowing space for the exhaust to exit between the V-block downward for a more compact design.

SPECIFICATIONS

STANDARD & OPTIONS

	F250hp V6 Four Stroke	F225hp V6 Four Stroke
Engine Sensing Warning System	S	S
Engine Stop Switch Lanyard	O	O
Fuel Management Gauge	O	O
Multi-Function Speedometer	O	O
Multi-function Speedometer/Fuel Management Gauge	O	O
Multi-Function Tachometer	O	O
2 Year Limited Warranty*	S	S
Ultimate Corrosion Protection System	S	S
Electronic Fuel Injection	S	S
External Tilt Switch	S	S
High Output Alternator	S	S
Micro-Computer Ignition System	S	S
Multi-Charge Monitoring System	S	S
Prime Start	S	S
Power Trim and Tilt	S	S
Sure-Seal Tri Latch	S	S
Thermostatic Cooling System	S	S
Counter Rotation
Saltwater Series Prop	O	O
Saltwater SeriesII Prop	O	O
Painted Stainless Steel Series Prop	O	O
Reliance Series Prop	O	O
Performance Series 3 S/S Prop	O	O
Performance Series 4 S/S Prop	O	O
Pro Series Prop		O
Remote Steering	S	S
Freshwater Flush	S	S
Command Link® Gauges	O	O
Command Link® Controls	R	R

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