![]() It then enters each cylinder through individual long intake tracks, which are 'pulse tuned' to provide air at the precise volume and timing for maximum density and power. ![]() ![]() Precise Throttle Control: All air entering the engine block of Yamaha's new F70 four stroke is routed through a single throttle valve, to ensure the precise amount of air necessary for optimum power and fuel efficiency. ![]() Yamaha's new F70 is not only the lightest four stroke 70 horsepower outboard, it's even lighter than competitive two stroke direct-injected outboards.
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