F250 SPECIFICATIONS
POWER AND PERFORMANCE
F70
Four Stroke
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 effi ciency. 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.
HOLE SHOT AND ACCELERATION
Yamaha’s F70 provides outstanding hole shot and
acceleration thanks in part to an advanced sensor that
allows maximum safe ignition timing and a gearcase
featuring a high 2.33:1 gear ratio, with specially hardened
pinion, forward, and reverse gears for increased durability.
MORE POWER, CLEANER EMISSIONS
The F70 derives every bit of power available from the fuel
by using Vapor Reduction and Vapor Burning Systems. By
eliminating vapor from the fuel rail and re-routing it back
to the Vapor Separator Tank, only fuel is injected in the
cylinders for better combustion and power. A fuel vapor
valve prevents fuel vapors from escaping to the
atmosphere when the outboard is not running, and
re-routes fuel vapors through the intake when the
outboard is running. This helps achieve maximum fuel
effi ciency and minimum emissions.
MAXIMUM POWER AND EFFICIENCY
Four individual compact electronic fuel injectors
deliver the exact amount of fuel needed for optimum
performance and economy. Controlled by the Engine
Control Module via input from an array of on-engine
sensors, their location just above the intake valves
enhances fuel atomization, resulting in more effi cient
combustion.
Reviewed and/or revised 7/1/10
