Lower unit
2-28
Propeller (XTO-EC series)
New XTO-EC series is available in addition to the existing XTO-OS series compatible with large horse-
power models.
XTO-EC series are high performance 3-blade stainless steel propellers having excellent anti-ventila-
tion performance compared to the OS series. This allows more comfortable boat operation in the
rough sea and on the heavily loaded boat.
Engine ECM
PTT protection control
PTT protection control system prevents damage to PTT unit, bracket and other related components
when the engine speed becomes excessively high while the outboard motor is raised higher than its
trim range. The engine speed is limited to the given rpm or below by the system if the PTT sensor out-
put voltage exceeds the specification value.
Model
PTT sensor output
voltage (or higher)
RPM limitation
F450AVT, XF450SA 6KN
2.095 V 1551 r/min
FL450AVT 6KP
F400AST, XF400SA 6LB
FL400AST 6LC
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