TOHATSU BFT250A Service Manual page 622

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TECHNICAL FEATURES
SHIFT EFFORT REDUCTION SYSTEM
TECHNICAL FEATURES
GENERAL
The effort when shifting the control lever (throttle valve) from the half-open position to the neutral is reduced by retarding the ignition
timing by the ECM.
ENGINE SPEED
THROTTLE POSITION
IGNITION TIMING
NEUTRAL SW
CONSTRUCTION AND FEATURES
Using engine speed and throttle opening signals from each sensor, the ECM computes and retards the ignition timing of No.4, 5,
and 6 spark plugs to temporarily alter the crankshaft speed.
No.1
No.2
No.3
21-2
Executes shift effort
reduction control
Fully
closed
ON
FWD/RVS
OFF
When the clutch shifter is disengaged and set at the neutral position, the
ECM finishes computation to retard the ignition timing to reduce shift effort.
N
CRANKSHAFT
To VERTICAL SHAFT
The ECM starts computation to retard the ignition timing to reduce
shift effort when the engine speed is above the prescribed level,
the throttle is fully closed, and the gear is engaged.
ECM
NEUTRAL
No.4
No.5
No.6