TOHATSU BFT 250A, Service Manual

Page: 81 / 639

3-23
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MAINTENANCE
USING A COMMERCIALLY AVAILABLE DIGITAL
MULTIMETER
Install a commercially available digital multimeter with
an inductive pickup (Fluke 88) [1].
Connect the inductive pickup to the No.1 ignition coil
primary wire [2] with the "SPARK PLUG" side toward
the spark plug as shown.
Start the engine.
Wait until the engine speed stabilizes under no load,
and check the idle speed.
• If the idle speed is outside the specification, adjust it
(page 3-23).
ADJUSTMENT
Remove the propeller and set the outboard motor gear
case in a test tank filled with water. Start the engine.
Disconnect the 2P connector [1] from the IAC valve [2].
The MIL [3] should come ON and the warning buzzer
should sound (intermittent sound: long beep).
SPECIFIED IDLE SPEED (AT NEUTRAL):
650 ± 50 min -1 (rpm)
[2]
[1]
[1]
[2]
[3]