Inspection Of Idle Engine Speed; Inspection Of Ignition Timing - TOHATSU MFS 9.9 Owner's Manual

20) Inspection of Idle Engine Speed

1. Start engine and run for 5 minutes to warm up.
Attach tachometer to high tension cord 1 to check idle
2.
speed.
More accurate and stable reading can be
obtained when tachometer lead is connected
with high tension cords of individual cylinders
linked with each other.
Tachometer :
P/N. 3AC-99010-0
Idle Speed :
RPM 950 ± 30r/min

21) Inspection of Ignition Timing

Adjusting system : Automatic control, no adjustment required
Run engine and use timing light to check ignition timing.
11 timings marks are found on the side of flywheel (TDC0°,
ATDC5°, 10°, BTDC5°, 10°, 15°, 20°, 25°, 30°, 35° and 40°),
and ignition timing is read with mark on the center of starter
case window.
Outboard Model
F 9.9/15/20C
4st 9.9/15/20 2008
Range of Ignition Angle Engine Starting
BTDC 5°ー BTDC 35°
1
Idling
BTDC 5° BTDC 5°
Accelerating
BTDC 35°
3-29
3