Inspection Of Idle Speed; Inspection Of Ignition Timing - TOHATSU MFS25 Service Manual

22) Inspection of Idle 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 850 ± 30 r/min

23) Inspection of Ignition Timing

Adjusting system : Automatic control, requiring no manual
adjustment.
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
25/30B
25/30 2006
Range of Ignition Angle
TDC 0° to BTDC 38°
Engine Starting Idling
BTDC 5° BTDC 5°±5°
1
Accelerating
BTDC 38°
3-27
3