Inspection Of Idle Engine Speed; Inspection Of Ignition Timing - TOHATSU MFS 4 Service Manual

14) Inspection of Idle Engine Speed

1. Start engine and run for 5 minutes to warm up.
Attach tachometer to spark plug high tension cord 1 to
2.
check idle 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 1300 r/min

15) Inspection of Ignition Timing

Adjusting system : Automatic control, no adjustment required
Run engine and use timing light to check ignition timing.
8 timings marks are found on the side of flywheel (TDC0°,
ATDC5°, BTDC5°, 10°, 15°, 20°, 25°, 30°), and ignition
timing is read with mark on the center of starter case a
window.
Model
F 4/5/6B
4st 4/5/6 2011
Range of Ignition Angle Engine Starting
TDC 0° — BTDC 25°
1
a
Idling
TDC 0° TDC 0°
a
Accelerating
BTDC 25°
3-17
3