TOHATSU 40 Service Manual page 35

SECTION 2
Ignition Timing Adjustment
Models 40D / 50D
1. Pre-set ignition timing link (1) and throttle link (2) to
2
specified lengths.
Model
Ignition Timing Link
40D 5.04 in [129 mm]
50D 5.04 in [129 mm]
2. Check that the carburetor throttle is fully open when the
3
advancer arm (3) is in the fully advanced position. If throttle
is not fully open, make fine adjustments using throttle link (2).
3. Adjust ignition timing link (1) so that the ignition timing at
2
full throttle matches the following specifications:
Model
40D
50D
Align flat surface (4) of crankcase mold boss with
4
calibration of set ring.
4. After adjusting at maximum engine speed, set the advancer
5
arm (3) to minimum engine speed and adjust the ignition to
ATDC 3˚ ± 1˚ using the low speed side stopper (5).
Model
40D
50D
Align flat surface (4) of crankcase mold boss with calibration
6
marks on set ring.
2-26
Length (approximately)
1
Throttle Link
3.86 in [99 mm]
3.86 in [99 mm]
Ignition Timing - Full Throttle
BTDC 18˚ ± 1˚
BTDC 24˚ ± 1˚
NOTE
Ignition Timing - Throttle Closed
ATDC 3˚ ± 1˚
ATDC 3˚ ± 1˚
NOTE
2
T1069
T1070
T1071
T1072
T1073
3-/ 4-Cylinder