TOHATSU 40 Service Manual page 37

SECTION 2
Ignition Timing Adjustment
Models 60B / 70B
1. Pre-set ignition timing link (1), throttle link (2), and high
12
speed side stopper (3) to specified length.
Ignition Timing
Model
1
Link
60B 5.24 in [133 mm]
70B 5.24 in [133 mm]
2. Place advancer arm (4) in the maximum speed position
13
(wide open throttle) and make sure the carburetor throttle is
fully open. If throttle is not fully open, make fine adjustments using
throttle link (2).
3. With the advancer arm still in the maximum speed
14
position (wide open throttle), set the ignition timing to
specification by adjusting ignition timing link (1).
Model
60B
70B
Align flat surface (6) of crankcase mold boss with
15
calibration marks on set ring.
4. Place advancer arm (4) in the minimum speed position
16 16
(throttle fully closed). Adjust throttle link (2) so ignition timing
is ATDC 3˚ ± 1˚ when the advancer arm is in contact with low speed
side stopper (7).
Model
60B
70B
2-28
Length (approximately)
Throttle
2
Link
5.00 in [127 mm]
5.00 in [127 mm]
Ignition Timing - Full Throttle
BTDC 16˚ ± 1˚
BTDC 20˚ ± 1˚
NOTE
Ignition Timing - Throttle Closed
ATDC 3˚ ± 1˚
ATDC 3˚ ± 1˚
High Speed
3
Stopper
0.28in [7 mm]
0.28 in [7 mm]
T1074
T1075
T1076
T1077
T1078
3-/ 4-Cylinder