TOHATSU 40 Service Manual page 42

Ignition Timing Adjustment
Models 115 / 120 / 140
1. Adjust ignition timing link (1) and throttle link (2) to
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specification:
Model
Ignition Timing Link
115 5.00 in [127 mm]
120 5.00 in [127 mm]
140 5.00 in [127 mm]
2. Place advancer arm (3) in the minimum speed position
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(throttle fully closed). Set ignition timing to ATDC 10˚ ± 1˚ . If
throttle is not fully closed, make adjustments using throttle link (2).
3. Adjust stopper bolt (5) length so that it contacts the
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advancer arm joint at maximum speed.
4. With the advancer arm at maximum speed (wide
35 36
open throttle), adjust throttle cam stopper (4) on the
air silencer to obtain the specified ignition timing at full throttle:
Model
115
120
140
The rubber damper must be installed on stopper
when making the adjustment.
5. Adjust high speed stopper (5) to specification:
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Model
115
120
140
3-/ 4-Cylinder
GENERAL SERVICE INFORMATION
Length
1
Throttle Link
6.22 in [158 mm]
6.22 in [158 mm]
6.22 in [158 mm]
Ignition Timing - Full Throttle
BTDC 17.5˚ ± 1˚
BTDC 17.5˚ ± 1˚
BTDC 20˚ ± 1˚
NOTE
Length
High Speed Side Stopper
0.71 in [18 mm]
0.71 in [18 mm]
0.55 in [14 mm]
2
5 36
T1081
T1086
T1083
T1084
2-33