SECTION 2
2-26
3-/ 4-Cylinder
Ignition Timing Adjustment
Models 40D / 50D
1. Pre-set ignition timing link
(1)
and throttle link
(2)
to
specified lengths.
2. Check that the carburetor throttle is fully open when the
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
full throttle matches the following specifications:
NOTE
Align flat surface
(4)
of crankcase mold boss with
calibration of set ring.
4. After adjusting at maximum engine speed, set the advancer
arm
(3)
to minimum engine speed and adjust the ignition to
ATDC 3˚ ± 1˚ using the low speed side stopper
(5)
.
NOTE
Align flat surface
(4)
of crankcase mold boss with calibration
marks on set ring.
Model
Length (approximately)
Ignition Timing Link
Throttle Link
40D 5.04 in [129 mm] 3.86 in [99 mm]
50D 5.04 in [129 mm] 3.86 in [99 mm]
Model Ignition Timing - Full Throttle
40D BTDC 18˚ ± 1˚
50D BTDC 24˚ ± 1˚
Model Ignition Timing - Throttle Closed
40D ATDC 3˚ ± 1˚
50D ATDC 3˚ ± 1˚
2
1
3
2
4
5
6
T1069
T1070
T1071
T1072
T1073
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