Effectivity 912/914 Series
Edition 1 / Rev. 0
74-00-00
page 19
May 01/2007
d02624
BRP-Rotax
Maintenance Manual
3.10) Ignition timing control
See Figs. 74-16 and 74-17.
The automatic ignition timing is actuated by the trigger cam (1) of ignition circuit
A
or trigger cam (2) of ignition circuit
B
. Transition from start ignition timing to
operating ignition timing takes place from 650 rpm upwards.
Inspection is carried out with a stroboscope and induction pliers.
For this procedure, connect stroboscope to battery and clamp inductive pliers
to the ignition cable of cylinder
"1 top"
. This spark plug is actuated by the trigger
coil
A1/2
.
At an engine speed of 150 to max. 1000 rpm,. the trailing edge
of the trigger cam
(3) aligns with the core (4) of the trigger coil.
Trigger coil assignation (on the 912 Series)
Trigger coil A1/2 serves the top spark plug of cylinder 1 and 2
Trigger coil A3/4 serves the bottom spark plug of cylinder 3 and 4.
Trigger coil B1/2 serves the bottom spark plug of cylinder 1 and 2
Trigger coil B3/4 serves the top spark plug of cylinder 3 and 4.
Trigger coil assignation (on the 914 Series)
Trigger coil A1/2 serves the top spark plug of cylinder 1 and 2
Trigger coil A3/4 serves the top spark plug of cylinder 3 and 4
Trigger coil B1/2 serves the bottom spark plug of cylinder 1 and 2
Trigger coil B3/4 serves the bottom spark plug of cylinder 3 and 4.
After transition from start ignition timing to operating ignition timing, the leading
edge of the trigger cam (5) aligns with the core (4) of the trigger coil.
See Fig. 74-17.
For wear limits, see 74-00-00 sec. 4.
The readings must be entered in 72-00-00 sec. 5.
The ignition timing control must be carried out on all 4 trigger coils, paying
attention to the corresponding ignition cable.
See 72-00-00 sec. 5.
Summary of Contents for MMH-912 Series
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