BOMBARDIER SEA-DOO GS 5626 1998, Shop Manual

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Section 08 ELECTRICAL SYSTEM
Subsection 02 (IGNITION SYSTEM)
08-02-5
1. Multi-Purpose Electronic Module
Ignition Coil
The ignition coil steps up the voltage input from
the Multi-Purpose Electronic Module to high volt-
age current for both spark plugs.
IGNITION TIMING
Before checking ignition timing with a strobo-
scopic timing light (dynamic test), it is mandatory
to scribe a timing mark on the PTO flywheel (stat-
ic test) corresponding to the specific engine.
Also, the timing mark scribed on the PTO flywheel
can be used to troubleshoot a broken magneto
woodruff key.
NOTE: Do not use the factory mark found on the
PTO flywheel to check ignition timing or trouble-
shoot any problems.
787 and 947 Engines
Normally ignition timing adjustment should not be
required. It has been set at factory and it should
remain correctly adjusted since every part is fixed
and not adjustable. The only time the ignition tim-
ing might have to be changed would be when re-
placing the crankshaft, the magneto rotor, the
trigger coil and the MPEM. If the ignition timing is
found incorrect, you should first check for proper
crankshaft alignment. This might be the indication
of a twisted crankshaft.
With this DC-CDI system, the ignition timing can
be checked with either the engine hot or cold. Al-
so, the ignition timing is to be checked at 3500
RPM with the timing light.
NOTE: Between 3000 and 4000 RPM, the spark
advance does not change. So when checking igni-
tion timing at 3500 RPM, a change in engine
speed within
±
500 RPM will not affect the timing
mark when checked with the timing light.
Static Test
All Engines
1. Disconnect MAG side spark plug wire and con-
nect wire to grounding device then remove
spark plug.
2. Remove PTO flywheel guard.
717 Engine
3. Install timing mark pointer tool on engine using
wing nuts previously removed.
1. Timing mark pointer tool (P/N 295 000 130)
-
CAUTION
The relation between the PTO flywheel mark
position and crankshaft position may change
as the PTO flywheel might tighten/loosen on
the crankshaft. As an example, when the en-
gine is accelerated out of water, PTO fly-
wheel may tighten then loosen when the
engine is decelerated. This will result in a
false ignition timing reading. Always verify
PTO flywheel mark position before checking
ignition timing with an appropriate timing
light. If mark does not align with tool, repeat
static test to ensure flywheel has not loosen
before changing the ignition timing.
F06H0SA
1
F01H5SA
1