Nippondenso Trigger Coil System - BOMBARDIER ski-doo Tundra Scandic 2004 Series Shop Manual

Section 06 ELECTRICAL
Subsection 02 (IGNITION TIMING)
To check the ignition timing, refer to illustration and
proceed as follows:
WARNING
Place ski tips against a wall, raise rear of ve-
hicle on a stand, so that track does not contact
the ground. Do not allow anyone in front of
or behind the vehicle while engine is running.
Keep clear of track and do not wear loose
clothing which can get caught in moving parts.
1. Connect the timing light pick-up to a spark plug
cable.
NOTE: To avoid an incorrect reading due to paral-
lax, view the magneto flywheel and the crankcase
timing marks in a straight line.
2. Connect tachometer wire to spark plug wire or
aim tachometer toward spark plug wire without
using any connection wire.
3. Start the engine and raise the engine speed at
least to 3500 RPM (3000 to 4000 RPM) while
observing the timing marks, refer to illustration.
The magneto flywheel mark scribed previously
and the crankcase arrow should be perfectly
aligned. If the marks do not align, a faulty trigger
coil (check proper grounding of coil), a faulty fly-
wheel, a faulty Woodruff key, a misaligned
(twisted) crankshaft or a faulty CDI module
could be the cause: substitute one part at a time
and recheck timing marks (check connectors
condition prior to substituting any part).
NOTE: Ignition timing may be verified when en-
gine speed is anywhere within 3000 - 4000 RPM.
TYPICAL
4. Install parts which were removed.
06-02-8
NIPPONDENSO TRIGGER COIL
SYSTEM
Skandic WT LC/SUV 600
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-
moving and reinstalling the magneto housing, re-
placing the crankshaft, the magneto flywheel, the
trigger coil or the MPEM. If the ignition timing is
found incorrect, first check for proper crankshaft
alignment. This might be the indication of a twist-
ed crankshaft. Refer to LEAK TEST AND ENGINE
DIMENSION MEASUREMENT. The ignition tim-
ing can be checked with either the engine hot or
cold. Also, the ignition timing is to be checked at
3500 RPM with a 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.
Scribing a Timing Mark
1. Clean the area around the MAG spark plug, and
remove it.
2. Install the TDC gauge in the spark plug hole,
(magneto side) and adjust as follows:
a. Position the MAG piston at approximately TDC.
MMR2004-130_06_02A.FM