BOMBARDIER 1980 Shop Manual page 156

SECTION 03
SUB-SECTION 03, (IGNITION TIMING)
C.D. IGNITION - 354-454 ENGINE TYPES
FOREWORD
On models equipped with a C.D. Ignition system. plug
firing IS initiated by an electrical pulse. This pulse is
released when a metal projection on the flywheel hub
rotates near the trigger coil. Therefore, timing must be
performed while the engine is running.
A stroboscopic timing light such as Sun PTL 45. Snap-On
MT215B. Bosch EFAW 169A. or a suitable equivalent.
plus a 12 volt battery are needed.
IGNITION TIMING
Timing procedure for this engine type IS composed of
four main phases, all being equally important:
1. Position of the armature plate.
2. Position of the timing marks on magneto ring.
3. Air gap between trigger coil and magneto ring.
4. Timing verification using a stroboscopic timing light.
1.
To obtain best generator coil performance, position
the armature plate on the crankcase with the retaining
cap screws in the middle of the plate slots.
. . , CAUTION: When assembling magneto ring on
" crankshaft, clean crankshaft extension (cone) and
threads. Apply "Loctite 242" (no. 4137025) on cone
and threads. Torqu.e bolt to 80 N'm (60ft-lbs).
(IGNITION TIMING). PAGE 8
2. Check the position of the timing marks (for each
cylinder) on magneto ring: repunch if necessary.
With the piston positioned at 1.40 mm (.055")
B.T.D.C .. magneto ring mark should align with central
mark on crankcase (around timing hole).
II
Crankcase
central mark