BOMBARDIER 1982 Shop Manual page 304

,.
SECTION 04 ELECTRICAL
SUB-SECTION 02 (IGNITION TIMING)
5. Install and adjust T.D.C . gauge on engine as follows:
• Rotate magneto clockwise until piston is just before
top dead center.
• With gauge in adaptor, adjust roller so that it is paral-
lel with dial face. Tighten roller lock nut.
Adaptor
~----
lock nut
Roller
lock nut
• Loosen adaptor lock nut then holding gauge with dial
face toward magneto, screw adaptor in spark plug
hole.
• Slide gauge far enough into adaptor to obtain a
reading then finger tighten adaptor lock nut.
• Rotate magneto until piston is at Top Dead Center.
• Unlock outer ring of dial and turn it until
"0"
on dial
aligns with pointer.
• Lock outer ring in position .
6. Slacken the three (3) armature plate retaining screws
and turn timing instrument ON.
7. Rotate magneto counter-clockwise until piston is at:
DIRECT TIMING: 3.98
±.
0.25 mm BTDC
(0.157
±
.010")
BTDC: Berore top dead center.
Slowly rotate armature plate until timing light fluctu-
ates. Retighten retaining screws.
O
NOTE: For 247 engine type, hold advance mecha-
nism centrifugal lever in full advance position (to-
ward magneto rim).
PAGE304
position
advance
position
O NOTE: Ignition timing can change upon tightening
Always recheck after tightening.
Edge gap verification
By following either of the two procedures herein men -
tioned the edge gap will automatically be adjusted.
However, if the edge gap is to be verified, proceed as
follows:
From timing marks, rotate magneto clockwise
1/ 4
of a
turn, (for 247 engine type hold advance mechanism cen-
trifugal weight in full advance position (toward magneto
rim)), then slowly turn magneto back counter-clockwise
until timing light fluctuates.
At this point check the distance between generator coil
end and magnet (edge gap), with a cardboard strip of
appropriate width.
ENGINE TYPE
EDGE GAP
247 5 - 8 mm
(0.195 - 0.315")
Edge gap
~
,\
Carboard strip
Magnet - ___ ,,;,
If edge gap is more or less than specified, the problem
lies with engine internal components (crankshaft out of
alignment, broken Woodruff key, loose breaker cam,
etc.); corrective measures should be applied.