BOMBARDIER 1982 Shop Manual page 308

SECTION 04 ELECTRICAL
SUB-SECTION 02 (IGNITION TIMING)
ELECTRONIC IGNITION SYSTEMS
277 ENGINE TYPE
Two methods are detailed in this section, the first using
a Top dead center gauge, the second using a strobosco-
pic timing light.
Top dead center gauge verification
1. Disconnect spark plug wire and remove spark plug.
2. Remove the cylinder cowl and hold the hood in an
open position .
3. 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 parallel
with dial face. Tighten roller lock nut.
(T YPICAL)
Roller
lock nut
Adaptor
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.
PAGE 308
NIPPONDENSO
4. Rotate the crankshaft by the fan counter-clockwise
until the piston is at:
INDIRECT TIMING: 2.85 mm (0.112") B.T .D.C.
BTDC : Before top dead center.
At this point, the crankcase mark and the fan outer cir-
cumference mark MUST align .
If the marks do not align, reinstall the cylinder cowl and
verify if the fan yellow pawl mark aligns with the fan cowl
mark.
A) If the yellow pawl mark aligns with the fan cowl mark,
remove the cowl and make a new fan outer circum-
ference mark in line with the crankcase mark .
B) If the yellow pawl mark does not align with the fan
cowl mark, make a new fan cowl mark in line with
the yellow pawl mark .
Fan cowl
Fan cowl
mark
_ CAUTION: Timing marks verification cannot be
.". used as a timing procedure, therefore, always check
the timing (using a stroboscopic timing light) at 6000
R.P.M. after the marks have been align.
Reinstall the cylinder cowl and the spark plug.