Ski-Doo Formula 500 1998, Shop Manual

Page: 114 / 398

Section 04 ENGINE
Subsection 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
04-04-7
NOTE: When checking the combustion chamber
volume, engine must be cold, piston must be free
of carbon deposit and cylinder head must be lev-
eled.
1. Remove both spark plugs and bring one piston
to Top Dead Center a using a TDC gauge.
1. Bring piston to TDC
2. Obtain a graduated burette (capacity 0-50 cc)
and fill with an equal part (50/50) of gasoline
and injection oil.
1. Graduated burette (0-50 cc)
3. Open burette valve to fill its tip. Add liquid in
burette until level reaches 0 cc.
4. Inject the burette content through the spark
plug hole until liquid touches the top spark plug
hole.
1. Top of spark plug hole
NOTE: The liquid level in cylinder must not drop
for a few seconds after filling. If so, there is a leak
between piston and cylinder. The recorded vol-
ume would be false.
5. Let burette stand upward for about 10 minutes,
until liquid level is stabilized.
6. Read the burette scale to obtain the quantity of
liquid injected in the combustion chamber.
NOTE: When the combustion chamber is filled to
top of spark plug hole, it includes an amount of
2.25 cc corresponding to the spark plug tip.
7. Repeat the procedure for the other cylinder.
1
F01D2IA
F00B0BA
1
ENGINE TYPE
COMBUSTION CHAMBER
VOLUME (cc)
443 24.1 ± 1.0
494 25.0 ± 1.0
503 27.6 ± 1.0
583 28.7 ± 1.2
670 32.7 ± 0.7
F00D0HA
1