Arctic Cat 2014 SNO PRO 500 Operator's Manual page 45

Reed Valve Assembly
1. Disassemble and wash the reed valves, stopper, and
cage assembly in warm, soapy water and blow dry.
2. Inspect the reed valves, stoppers, and valve cage
for cracks, chips, or any deterioration.
NOTE: For assembling purposes, note the posi-
tion of the beveled corner of the reed stopper (A)
and the flat corner of the reed valve (B).
3. With the reed valve and stopper properly posi-
tioned on the cage, secure with the screws tight-
ened to 48 in.-lb.
4. Inspect the reed stopper height. Using a caliper, mea-
sure the distance from the seat to the bottom outer tip
edge of the stopper. Measurement must not exceed
specifications. If measurement is not within specifica-
tions, either bend or replace the reed stopper.
Measuring Critical Components
NOTE: Critical engine specifications charts can
be found in Section 1 of this manual.
Cylinder Head Volume
(Squish-Gap Method)
To check the squish gap, a micrometer and two heavy
pieces of solder will be needed.
1. Remove the spark plugs from the engine.
2. Simultaneously insert two pieces of solder down
through the spark plug hole and push them up
against the inner cylinder bore towards the MAG-
side and PTO-side of the cylinder.
3. Pull the recoil rope and crank the engine over sev-
CM162
eral times while the solder is being held firmly in
place.
4. Remove both pieces of solder from the cylinder.
Using the micrometer, measure the very end of the
squeezed solder piece. Record the reading.
NOTE: If the solder hasn't been squeezed by the
piston, a larger piece of solder must be used.
Repeat procedure.
5. Using the opposite end of the solder pieces, insert
them down through the spark plug hole towards
the PTO-side and MAG-side of the cylinder. Push
on the solder until they contact the inner cylinder
bore.
6. Pull the recoil rope and crank the engine over sev-
eral times. Remove both pieces of solder from the
cylinder and measure the opposite squeezed ends
with a micrometer. Record reading.
NOTE: Measure from PTO to MAG-side of the pis-
PC001A
ton to accurately measure the squish gap. Never
measure across piston, exhaust side to opposite
side, as the piston will rock and the reading won't
be accurate.
Readings may vary from side to side.
NOTE: Make sure the smaller reading is 1.5 mm
(0.059 in.) or less.
Cylinder Trueness
1. Measure each cylinder in the three locations from
front to back and side to side for a total of six read-
ings.
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41