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2-66
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 several
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 several
times. Remove both pieces of solder from the cylin-
der and measure the opposite squeezed ends with a
micrometer. Record reading.
NOTE: Measure from PTO to MAG-side of the piston
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 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 readings.
FC044
2. The trueness (out-of-roundness) is the difference
between the highest and lowest reading. Maximum
trueness (out-of-roundness) must not exceed 0.004
in.
0725-586
PISTON SKIRT/CYLINDER
CLEARANCE
1. Measure each cylinder front to back about 1 in. from
the bottom of each cylinder.
2. Measure the corresponding piston skirt diameter at a
point 1 cm above the piston skirt at a right angle to
the piston-pin bore. Subtract this measurement from
the measurement in step 1. The difference (clear-
ance) must be within 0.0030-0.0041 in.
AC091
PISTON-RING END GAP
1. Place each piston ring in the wear portion above the
exhaust port of its respective cylinder. Use the piston
to position each ring squarely in each cylinder.
Manual
Table of Contents
Summary of Contents for Sno Pro 120 2011
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