2-6
CD658
5. Check the valve/tappet clearance after the jam
nut has been tightened to ensure that the clear-
ance did not change.
CD658
6. Install the valve cover and tighten the four cap
screws to specifications (see Section 10) using a
crisscross pattern; then install the breather tube.
7. Install the fan shroud and tighten the two cap
screws securely. Tighten the self-tapping screws
snug taking care not to strip the plastic cover.
8. Install the spark plug and tighten to specifica-
tions (see Section 10); then install the spark plug
wire.
Testing Engine
Compression
To test engine compression, use the following pro-
cedure.
1. Remove the high tension lead from the spark
plug.
2. Using compressed air, blow any debris from
around the spark plug.
3. Remove the spark plug; then attach the high ten-
sion lead to the plug and ground the plug on the
cylinder head well away from the spark plug
hole.
4. Attach the Compression Tester Kit (p/n
0444-213).
NOTE: The engine must be warm and the battery
must be fully charged for this test.
5. While holding the throttle lever in the full-open
position, crank the engine over with the electric
starter until the gauge shows a peak reading
(five to 10 compression strokes).
NOTE: Compression should be within a range of
195-230 psi in the full-open throttle position.
6. If compression is abnormally low, inspect the
following items.
A. Verify starter cranks engine over.
B. Gauge is functioning properly.
C. Throttle lever in the full-open position.
7. Pour 29.5 ml (1 fl oz) of oil into the spark plug
hole, reattach the gauge, and retest compression.
8. If compression is now evident, service the pis-
ton rings (see Section 3).
Spark Plug
A light brown insulator indicates that the plug is
correct. A white or dark insulator indicates that the
engine may need to be serviced or the carburetor
may need to be adjusted. To maintain a hot, strong
spark, keep the plug free of carbon.
! WARNING
Always wear safety glasses when using compressed
air.
! CAUTION
Before removing the spark plug, be sure to clean the
area around the spark plug. Dirt could enter engine
when removing or installing the spark plug.
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