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8
CD652
CD656A
4. Using a feeler gauge, check each valve tappet clear-
ance. If the clearance is not 0.10 mm, loosen the jam
nut and rotate the tappet adjuster screw until the
clearance is within specifications. Tighten each jam
nut securely after completing the adjustment.
CD659
YT170
5. Check the valve/tappet clearance after the jam nut has
been tightened to ensure the clearance did not change.
CD658
6. Install the valve cover and tighten the four cap
screws to 7 ft-lb 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 9 ft-lb; then
install the spark plug wire.
Testing Engine
Compression
To test engine compression, use the following procedure.
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 tension
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 posi-
tion, 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 follow-
ing 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.
! WARNING
Always wear safety glasses when using compressed
air.
Manual
Table of Contents
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