2-5
2
6. Holding the tappet adjuster at the proper clear-
ance, tighten the jam nut securely; then recheck
tappet clearance.
7. Place the cylinder head cover with a new O-ring
into position; then tighten the cover securely.
KM703
8. Install the timing inspection plug; then install the
oil through and spring into the crankshaft.
TR197
9. Install the crankcase cover aligning the oil hole
with the oil passage in the crankcase.
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 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 Gauge.
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: The compression should be within a
range of 210-230 psi in the full-open throttle posi-
tion.
6. If compression is abnormally low, verify the fol-
lowing items.
A. Starter cranks engine over.
B. Gauge functions properly.
C. Throttle lever in the full-open position.
D. Valve/tappet clearance correct.
E. Valve not bent or discolored.
F. Valve seat not discolored.
NOTE: To service valves, see Section 3.
7. Pour approximately 30 ml (1 fl oz) of oil into the
spark plug hole, attach the gauge, and test com-
pression.
8. If compression is now evident, service the piston
rings (see Section 3).
Spark Plug
A light brown insulator indicates that the plug is cor-
rect. 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.
ATV-0051
! WARNING
Always wear safety glasses when using compressed air.
CAUTION
Before removing the spark plug, make sure to clean
the area around the spark plug. Dirt could enter
engine when removing or installing the spark plug.
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