CYLINDER HEADNALVES
CYLI
To
avoid
discharging the
battery,
do
not
operate the starter
for more than
7
seconds.
CYLIND
10-6
Warm
up
the engine to normal operating temperature.
Stop the engine and remove the spark plug cap
and
spark plug (page 3-9).
Install a compression gauge
[1]
into the spark plug hole.
Open the throttle all the way
and
crank the engine with
the starter until the gauge reading stops rising.
The maximum reading
is
usually reached within 4 - 7
seconds.
COMPRESSION PRESSURE:
1,098 kPa (11.2 kgf/cm2, 159.3 psi) at 850 rpm
If compression
is
high, it indicates that carbon deposits
have accumulated
on
the combustion chamber and/or
the piston crown.
If compression
is
low, pour 3 - 5
cm
3
of clean engine oil
into the cylinder through the spark plug hole and
recheck the compression.
If the compression increases from the previous value,
check the cylinder, piston and piston rings.
• Leaking cylinder head gasket
• Worn piston ring
• Worn cylinder and piston
If compression
is
the same
as
the previous value, check
the valves for leakage.
REMOVAL
Remove the battery box (page 2-26).
Disconnect the crankcase breather hose
[1]
from the
cylinder head cover.
Remove the bolt [2] and release the hose clamp [3].
Remove the bolts [1], cylinder head cover
[2]
and
rubber seal [3].
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