Honda 88-91 NT650 HAWK GT Serviceanleitung Seite 44

MAINTENANCE
COOLING SYSTEM
Remove the radiator shroud and check the radiator air pas-
sages for clogging or damage.
Straighten bent fins or collapsed core tubes with a small flat
blade screwdriver as shown and remove insects, mud or any
obstructions with compressed air or low pressure water.
Replace the radiator if the air flow is restricted over more than
30% of the radiator's surface.
For radiator replacement, refer to page 5-5.
Make sure the hoses are in good condition.
Replace any hose that shows any sign of deterioration.
Check that all hose clamps are tight.
CYLINDER COMPRESSION
Warm up the engine to normal operating temperature.
-'-----------
If the engine must be running to do some work, make sure the
area is well-ventilated. Never run the engine in an enclosed
area.
The exhaust contains poisonous carbon monoxide gas that may
cause loss of consciousness and lead to death.
Stop the engine, disconnect both spark plug caps and remove
one spark plug.
NOTE
To measure the cylinder compression of each individual cyl-
inder and remove only one plug at a time.
Turn the engine stop switch OFF.
Insert the compression gauge. Open the throttle all the way
and crank the engine with the starter motor. Crank the engine
until the gauge reading stops rising. The maximum reading is
usually reached within
4-
7 seconds.
COMPRESSION PRESSURE:
1,324
±
196 kPa (13.5
±
2.0 kg/cm
2 ,
192
±
28 psi)
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
cc
(0.1-0.2
US. oz) of clean
engine oil into the cylinder through the spark plug hole and re-
check the compression.
If the compression increases from the previous value, check
the cylinder, piston and piston rings.
If the compression is the same as the previous value, check
the valves for leakage.
3-10
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(1) SCREWDRIVER