Cylinder Compression; Cylinder Head Cover Removal - Honda GL1800 Service Manual

CYLINDER HEAD/VALVE

CYLINDER COMPRESSION

Warm up the engine to normal operating tempera-
ture. Stop the engine.
Remove the seat (page 2-5) and disconnect the 5P
gray connector from the fuel pump.
Remove the spark plug caps and spark plugs
(page 3-8).
Install the compression gauge into the spark plug
hole.
Shift the transmission into neutral.
Open the throttle all the way and crank the engine
with the starter motor until the gauge reading stops
rising. The maximum reading is usually reached
within 4–7 seconds.
COMPRESSION PRESSURE:
1,383 kPa (14.1 kgf/cm
Low compression can be caused by:
– blown cylinder head gasket
– improper valve adjustment
– valve leakage
– worn piston ring or cylinder
High compression can be caused by:
– carbon deposits in combustion chamber or on
piston head

CYLINDER HEAD COVER REMOVAL

Remove the following:
– five rubber plugs
– five socket bolts
– cylinder head side cover
– bolt and wire clamp
– spark plug wires from clip
– three rubber plugs
– six socket bolts (left cylinder head cover)
– five socket bolts (right cylinder head cover)
– cylinder head cover
8-6
2
, 201 psi) at 300 rpm
P CONNECTOR
OMPRESSION GAUGE