Cylinder Compression Test; Cylinder Head Cover Removal - Honda SH300 2006 Manual

CYLINDER HEAD/VALVES

CYLINDER COMPRESSION TEST

Remove the maintenance lid (page 3-4).
Warm up the engine to normal operating tempera-
ture.
Stop the engine and remove the spark plug cap and
spark plug (page 4-7).
Install a compression gauge into the spark plug
hole.
Open the throttle all the way and crank the engine
To avoid discharging
with the starter motor until the gauge reading stops
the battery, do not
rising. The maximum reading is usually reached
operate the starter
within 4 – 7 seconds.
motor for more
than 7 seconds.
COMPRESSION PRESSURE:
1,569 kPa (16.0 kg/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 the combustion chamber or
on the piston head

CYLINDER HEAD COVER REMOVAL

Remove the following:
– maintenance lid (page 3-4)
– luggage box (page 3-5)
– grab rail (page 3-5)
– body cover (page 3-6)
Disconnect the spark plug cap.
Remove the following:
– bolt and spark plug wire clamp
– bolt and water hose clamp
– two bolts and special washers
– cylinder head cover
– rubber seal
9-6
2 -1
, 228 psi) at 450 min (rpm)
COMPRESSION GAUGE
BOLTS/CLAMPS
HEAD COVER
BOLTS/WASHERS
PLUG CAP
SEAL