10-5
dummyheaddummyhead
CYLINDER HEAD/VALVES
CYLINDER COMPRESSION TEST
Remove the following:
– Shroud/side cover (NC700X/XA/XD) (page 2-14)
– Shelter/side cover (NC700S/SA/SD) (page 2-15)
– Lower cowl (page 2-28)
Warm the engine to normal operating temperature.
Stop the engine and remove the all spark plug caps and
spark plugs (page 3-8).
Disconnect the fuel pump 1P (Black) connector [1].
Install a compression gauge [1] into the spark plug hole.
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.
Low compression can be caused by:
– Blown cylinder head gasket
– Improper valve clearance 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/INSTALLATION
Remove the bolts [1] and radiator lower stay [2].
Release the radiator boss from the radiator mounting
rubber [3].
STANDARD:
1,775 kPa (18.1 kgf/cm
2
, 257 psi) at 470 min
-1
(rpm)
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