Honda VFR800F 2014 Service Manual page 190

CYLINDER HEADruALVES
CYLINDER COMPRESSION TEST
Warm
up the engine to
normal operating temperature.
Stop the engine and remove all the spark plugs
(page
3-6).
Disconnect the
fuel pump 3p
(Black) connector
(page
7-5).
lnstall the
compression
gauge
[1] into the spark
plug
hole.
Turn the
ignition switch
ON
with the engine
stop switch
Open the throtfle all the way and
crank the
engine with
the
starter
motor until the
giuge
reading
stopsiising.
The maximum reading
is usually reached within
4
_
7
seconds.
COMPRESSION PRESSURE:
1,575
kpa
(16.1 kgf/cm2,2ZB ps.l at 300 rpm
Low compression can
be caused
by:
-
Blown cylinder
head gasket
-
lmproper 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
Front;
Remove the following:
-
direct ignition coils (page 3-6)
-
PAIR check valves (page7-22)
-
CKP sensor 2P (Black) connector
[1]
-
radiator stay
[2]
Rear;
Remove the following:
-
direct ignition coils
(page 3,6)
-
air cleaner housing (page 7-12)
Remove the four bolts [1],
mounting rubbers
[2]. and
cylinder
head cover
[3].
Check that the mounting rubbers are
in
good
condition
and replace if necessary.
10-6