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VALVE
GEARING
Tappet
clearance
I
See
fig.
23)
Checking
valve timing
4B
Every
3000
kms.
(1800 miles)
or
any
time
valve
operallon
is too noisy,
check
tappet
clearance.
This
adjustment
is
made on a
cold
engine
with the
piston at TOe and
both valves closed
while
the piston
is
on its
maximum com·
pression
stroke.
Using
th
e wrench supplied
in the tool
ki
t,
undo
nut
A
and
screw
In or out screw
B.
Correct clearance
is
:
-
Inlet
valve
-
Exhaust valve
0.15 mm.
(.0059")
0.25
mm. [.0098")
Use
a
feeler gauge (C)
to
check this
clea·
ranee.
When this Is excessive. there will
be
noisy
valve
operation.
If
it
is less, the valves m<lY
not close
fully
cau
sing
compression loss, overheating of
the
engine.
etc.
On
<I
new
engine.
this adjustment must be
made after
the first
500 kms. (300
miles).
The
engine
Is
timed when
the
gears are set
as
shown at
A
and
B
In fig.
24.
A proper
check
of valve
timing
Is always done
better
in any officially
appointed Mota GUZZi dealer
shop.
Fig.
23
"
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