Honda CLYMER VF500C 500F (1984-1985) [166/350] Chapter six
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Honda CLYMER VF500C 500F (1984-1985) [166/350] Chapter six

Honda CLYMER VF500C 500F (1984-1985) [166/350] Chapter six
156
CHAPTER SIX
2. Start the engine
and
let it reach normal
operating temperature. Stop-and-go riding for
approximately
10-15 minutes is
sufficient.
Turn
off
the engine.
3. Connect a
portable
tachometer
following
the
manufacturer's instructions. The
bike's tach
is not
accurate enough at
low rpm.
4. Turn
each
pilot
screw clockwise, as
viewed
from
the side of the carburetor, the
following
number
of
turns:
a.
Magna models: I L/2
turns.
b.
Interceptor models:
3/4
turn.
5.
Restart
the engine and turn the large
idle
screw
(Figure
37) to achieve an
idle
speed listed
in
Table
1.
6.
Turn
the
engine
offand disconnect the
portable
tachometer.
7.
Install
new
pilot
screw
plugs
as descirbed
in
this
chapter.
8.
When
the bike
is returned
to
lower
elevations
(near
sea
level), the
pilot
screws
must
be
returned
to
their
original
position
and' the
idle
speed
readjusted
to
the
idle
speed
listed in Table 1.
Rejetting The
Carburetors
Do
not try to solve a
poor-running
engine
problem
by
rejetting
the carburetors
if
all
of
the
following
conditions
hold
true.
l. The
engine
has held
a
good
tune
in
the
past
with
the standard
jetting.
2. The
engine
has not
been
modified.
3.
The motorcycle
is
being operated
in
the same
geographical
region
under
the same
general
climatic conditions as in the
past.
4. The motorcycle was
and
is
being
ridden
at
average
highway
speeds.
If
those
conditions all
hold
true, the chances are
that the
problem
is
due to a malfunction in
the
carburetor or
in
another component
that
needs
to
be adjusted or
repaired.
Changing carburetor
jet
size
probably
won't
solve the
problem.
Rejetting
the
carburetors may
be
necessary if
any of the
following
conditions
hold
true:
l. A non-standard
air filter element is being used.
2. A non-standard
exhaust system
is installed
on
the
motorcycle.
3.
Any
of the top end components in
the engine
(pistons,
cams,
valves,
compression ratio,
etc.)
have
been
modified.
4. The motorcycle is in
use
at considerably
higher
or
lower
altitudes or
in
a considerably hotter
or
colder climate than
in
the
past.
5.
The motorcycle is
being operated at
considerably higher speeds
than before and
Ift
-\*J/
changing to colder
spark
plugs
does
not
solve the
problem.
6. Someone
has
previously
changed the carburetor
jetting.
7. The
motorcycle
has
never held
a
satisfactory
engine tune.
If it is necessary to rejet the carburetors,
check
with
a
dealer
or
motorcycle
performance
tuner
for
recommendations as to the
size ofjets to
install
for
your
specific situation.
If
you
do
change the
jets,
do
so only one size at
a
time. After
rejetting, test
ride
the bike and
perform
a spark
plug
test;
refer
to
Reading Spark
Plugs in
Chapter
Three.
AIR FILTER CASE
Removal/Installation
l. Remove both
side covers.
Remove
the
seat as
described
in
Chapter
Twelve.

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