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Fuel System
2) Find your correction factor on the chart.
Example:
1,000
meters !3,200
ftl
altitude with an
air
temperature of 35°C !95°F). The correction factor is 0.94.
3)
Using
you correction factor, select
the
correct main and
slow jets.
EXAMPLE: For
a correction
factor
of
0.94, multiply
the jet
sile by that number.
Main jet
#172
x
0.94
=
#162
Slow jet #58
x
0.94
=
#55
4
)
Find
your factor on the Jet
Needle/
Air
Screw Chart
and ad·
just the jet needle clip
position
and air screw opening as
shown.
EXAMPLE:
For
a correction
factor
of 0.94
,
rai
se
the needle
clip one
position
and turn out
the air
screw one extra turn.
Jet needle clip setting
3rd groove from top
minus
1-
2nd groove.
from
top.
Air
screw opening
2
+
1 turn
=
3 turns out.
CORREC-
TION
FACTORS
JET
NEEDLE
CLIP
POSITION
AIR
SCREW
OPENING
JET NEEDLE/AIR SCREW CHART
1.06
1.06-
1.02-
0.98-
0.94
m
1.02
0.98
0.94
0'
above
below
Lower
Raise
clip
STANDARD
clip
,
,
groove
groove
,
1/2
STAND-
1/2
,
turn
turn
ARD
turn
turn
In
In
0"(
0",
5) Start the engine
and
let it warm
up for
a
few minutes.
Adjust the idle speed, as necessary.
Test
ride the motorcycle. Does it
perform
poorly
in any of
the
speed
range? If
so, make adjustments as
required
.
NOTE
The correction factors will get you very close to
the
ideal jetting.
However, because
of differences in pressure and
humidity,
you may need to fine
tune
the carburetor for race day conditions.
Just off idle:
Engine
blubbers
(rich)-turn out the
air
screw
, ,4
turn.
Engine surges Oeanl
-
turn
in the air screw
1/
4 turn.
NOTE
The minimum to maximum range of air screw adjustments is 1 to 3 turns
out
.
If you must exceed these limits, you need
the next smallest slow jet
or
the next largest slow jet. Select the correct slow jet (page 1 -21) and
begin
again from
step
4.
On the top end:
Engine
blubbers
(richl-
go
to next smaller main jet.
Engine surges (leanl
-
go to next larger main jet.
CAUTION
To prevent
engine
damage
,
always adjust the
main jet (top endl before
adjusting
the jet needle
!mid-rangel.
Alway
s
jet
one
number
on
the rich
side
for
safety.
In the
mid-range:
Engine
blubbers (richl
-
Iower
the
jet needle
by
raising the needle clip one position.
Engine surges {leanl
-
raise
the jet needle by
lowering the
needle clip one
position.
61
Test
ride
again
and readjust as required.
NOTE
If you
used the
correction factors correctly, it shouldn't
be
necessary
to
adjust more than one increment,
richer
or
leaner.
If
a very
large
adjustment is required,
there may
be something wrong
elsewhere.
Check fo
r
worn crankshaft seals, air leaks, blocked exhaust
or
fuel
system, or a
dirt
y
air
cleaner element.
4-4
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