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Minor Carburetor Adjustment
(Idle Mi>tture
and
Idle Speed)
To adjust the idle speed, warm up the engine and push
the
choke/idle speed knob
down
to the off position. Turn
the
choke/idle speed knob clockwise to decrease engine speed,
or
counterclockwise
to
increase
engine speed.
NOTE
For a stable
idle speed,
turn the
choke/idle
speed knob at
least 6 turns (36 clicks) counterclockwise from the
fully
seated position.
Idle mixture can be adjusted by
turning the
air
screw;
turning
it
in richens the mixture, while turning it out leans the mixture.
To
adjust: turn the air screw
in
until it seats
lightly,
then back
it
out to the initial setting.
Standard: 2 turns out
Start the
engine.
When
the
engine
is
warm enough
to
run without the choke,
make fine adjustments in the air screw setting
until
the engine
revs ou smoothly.
Test the adjustment by accelerating away tram a slow corner.
Readjust as necessary.
A combination of a slightly rich mixture and an idle
speed
that's set too
high
may lead
to
plug fouling when shutting off
for tight sections of
the t rack.
Reduce
idle speed of this occurs.
Major Carburetor Adjustment
(For Temperature and
Altitude}
1 l
Check that
the
carburetor
is adjusted to the standard
settings.
NOTE
•
For
the
fo llowing
recommendations
to be
accurate,
you
must use these standard settings as a baseline.
The standard settings are ideal for a motorcycle with an
unmodified
engine
running
under
the
following
conditions:
32-to-1 premix ratio with
Honda HP2
2-Stroke Oil or
equivalent.
Altitude
-
sea level.
Temperature-
20°C
(68°F)
CAUTION
If
you are
using
a different premix
ratio
or engine
is
modified, you must adjust
the mixture
accordingly to
prevent engine damage.
Fuel System
(2) Jet needle (Tapered section)
-=::::::::::::
~
(3) Jet needle
(Straight
section}
(4) Slow jet and
Air
screw
Full
1/8
1/4
112
314
closed
1.10
1.08
-.....
,..___-
--
-.....
-.....
"---.....
--.....
-
......
- --
--
-
......
-
-.....
--
-.....
-,.._--.....
---
-
......
,_ ......
-
Full
opened
~
1.06
£
1.04
~
1.02
U..
1.00
5
0.98
·;:;
0.96
~
0.94
0
0.92
U
0.90
- -
!
~
0
m
(0
It)
590m
11600
II)
1000m
(3200 hi
2000m
(6500
ft)
3000m
(9800
It)
a.ea
0.86
-
,_
r--.:.._
'
r--.
I
I
-20°c - 10°c
0°c
10°c
20°c 30°c
40°C
-4°f
14°F
32°F
50°F
68°
F 86°F
104°F
(2)
Temperature
4-3
RICIERED
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