4-8 MACHINE TUNING
Cable holder and washer
The cable holder and washer must be used as a
set.
Jet needle
NOTE:
SHADED: STANDARD
*: INCLUDED ALTERNATE PARTS
NONE: OPTIONAL PARTS
1 Adjustment of pilot system
1) Set the air screw as specified.
2) See if the selected pilot jet is correct or not by
judging the air/fuel mixture. If air/fuel mixture is
rich, replace it with smaller one. If air/fuel mix-
ture is lean, replace it with larger one.
2 Adjustment of main system
With the throttle opened 3/4 to full, make main sys-
tem adjustment monitoring the air/fuel mixture con-
dition after completion of pilot system settings.
* Make sure to adjust the main system before
adjusting the intermediate system.
3 Adjustment of intermediate system
Monitor the air/fuel mixture condition and adjust the
intermediate system by changing the needle clip
position or cable holder. (4-4)
4 Fine adjustment of slow system
After a proper setting has been obtained by the pro-
cedure 1 through 3, fine tune the carburetor
according to the actual race conditions.
1) Adjust the air/fuel mixture by turning the air
screw within 1/2 – 2 turns out.
2) If the mixture can not be adjusted by the air
screw within 1/2 – 2 turns out range, readjust
the pilot system 1.
5 Fine adjustment of intermediate system
Fine tune the intermediate system by changing the
needle type and clip position.
ITEM P/NO Color
Cable holder * 13518-36F20 Yellow
Washer * 13394-36F20 Red
Air/fuel
mixture
SIZE P/NO
Lean 6CHY17-66 13381-36F60
6CHY16-66 13381-36F50
6CHY17-65 13381-36F40
6CHY16-65 13381-36F30
6CHY17-64 13383-36FM0
6CHY16-64 13383-36FL0
6CHY17-63 13383-36FP0
6CHY16-63 13383-36FN0
6CHY17-62 13383-36FR0
6CHY16-62 13383-36FQ0
6CHY17-61 13381-36F00
6CHY16-61 13383-36FS0
6CHY17-60 13381-36F20
Rich 6CHY16-60 13381-36F10
Ex. Pilot jet #42.5
If air/fuel mixture is rich, replace it with #40
pilot jet. If air/fuel mixture is lean, replace it
with #45 slow jet.
Ex. Main jet #370
If air/fuel mixture is rich, replace it with
#360 main jet. If air/fuel mixture is lean,
replace it with #380 main jet.
1/2 turn out
3/4 turn out
1 turn out
1-1/4 turns out
1-1/2 turns out
1-3/4 turns out
2 turns out................ STD
STD
Lean
Rich
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