MACHINE TUNING 4-9
Jet needle
SHADED: STANDARD
* : INCLUDED ALTERNATE PARTS
NONE : OPTIONAL PARTS
1 Adjustment of slow system
1) Set the pilot screw as specified.
2) See if the selected slow 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 slow 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.
4 Final adjustment of slow system
After a proper standard setting has been obtained
by the procedure
1 through
3, fine tune the carbu-
retor according to the actual race conditions.
1) Adjust the air/fuel mixture by turning the pilot
screw within 3/4 – 2 and 1/4 turns back.
2) If the mixture can not be adjusted by the pilot
screw within 3/4 – 2 and 1/4 turns back range,
readjust the slow system
1.
5 Final adjustment of intermediate system
Fine tune the intermediate system by changing the
needle type and clip position.
Air/fuel
mixture
SIZE P/NO.
Lean NLDV 13383-10H90
NLCV 13383-10H80
NLDU 13383-10H70
NLCU 13383-10H60
* NLDT 13383-10H50
NLCT 13383-10H40
NLDS 13383-10H30
NLCS 13383-10H20
NLDR 13383-10H10
Rich NLCR 13383-10H00
Ex. Slow jet #45
If air/fuel mixture is rich, replace it with #42
slow jet. If air/fuel mixture is lean, replace
it with #48 slow jet.
Ex. Main jet #170
If air/fuel mixture is rich, replace it with
#168 main jet. If air/fuel mixture is lean,
replace it with #172 main jet.
Air/fuel mixture Pilot screw turn back
Lean 3/4 turn back
1 turn back
1 and 1/4 turns back
1 and 1/2 turns back
1 and 3/4 turns back
2 turns back
Rich 2 and 1/4 turns back
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