Suzuki RM-Z250 Owner's Service Manual page 70

4-9 MACHINE TUNING
Jet needle
Air/fuel
SIZE
mixture
Lean NLDV
NLCV
NLDU
NLCU
NLDT
* NLCT
NLDS
NLCS
NLDR
Rich NLCR
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.
Ex. Slow jet #42
If air/fuel mixture is rich, replace it with #40
slow jet. If air/fuel mixture is lean, replace
it with #45 slow jet.
2 Adjustment of main system
With the throttle opened 3/4 to full, make main sys-
P/NO. tem adjustment monitoring the air/fuel mixture con-
dition after completion of slow system settings.
13383-10H90
* Make sure to adjust the main system before
13383-10H80
13383-10H70
13383-10H60
13383-10H50
13383-10H40
13383-10H30
13383-10H20
3 Adjustment of intermediate system
13383-10H10
13383-10H00
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
Lean
Rich
2) If the mixture can not be adjusted by the pilot
5 Final adjustment of intermediate system
Fine tune the intermediate system by changing the
needle type and clip position.
adjusting the intermediate system.
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.
screw within 1 and 1/4 – 2 and 3/4 turns back.
Air/fuel mixture
screw within 1 and 1/4 – 2 and 3/4 turns back
range, readjust the slow system 1.
1
2
Lean
3
4
5
Rich
6
7
Pilot screw turn back
1 and 1/4 turns back
1 and 1/2 turns back
1 and 3/4 turns back
2 turns back
2 and 1/4 turns back
2 and 1/2 turns back
2 and 3/4 turns back