Suzuki RM-Z250 Owner's Service Manual page 67

Jet needle clip position
To adjust the air/fuel mixture with the jet needle, change position
of the needle clip which is set in the 4th groove. The lower
groove the clip is moved to, the higher the jet needle rises and
the larger the clearance with the main nozzle becomes, resulting
in a richer air/fuel mixture ratio.
Air/fuel mixture Needle type and clip position
Lean
Rich
Needle number
NLDT
O.D.
Changing the needle itself controls air/fuel mixture ratio particu-
larly on lower mid-throttle opening. The smaller the O.D., the
richer the air/fuel mixture becomes.
Air/fuel mixture Needle Number
Lean
* NLCT
Rich
* Included alternated parts
NLDT-1st
NLCT-1st
NLDT-2nd
NLCT-2nd
NLDT-3rd
NLCT-3rd
NLDT-4th
NLCT-4th
NLDT-5th
NLCT-5th
NLDT-6th
NLCT-6th
NLDT-7th
NLCT-7th
Part No.
NLDV 13383-10H90
NLCV 13383-10H80
NLDU 13383-10H70
NLCU 13383-10H60
NLDT 13383-10H50
13383-10H40
NLDS 13383-10H30
NLCS 13383-10H20
NLDR 13383-10H10
NLCR 13383-10H00
O.D.
2.795
2.785
2.775
2.765
2.755
MACHINE TUNING 4-6
1
2
Lean
3
4
5
6 Rich
7