Suzuki RM-Z450 Owner's Service Manual page 71

4-6 MACHINE TUNING
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 5th 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
NKYT
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
* NKZT
Rich
* Included alternated parts
NKZT-1st
NKYT-1st
NKZT-2nd
NKYT-2nd
NKZT-3rd
NKYT-3rd
NKZT-4th
NKYT-4th
NKZT-5th
NKYT-5th
NKZT-6th
NKYT-6th
NKZT-7th
NKYT-7th
Part No.
NKZV 13383-35GK0
NKYV 13383-35GJ0
NKZU 13383-35GH0
NKYU 13383-35GG0
13383-35GF0
NKYT 13383-35GE0
NKZS 13383-35GD0
NKYS 13383-35GC0
NKZR 13383-35GB0
NKYR 13383-35GA0
O.D.
2.795
2.785
2.775
2.765
2.755
1
2
3
Lean
4
5
6
Rich
7