KTM 250 SX 2021 - Fork

TECHNICAL DATA 20
119
20.3 Carburetor
Carburetor type MIKUNI TMX 38
Carburetor identification number TMX 38 89
Needle position 3rd position from top
Jet needle 6BFY42-71 (6BFY43-71)
Main jet 450 (430, 440, 460, 470)
Idling jet 35 (30 / 32.5 / 37.5 / 40)
Choke nozzle 80
Needle jet S‑1
Idle air adjusting screw
Open 1.5 turns
20.3.1 Carburetor tuning
MIKUNI TMX 38
ASL TEMP
−20 … −7 °C
(−4 … 19 °F)
−6 … 5 °C
(21 …
41 °F)
6 … 15 °C
(43 …
59 °F)
16 … 24 °C
(61 …
75 °F)
25 … 36 °C
(77 …
97 °F)
37 … 49 °C
(99 …
120 °F)
2,301 …
3,000 m
(7,549 …
9,843 ft)
ASO
IJ
NDL
POS
MJ
1.5
35
42-71
3
450
1.5
32.5
42-71
3
440
2
32.5
42-71
3
430
1.5
32.5
43-71
2
430
1.5
30
43-71
2
420
1,501 …
2,300 m
(4,925 …
7,546 ft)
ASO
IJ
NDL
POS
MJ
1.5
32.5
43-71
3
450
1.5
35
42-71
3
450
1.5
32.5
42-71
3
440
2
32.5
42-71
3
430
1.5
32.5
43-71
2
430
1.5
30
43-71
2
420
751 …
1,500 m
(2,464 …
4,921 ft)
ASO
IJ
NDL
POS
MJ
1.5
35
43-71
3
460
1.5
32.5
43-71
3
450
1.5
35
42-71
3
450
1.5
32.5
42-71
3
440
2
32.5
42-71
3
430
1.5
32.5
43-71
2
430
301 …
750 m
(988 …
2,461 ft)
ASO
IJ
NDL
POS
MJ
1.5
37.5
43-71
3
470
1.5
35
43-71
3
460
1.5
32.5
43-71
3
450
1,5
35
42‑71
3
450
1.5
32.5
42-71
3
440
2
30
42-71
3
430
0 …
300 m (0
… 984 ft)
ASO
IJ
NDL
POS
MJ
1.5
37.5
43-71
3
470
1.5
35
43-71
3
460
1.5
32.5
43-71
3
450
1.5
35
42-71
3
450
1.5
32.5
42-71
3
440
2
32.5
42-71
3
430
ASL Sea level
TEMP Temperature
ASO Idle air adjusting screw open
IJ Idling jet
NDL Needle
POS Needle position from top
MJ Main jet