KTM 150 SX 2021 - Carburetor; Carburetor Tuning (125 SX)

TECHNICAL DATA 21
129
21.3 Carburetor
21.3.1 125 SX
Carburetor type MIKUNI TMX 38
Carburetor identification number TMX 38 87
Needle position 2nd position from top
Jet needle 6BFY43‑71 (6BFY42‑71)
Main jet 500 (480, 490, 520, 540, 560)
Idling jet 35 (30 / 32.5 / 37.5 / 40)
Choke nozzle 80
Needle jet S‑7
Idle air adjusting screw
open 1.5 turns
21.3.2 Carburetor tuning (125 SX)
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
43-71
2
500
2
32.5
43-71
2
500
2
30
43-71
2
490
2
30
43-71
2
480
1.5
30
42-71
2
480
1,501 …
2,300 m
(4,925 …
7,546 ft)
ASO
IJ
NDL
POS
MJ
2
37.5
43-71
2
520
1.5
35
43-71
2
500
2
32.5
43-71
2
500
2
30
43-71
2
490
2
30
43-71
2
480
1.5
30
42-71
2
480
751 …
1,500 m
(2,464 …
4,921 ft)
ASO
IJ
NDL
POS
MJ
1.5
35
42-71
3
520
2
37.5
43-71
2
520
1.5
35
43-71
2
500
2
32.5
43-71
2
500
2
30
43-71
2
490
2
30
43-71
2
480
301 …
750 m
(988 …
2,461 ft)
ASO
IJ
NDL
POS
MJ
1.5
37.5
42-71
3
540
1.5
35
42-71
3
520
2
37.5
43-71
2
520
1,5
35
43‑71
2
500
2
32.5
43-71
2
500
2
30
43-71
2
490
0 …
300 m (0
… 984 ft)
ASO
IJ
NDL
POS
MJ
1.5
37.5
42-71
3
560
1.5
35
42-71
3
540
2
37.5
43-71
2
540
1.5
35
43-71
2
520
2
32.5
43-71
2
500
2
30
43-71
2
490
ASL Sea level
TEMP Temperature
ASO Idle air adjusting screw open
IJ Idling jet
NDL Needle