KTM 150 SX 2021 - Carburetor Tuning (150 SX)

TECHNICAL DATA 21
131
21.3.4 150 SX
Carburetor type MIKUNI TMX 38
Carburetor identification number TMX 38 88
Needle position 3rd position from top
Jet needle 6BFY42‑71 (6BFY43‑71)
Main jet 470 (460, 480, 490, 500, 520)
Idling jet 30 (25 / 27.5 / 32.5 / 35)
Choke nozzle 80
Needle jet S‑4
Idle air adjusting screw
open 1.5 turns
21.3.5 Carburetor tuning (150 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
30
42-71
3
470
1.5
32.5
43-71
2
470
2
32.5
43-71
2
460
2
30
43-71
2
460
1.5
27.5
43-71
2
450
1,501 …
2,300 m
(4,925 …
7,546 ft)
ASO
IJ
NDL
POS
MJ
1.5
32.5
42-71
3
480
1.5
30
42-71
3
470
1.5
32.5
43-71
2
470
2
32.5
43-71
2
460
2
30
43-71
2
460
1.5
27.5
43-71
2
450
751 …
1,500 m
(2,464 …
4,921 ft)
ASO
IJ
NDL
POS
MJ
2
35
42-71
3
490
1.5
32.5
42-71
3
480
1.5
30
42-71
3
470
1.5
32.5
43-71
2
470
2
32.5
43-71
2
460
2
30
43-71
2
460
301 …
750 m
(988 …
2,461 ft)
ASO
IJ
NDL
POS
MJ
1.5
35
42-71
3
500
2
35
42-71
3
490
1.5
32.5
42-71
3
480
1,5
30
42‑71
3
470
1.5
32.5
43-71
2
470
2
32.5
43-71
2
460
0 …
300 m (0
… 984 ft)
ASO
IJ
NDL
POS
MJ
1.5
35
42-71
3
500
2
35
42-71
3
490
1.5
32.5
42-71
3
480
1.5
30
42-71
3
470
1.5
32.5
43-71
2
470
2
32.5
43-71
2
460
ASL Sea level
TEMP Temperature
ASO Idle air adjusting screw open
IJ Idling jet
NDL Needle
POS Needle position from top
MJ Main jet