KTM 125 SX 2020 User Manual

TECHNICAL DATA 20
119
20.3 Carburetor
20.3.1 All 125 models
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
20.3.2 Carburetor tuning (All 125 models)
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

KTM 125 SX 2020 Specifications

General

Engine Type	1-cylinder, 2-stroke engine
Displacement	124.8 cm³
Bore x Stroke	54 mm x 54.5 mm
Starter	Kickstarter
Transmission	6-speed
Front Brake	Disc brake
Rear Brake	Disc brake
Ground Clearance	375 mm
Seat Height	950 mm
Clutch	Wet, multi-disc clutch, Brembo hydraulics
EMS	Kokusan
Frame	Central double-cradle type, 25CrMo4 steel
Front Suspension	WP XACT-USD, Ø 48 mm
Rear Suspension	WP XACT shock absorber with linkage
Fuel Tank Capacity	7.5 liters
Fuel System	Keihin carburetor