TECHNICAL SPECIFICATIONS

KTM 125 SX 2026 (EE. UU.)

2026–2026 125 SX (2026) US

125 cc 2T

MotorDataBook

Key specifications

The essentials of this version at a glance.

80/100 - 21 TT
Misura pneumatico anteriore
✓
100/90 - 19 TT
Misura pneumatico posteriore
✓
2 Ah
Capacità della batteria
✓
Protección anticongelante como mínimo hasta −25 °C
Specifica del liquido di raffreddamento
✓
1,2 L
Capacità del liquido di raffreddamento
✓
Batería de iones de litio
Tecnologia della batteria
✓
DOT 4 / DOT 5.1
Specifica del liquido freni
✓
JASO T903 MA2
Specifica del fluido trasmissione
✓
2 items

Trasmissione e catena cinematica

Specifica del fluido trasmissione
JASO T903 MA2 ✓
Aceite del cambio (motor de 2 tiempos).
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 167 Verification: Verified Open document
Capacità totale fluido trasmissione
0,8 L ✓
Aceite del cambio (motor de 2 tiempos): cantidad de llenado del aceite que se cambia.
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 151 Verification: Verified Open document
7 items

Freni

Specifica del liquido freni
DOT 4 / DOT 5.1 ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 168 Verification: Verified Open document
Diametro disco freno anteriore
260 mm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 151 Verification: Verified Open document
Spessore minimo disco freno anteriore
2,5 mm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 151 Verification: Verified Open document
Diametro disco freno posteriore
220 mm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 151 Verification: Verified Open document
Spessore minimo disco freno posteriore
3,5 mm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 151 Verification: Verified Open document
Spessore minimo pastiglie freno anteriori
1 mm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 99 Verification: Verified Open document
Spessore minimo pastiglie freno posteriori
1 mm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 106 Verification: Verified Open document
2 items

Wheels and tyres

Misura pneumatico anteriore
80/100 - 21 TT ✓
El manual da el tamaño según la versión; se toma la fila «Todos los modelos SX».
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 152 Verification: Verified Open document
Misura pneumatico posteriore
100/90 - 19 TT ✓
El manual da el tamaño según la versión; se toma la fila «Todos los modelos SX».
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 152 Verification: Verified Open document
5 items

Dati specifici motocicli

Misura catena di trasmissione
5/8 x 1/4" ✓
Paso y ancho interior de la cadena en pulgadas, tal como los da el manual.
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 152 Verification: Verified Open document
Gioco minimo catena di trasmissione
58 mm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 87 Verification: Verified Open document
Gioco massimo catena di trasmissione
61 mm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 87 Verification: Verified Open document
Coppia di serraggio asse anteriore
35 Nm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 163 Verification: Verified Open document
Coppia di serraggio asse posteriore
80 Nm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 163 Verification: Verified Open document
2 items

Motore e fluidi

Specifica del liquido di raffreddamento
Protección anticongelante como mínimo hasta −25 °C ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 168 Verification: Verified Open document
Capacità del liquido di raffreddamento
1,2 L ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 151 Verification: Verified Open document
2 items

Filtri e ricambi di manutenzione

Riferimento OEM candela
NGK BR10 ECMVX ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 150 Verification: Verified Open document
Distanza tra gli elettrodi della candela
0,8 mm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 150 Verification: Verified Open document
3 items

Impianto elettrico e batteria

Tensione nominale batteria 12 V
12 V ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 153 Verification: Verified Open document
Capacità della batteria
2 Ah ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 153 Verification: Verified Open document
Tecnologia della batteria
Batería de iones de litio ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 153 Verification: Verified Open document
3 items

Coppie di serraggio

Coppia di serraggio candele
25 Nm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 158 Verification: Verified Open document
Coppia di serraggio pinza freno anteriore
25 Nm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 161 Verification: Verified Open document
Coppia di serraggio tappo di scarico trasmissione
20 Nm ✓
Sources and verification (1)
Primary source ✓ Official Publisher: KTM Sportmotorcycle GmbH (buscador oficial de manuales) Document: 125 SX 2026 – Manual de instrucciones, EE. UU. en español (26_3240232_es_BA) Reference: 158 Verification: Verified Open document

How we handle technical data

MotorDataBook prioritises official documentation and shows conditions, notes and traceability whenever a figure needs context. Unconfirmed values should not be presented as facts.