KTM 125 SX
Maintenance specs for 1 variant of the KTM 125 SX — from 1998 to 2026.
1998–2026 KTM 125 SX
124.8cc Single-Cylinder 2-Stroke Liquid-Cooled MX (125 SX) · Chain
30 hp / lb-ft
Transmission
Type6-Speed Manual (gearbox oil)
FluidMotorex Top Speed 4T 15W-50
Drain & fill0.64 qt
Fuel
Tank1.9 gal
TypePremium 91 + 2-stroke oil premix
Tires
Front80/100-21
Rear100/90-19
Pressure (front)15 PSI
Pressure (rear)15 PSI
Service Intervals
Trans service300 mi
Coolant flush1,500 mi
Spark plugs600 mi
Air filter150 mi
Drive belt600 mi