Pre-Owned 2023 KTM 125 SX – Lightweight High-Performance 2-Stroke Motocross Bike
The 2023 KTM 125 SX is built for riders who demand explosive performance, razor-sharp handling, and championship-level technology in a lightweight motocross package. Powered by a high-revving 125cc liquid-cooled 2-stroke engine, this bike delivers strong mid-range punch and thrilling top-end power, making it a favorite among competitive racers and aspiring pros.
Featuring KTM’s advanced chromoly steel frame, premium WP XACT suspension, and race-ready ergonomics, the 125 SX offers precise control, exceptional stability, and confidence-inspiring handling on any track. Modern updates including fuel injection (TBI), a lightweight electric start, and Brembo hydraulic brakes ensure consistent performance in all conditions.
Fast, agile, and race-proven—the 2023 KTM 125 SX is designed to dominate the motocross track.
- Engine & Drivetrain
- Engine Type 124.8 cc Single‑Cylinder 2‑Stroke, Liquid‑Cooled with EFI
- Displacement 124.8 cc
- Bore x Stroke 54.0 mm × 54.5 mm
- Fuel System Keihin Electronic Fuel Injection (EFI) with 39 mm Throttle Body
- Ignition Vitesco Technologies EMS
- Starter Electric Starter
- Transmission 6‑Speed Manual
- Clutch Wet Multi‑Disc DS Clutch with Brembo Hydraulics
- Final Drive 520 X‑Ring Chain
- Suspension & Brakes
- Front Suspension WP XACT Inverted USD Fork, Ø 48 mm; ~310 mm Travel
- Rear Suspension WP XACT Monoshock with Linkage; ~300 mm Travel
- Front Brakes Single 260 mm Disc Brake
- Rear Brakes Single 220 mm Disc Brake
- Tires & Wheels
- Front Tire 80/100‑21
- Rear Tire 100/90‑19
- Wheels Aluminum Spoked Wheels
- Dimensions & Capacities
- Wheelbase 58.5 in (1485 mm)
- Seat Height 37.7 in (958 mm)
- Ground Clearance 14.1 in (359 mm)
- Fuel Capacity 1.9 gal (7.2 L)
- Dry Weight 203.7 lb (92.4 kg)
- Chassis & Frame
- Frame Type Central Double‑Cradle‑Type 25CrMo4 Steel
- Features & Equipment
- Performance Focus Mass Centralization, Updated Chassis & New Ergonomics
- Electric Start Standard on Competition Model
