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Used KTM
Used KTM 125 SX for sale
The KTM 125 SX is a 125cc two stroke motocross bike, built for the track and sold on hours rather than kilometres.
5 KTM 125 SXs are listed on MWMX right now (2003 to 2026 models), asking $4,200 to $10,000, most around $7,700. Every listing shows the hours, photos and where the bike is, and you can message the seller or make an offer without an account.
A KTM 125 SX is cheap to keep but ask when the piston was last done: a race two stroke wants a top end every 20 to 40 hours. Check for a clean, unscored bore, a working power valve, no crank seal leaks (smoke on the pipe side, or gearbox oil going down) and that the pipe is not caved in. Ask for the service history (members log theirs in the MWMX Digital Garage and it shows on the listing), look at the hours against the price, and check the frame and swingarm for cracks, the fork seals for weeping and the linkage and steering head bearings for play.
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Good to know
- How much is a used KTM 125 SX?
- The KTM 125 SXs listed on MWMX today are asking $4,200 to $10,000, with most around $7,700. Year, hours and whether it has been raced move the price more than anything else; a bike with a logged service history sells faster and for more.
- How many hours is a lot on a KTM 125 SX?
- Hours on a two stroke are about the top end, not the bike: a fresh piston resets the clock. Under 20 hours since a top end is fresh; the bottom end (crank and main bearings) is good for 150 to 250 hours on most two strokes before it wants doing.
- What should I check before buying a used KTM 125 SX?
- A KTM 125 SX is cheap to keep but ask when the piston was last done: a race two stroke wants a top end every 20 to 40 hours. Check for a clean, unscored bore, a working power valve, no crank seal leaks (smoke on the pipe side, or gearbox oil going down) and that the pipe is not caved in. Ask for the service history (members log theirs in the MWMX Digital Garage and it shows on the listing), look at the hours against the price, and check the frame and swingarm for cracks, the fork seals for weeping and the linkage and steering head bearings for play.
- Can I buy a KTM 125 SX on MWMX without an account?
- Yes. Every listing is public: message the seller, make an offer or apply for finance straight from the page. An MWMX account adds saved searches, a Digital Garage for the service history and member pricing on parts once you own it.
- How do I sell my KTM 125 SX on MWMX?
- List it free from the Sell page in about five minutes: photos, hours, location and your price. No listing fee and no sale fee on bikes. The listing goes out to riders looking for a 125 SX and the MWMX Marketplace ads on Google.
Selling a KTM 125 SX?
List it free on the MWMX Marketplace. No listing fee, no sale fee, and buyers who actually ride. Takes five minutes.
List your bike free