2021 KTM 350 SX-F — Should You Buy One?
Typical asking price: $6,000–$8,500. There is 1 high-severity known issue you need to know before handing over a check.
Kestrel Take
The do-it-all motocross bike — the 350 splits the difference between a nimble 250 and a powerful 450, and it's a favorite for that reason. Race-only and maintenance-intensive like all modern MX four-strokes. Documented service hours and honest crash history are the whole decision.
What we checked
Checked against public records, 2026-09-25
We checked NHTSA for this exact year and model and it returned nothing. That is a fact about the database, not a clean bill of health — it usually means few of these were sold or few owners filed. What follows is our own write-up, unreconciled.
Known Issues for the 2021 KTM 350 SX-F
Ranked by wallet impact. These are documented, recurring problems — not freak accidents. How we decide that.
A competition engine needing frequent service measured in hours; verify the hour meter and rebuild log.
Repair cost (estimate): $300-$1,200
Source: not yet checked against public records.
Inspect for crash damage, bent parts, cracked frame, and worn suspension.
Repair cost: Not a repair — an ownership-cost warning, not a mechanical fault
Source: not yet checked against public records.
Verify clutch and suspension service.
Repair cost (estimate): $300-$1,000
Source: not yet checked against public records.
Walk-Away Red Flags
- ✗No hour meter or service log
- ✗Overdue service
- ✗Hard-crash damage
- ✗A neglected race bike
Good Signs
- ✓Documented hour-based service
- ✓Low hours, no crash damage
- ✓Serviced suspension, sensible use
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Found a specific KTM 350 SX-F?
This page covers what goes wrong on the 2021 KTM 350 SX-F in general. A free read looks at the one you're considering— it checks that seller's asking price against the market and names the issues that matter most for this exact year.
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Known issues on this page are based on documented owner reports, NHTSA complaints, class-action records, and manufacturer technical service bulletins. Individual vehicles vary. A pre-purchase inspection by a trusted mechanic is always worth doing.
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