Buyer Research

2021 Yamaha YZ250 (2-stroke) — Should You Buy One?

Typical asking price: $5,000–$7,500. There are 2 high-severity known issues you need to know before handing over a check.

Kestrel Take

The two-stroke that never dies — a light, simple, ferociously fun off-road-only motocross/enduro bike Yamaha has refined for decades. Not street-legal. Two-strokes are simple to rebuild but need it regularly; the top-end hours and hard-race abuse are the entire inspection.

Known Issues for the 2021 Yamaha YZ250 (2-stroke)

Ranked by wallet impact. These are documented, recurring problems — not freak accidents.

Two-stroke top-end wear (piston/rings)High — wallet impact

Two-strokes need frequent top-end rebuilds (often every 20-40 hours of hard use); a piston and ring is cheap but overdue ones risk a seizure. Verify hours and rebuild history.

Repair cost range: $150-$600

Race and jump abuseHigh — wallet impact

A motocross bike ridden hard; inspect for crash damage, bent parts, cracked frame, and worn suspension.

Repair cost range: Varies

Not street-legalMedium

Off-road/closed-course only in most states; a limitation, not a defect.

Repair cost range: n/a

Clutch, suspension, and jettingMedium

Hard use wears the clutch and suspension; verify jetting and service.

Repair cost range: $200-$800

Walk-Away Red Flags

✗No top-end hours or rebuild history
✗Hard-crash or bent-frame damage
✗A seized or hard-to-start engine
✗Neglected suspension

Good Signs

✓Fresh top-end with documented hours
✓No crash damage
✓Serviced suspension, sensible use

Found a specific Yamaha YZ250 (2-stroke)?

This page covers what goes wrong on the 2021 Yamaha YZ250 (2-stroke) in general. The Kestrel report covers this specific car— the asking price vs. market, the photos, the seller's description, and a BUY / NEGOTIATE / WALK AWAY verdict with a negotiation script.

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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.