What causes Oil leaks from engine gaskets on the KTM 250 Duke?

Inspect around cylinder head and oil filter housing Estimated fix cost: $80-$200

What causes Throttle body/TPS sensor issues on the KTM 250 Duke?

Look for erratic idle, hesitation, or stalling behavior Estimated fix cost: $100-$300

Check welds around rear subframe with flashlight closely Estimated fix cost: $200-$500

Compress forks, check for oil seals leaking or stiction Estimated fix cost: $150-$400

Known issues to inspect before buying a used KTM 250 Duke. What to check and how much repairs cost.

MODERATE

Inspect around cylinder head and oil filter housing

Fix cost: $80-$200

MODERATE

Look for erratic idle, hesitation, or stalling behavior

Fix cost: $100-$300

SERIOUS

Check welds around rear subframe with flashlight closely

Fix cost: $200-$500

MINOR

Compress forks, check for oil seals leaking or stiction

Fix cost: $150-$400

☐Check service history and oil change intervals

☐Cold start test for smoke or rough idle

☐Inspect frame and subframe for cracks

☐Verify no dashboard warning lights present

Decent but maintenance-sensitive, buy with full history