What causes WP fork seal leaks and stiction on the Ktm 990 Duke?

Look for oil streaks down fork legs before buying Estimated fix cost: $150-$300

What causes Throttle body sync issues, rough idle on the Ktm 990 Duke?

Listen for uneven idle, test both throttle bodies Estimated fix cost: $80-$150

Check charging voltage, look for burnt connector signs Estimated fix cost: $300-$600

Check chain slack, sprocket hook teeth, overall wear Estimated fix cost: $150-$250

Known issues to inspect before buying a used Ktm 990 Duke. What to check and how much repairs cost.

MODERATE

Look for oil streaks down fork legs before buying

Fix cost: $150-$300

MODERATE

Listen for uneven idle, test both throttle bodies

Fix cost: $80-$150

SERIOUS

Check charging voltage, look for burnt connector signs

Fix cost: $300-$600

MINOR

Check chain slack, sprocket hook teeth, overall wear

Fix cost: $150-$250

☐Check service history, especially valve clearances done

☐Test ride cold start, listen for top-end noise

☐Inspect frame for crash damage or welds

☐Verify charging system with multimeter at idle

Solid engine, electrical and suspension need attention