What causes Oil consumption and leaking from cylinder head on the Ktm Sm 990?

Check oil level, look for residue around head gasket Estimated fix cost: $200-$600

What causes Throttle body sync issues causing rough idle on the Ktm Sm 990?

Idle quality, surging at low RPM, throttle response Estimated fix cost: $100-$300

Inspect welds around subframe, look for cracks visually Estimated fix cost: $500-$1500

Cold start rattle, listen for ticking at idle Estimated fix cost: $300-$800

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

MODERATE

Check oil level, look for residue around head gasket

Fix cost: $200-$600

SERIOUS

Cold start rattle, listen for ticking at idle

Fix cost: $300-$800

MODERATE

Idle quality, surging at low RPM, throttle response

Fix cost: $100-$300

SERIOUS

Inspect welds around subframe, look for cracks visually

Fix cost: $500-$1500

☐Check service history, valve clearances done

☐Cold start the bike, listen carefully

☐Inspect frame welds with flashlight

☐Test ride, check throttle smoothness throughout range

Decent if maintained, neglected examples get expensive fast