What causes Stator/charging system failure on the Ktm Rc 390?

Battery voltage at idle, flickering lights, dead battery symptoms Estimated fix cost: $300-$600

What causes Coolant leak from water pump on the Ktm Rc 390?

Inspect weep hole under pump for dried coolant residue Estimated fix cost: $150-$300

Rough idle, hesitation, surging at low RPMs Estimated fix cost: $100-$250

Inspect welds around headstock and swingarm pivot closely Estimated fix cost: $500-$1500

Known issues to inspect before buying a used Ktm Rc 390. What to check and how much repairs cost.

SERIOUS

Battery voltage at idle, flickering lights, dead battery symptoms

Fix cost: $300-$600

MODERATE

Inspect weep hole under pump for dried coolant residue

Fix cost: $150-$300

MODERATE

Rough idle, hesitation, surging at low RPMs

Fix cost: $100-$250

SERIOUS

Inspect welds around headstock and swingarm pivot closely

Fix cost: $500-$1500

☐Check service history and oil change intervals

☐Test ride for throttle smoothness and idle quality

☐Inspect frame welds with flashlight carefully

☐Verify charging voltage with multimeter at idle

Decent but maintenance-sensitive, avoid neglected examples