What causes Stator/charging system failure on the Kawasaki Ninja 400?

Battery voltage at idle, dim lights, random stalling Estimated fix cost: $200-$400

What causes Fork seal leaks from tip-overs on the Kawasaki Ninja 400?

Oil residue on fork tubes below seals Estimated fix cost: $100-$250

Rough idle, hesitation, uneven power delivery Estimated fix cost: $50-$150

Dragging rear brake, uneven pad wear, heat on caliper Estimated fix cost: $80-$200

Known issues to inspect before buying a used Kawasaki Ninja 400. What to check and how much repairs cost.

SERIOUS

Battery voltage at idle, dim lights, random stalling

Fix cost: $200-$400

MODERATE

Oil residue on fork tubes below seals

Fix cost: $100-$250

MINOR

Rough idle, hesitation, uneven power delivery

Fix cost: $50-$150

MODERATE

Dragging rear brake, uneven pad wear, heat on caliper

Fix cost: $80-$200

☐Check for crash damage on fairings and levers

☐Cold start the bike, listen for top-end noise

☐Inspect frame and swingarm for cracks or bends

☐Verify service history and chain condition

Excellent starter bike, very reliable if maintained