What causes Stator/charging system failure under hard use on the Kawasaki Ninja Zx-4r?

Check battery voltage at idle and high RPM Estimated fix cost: $300-$600

What causes Throttle body sync issues causing rough idle on the Kawasaki Ninja Zx-4r?

Listen for uneven idle, ask about last service Estimated fix cost: $100-$250

Inspect below engine for coolant staining or residue Estimated fix cost: $150-$350

Known issues to inspect before buying a used Kawasaki Ninja Zx-4r. What to check and how much repairs cost.

SERIOUS

Check battery voltage at idle and high RPM

Fix cost: $300-$600

MODERATE

Listen for uneven idle, ask about last service

Fix cost: $100-$250

MODERATE

Inspect below engine for coolant staining or residue

Fix cost: $150-$350

☐Cold start test, listen for top-end noise

☐Check for track use or crash damage

☐Verify service history and oil change records

☐Test all electronics, dash, and quickshifter function

Generally solid but needs attentive maintenance