What causes Carb sync and jetting issues on the Suzuki Gsr400?

Rough idle, flat spots, uneven throttle response Estimated fix cost: $80-$200

What causes Rectifier/regulator failure on the Suzuki Gsr400?

Battery not charging, flickering lights at high RPM Estimated fix cost: $60-$150

Rattling noise on cold start near engine top Estimated fix cost: $50-$120

Known issues to inspect before buying a used Suzuki Gsr400. What to check and how much repairs cost.

MODERATE

Rough idle, flat spots, uneven throttle response

Fix cost: $80-$200

SERIOUS

Battery not charging, flickering lights at high RPM

Fix cost: $60-$150

MODERATE

Rattling noise on cold start near engine top

Fix cost: $50-$120

☐Check for oil leaks around engine seals

☐Test charging voltage at 3000 RPM

☐Listen for cam chain rattle cold

☐Inspect carb sync and throttle response

Solid older bike, maintenance-dependent, budget for carbs