What causes Throttle body sync causes rough idle on the Yamaha Fz1?

Idle quality, surging at low RPM, smoothness Estimated fix cost: $100-$200

What causes Stator failure kills charging system on the Yamaha Fz1?

Battery voltage at idle, dim lights, dead starts Estimated fix cost: $200-$400

Oil streaks on fork tubes, soft front end Estimated fix cost: $150-$300

Metallic rattle first 10 seconds after cold start Estimated fix cost: $100-$250

Known issues to inspect before buying a used Yamaha Fz1. What to check and how much repairs cost.

MODERATE

Idle quality, surging at low RPM, smoothness

Fix cost: $100-$200

SERIOUS

Battery voltage at idle, dim lights, dead starts

Fix cost: $200-$400

MODERATE

Oil streaks on fork tubes, soft front end

Fix cost: $150-$300

MODERATE

Metallic rattle first 10 seconds after cold start

Fix cost: $100-$250

☐Check voltage regulator for overheating damage

☐Listen for valve tick needing adjustment

☐Inspect frame for crash damage or welds

☐Verify service history especially valve clearances

Solid engine, electrical gremlins watch carefully