What causes Gummed carburetors from long storage on the Suzuki Gs 550?

Cold start, idle, sync, fuel overflow at petcock Estimated fix cost: $150-$400

What causes Cam chain and tensioner wear, top-end rattle on the Suzuki Gs 550?

Rattle at idle and off-throttle, valve clearances Estimated fix cost: $300-$800

Look inside tank, feel lever, check fork legs Estimated fix cost: $100-$300

Battery voltage at 3000rpm, should read 14v Estimated fix cost: $120-$350

Known issues to inspect before buying a used Suzuki Gs 550. What to check and how much repairs cost.

MODERATE

Cold start, idle, sync, fuel overflow at petcock

Fix cost: $150-$400

MODERATE

Battery voltage at 3000rpm, should read 14v

Fix cost: $120-$350

SERIOUS

Rattle at idle and off-throttle, valve clearances

Fix cost: $300-$800

MINOR

Look inside tank, feel lever, check fork legs

Fix cost: $100-$300

☐Cold start it yourself, no preheating

☐Check charging voltage with multimeter

☐Verify title, VIN, and mileage records

☐Inspect wiring for hack repairs and corrosion

Tough air-cooled engine, electrics and carbs need attention