What causes Oil leaks from pushrod tubes and rocker boxes on the Bsa Gold Star 650?

Look for wet oil staining around cylinder head area Estimated fix cost: $80-$200

What causes Worn or damaged crankshaft main bearings on the Bsa Gold Star 650?

Listen for deep knock at idle, check for play Estimated fix cost: $400-$900

Test all gear changes cold and warm repeatedly Estimated fix cost: $150-$400

Ask seller for parts receipts and supplier names Estimated fix cost: $50-$500

Known issues to inspect before buying a used Bsa Gold Star 650. What to check and how much repairs cost.

MODERATE

Look for wet oil staining around cylinder head area

Fix cost: $80-$200

SERIOUS

Listen for deep knock at idle, check for play

Fix cost: $400-$900

MODERATE

Test all gear changes cold and warm repeatedly

Fix cost: $150-$400

MINOR

Ask seller for parts receipts and supplier names

Fix cost: $50-$500

☐Verify frame and engine numbers match documentation

☐Run engine fully warm, check for smoke

☐Inspect for amateur welding or bodged repairs

☐Confirm parts availability before committing to buy

Manageable if maintained, parts supply now decent