What causes Airhead carb diaphragms cracked or leaking on the Bmw R 90 S?

Rough idle, poor throttle response, fuel smell Estimated fix cost: $80-$200

What causes Spline wear on rear drive shaft on the Bmw R 90 S?

Clunking on acceleration, check lube history Estimated fix cost: $300-$600

Oil residue around cylinder head covers Estimated fix cost: $40-$120

Check all fairing mounts and panel condition Estimated fix cost: $200-$1500

Known issues to inspect before buying a used Bmw R 90 S. What to check and how much repairs cost.

MODERATE

Rough idle, poor throttle response, fuel smell

Fix cost: $80-$200

SERIOUS

Clunking on acceleration, check lube history

Fix cost: $300-$600

MINOR

Oil residue around cylinder head covers

Fix cost: $40-$120

MINOR

Check all fairing mounts and panel condition

Fix cost: $200-$1500

☐Confirm splines were greased regularly

☐Test both carbs sync and balance

☐Check frame for cracks near headstock

☐Verify original matching numbers present

Tough, simple engine but needs disciplined maintenance