What causes Fuel tap diaphragm cracks, causes running issues on the Bmw F 650 St?

Rough idle, fuel smell, petcock vacuum operation Estimated fix cost: $20-$60

What causes Front fork seal leaks, common with age on the Bmw F 650 St?

Oil residue on lower fork legs and tire Estimated fix cost: $80-$200

Cold start rattle, listen at top of engine Estimated fix cost: $150-$350

Voltage at idle and rev, check for dim lights Estimated fix cost: $200-$400

Known issues to inspect before buying a used Bmw F 650 St. What to check and how much repairs cost.

SERIOUS

Voltage at idle and rev, check for dim lights

Fix cost: $200-$400

MODERATE

Rough idle, fuel smell, petcock vacuum operation

Fix cost: $20-$60

MODERATE

Oil residue on lower fork legs and tire

Fix cost: $80-$200

SERIOUS

Cold start rattle, listen at top of engine

Fix cost: $150-$350

☐Check charging voltage at 3000 rpm

☐Inspect forks for oil seepage carefully

☐Cold start and listen for top-end rattle

☐Verify service history, belt changes especially

Decent if maintained, electrics are weak spot