What causes Fuel system vapor lock or rough idle on the Triumph Bonneville T120?

Cold start behavior, idle smoothness, fuel pump recall status Estimated fix cost: $50-$200

What causes Cam chain tensioner noise at startup on the Triumph Bonneville T120?

Rattling on cold start, disappears when warm Estimated fix cost: $150-$400

Uneven braking, dragging, inspect caliper pistons visually Estimated fix cost: $200-$600

Check all warning lights, connectivity, software update history Estimated fix cost: $0-$300

Known issues to inspect before buying a used Triumph Bonneville T120. What to check and how much repairs cost.

MODERATE

Cold start behavior, idle smoothness, fuel pump recall status

Fix cost: $50-$200

MODERATE

Rattling on cold start, disappears when warm

Fix cost: $150-$400

SERIOUS

Uneven braking, dragging, inspect caliper pistons visually

Fix cost: $200-$600

MINOR

Check all warning lights, connectivity, software update history

Fix cost: $0-$300

☐Verify all Triumph recall work completed

☐Test ride cold start for chain rattle

☐Check service history and oil change intervals

☐Inspect for corrosion on brake calipers and exhaust

Generally solid, minor issues manageable with maintenance