05-03-2023, 07:53 PM
6K miles does seem very early for a pad, mine were barely worn at that mileage but then I am not a city rider. They needn't of changed the air filter, it has a very long life and has a large surface area. It is only to be replaced if "excessively dirty or damaged" otherwise it can just be "blown with compressed air from the outside". Given that they have changed other unnecessary items I can quite imagine they have used whatever oil they had lying around. The spec is 10W-30, it is possible a marginal change in tickover, even by a few revs has introduced the vibration by a different weight oil. There is a balance shaft adjuster on the front right hand side of the engine, ask them if they messed with that at all, set incorrectly and it can introduce vibration. There would be no reason for them to touch it though.