Like some others! I don't like spend money unnecessary, hence the reason I change oil and filters myself! One month after I bought the bike, the valve clearances were checked (Not by myself I hasten to add) They were all within spec! If they weren't, then it would have been off to Drysdale's of Perth to get them done! Haven spoken to Drysdale's, they said if there OK at around 18/19k then they'll be ok for 30k +