ok ive owned my 1998 zx6r for 3 months now.i noticed a slight cam chain rattle when i bought the bike but that was the only thing wrong with it.now 5000 miles later its at 40k and never had any valve service done.my question is how much does it usaully cost to have valves adjusted cam chain and tensioner replaced and prolly plugs oil change n all that while im there.i know all places charge diff im just lookin for an close estimate i almost went broke buyin my first bike and i want it to last a long time.thx for any help