jonnyg

At guess this is a klean air system which puts clean air into a hot exhaust to help continue burning any unburnt fuel left after combustion. not a restrictor not a dump valve for excess inlet pressure just a way of getting it through emissions

I cannot believe I've sat and read through this , yes its been disapointing,yes it could have been handle better. but for gods sake get over it, an engine knock can be difficult to diagnose, do you completely strip an engine and measure every single part? this would be ideal if someone is paying for it. from what I've read the dealer found a problem with the head Ureaka! new head fitted start bike noise still there, Bummer strip motor find crank is stuffed,order new crank and associated parts rebuild when they arrive. if the dealer stripped the complete engine measure all the parts and found just the head was at fault, they can only claim for the head repair, down about 16 hours at a reduced rate. Yamaha will only cover your cost you cannot make a profit from them on warranty repairs as you didnot by your bike from them and then got aggressive quoting trading standards I can understand why they stopped the repair Sorry if this isn't what you want hear