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G'day. A ticking noise from the valve cover could be a loose cam chain or a loose valve clearance.Since the YZF's have under bucket shims to adjust the valve clearances, you have little choice other than to have them checked/adjusted at your local bike shop/dealer. To locate and narrow down noises I use a neat automotive stethascope I got from my local tool shop for $25.A screwdriver placed against your ear & touched to the cover in several places may help you narrow down if its the cam chain or the valve clearance. Sorry I cannot be more helpfull(this is not to say that I do not know how to adjust under bucket valves as I do.It takes specialised equipment & knowledge to undertake this task). Kind regards Andrew Porrelli
Sounds like you have blocked or partially blocked pilot jets, this can happen if bike has been sitting anf fuel has gone stale in bowls or contaminated fuel in tank. hopefully bike if well serviced or could be caused by air leaks or even tight inlet valve clearance if bike has done a lot of miles
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