Hi Mate, Put the stainless inlets in from a TRX, they use the same springs, retainers, collets etc. If you've done a few KM's check your valve spring height. You should'nt be having any problems with the exhaust valves. I've had the TRX inlet valves in my bike ( CRF450R ) that I use for trail riding and motarding for over 3,000 km now and have only reshimmed it once. Hope this helps, Cheers.