Hi, New to the board. First off I have to say that I absolutely love this bike and have an 04 and 05 for my son and I. For the 04 I got one complete year of use July - July for this bike and was quite happy. I never had to adjust anything. That said, the day came when I new it was time. I was prepared for this but.... now comes the heartache. Plan A was switch to KibbleWhite stainless valves and springs which I understand have had good success in the 450's. However, they stopped shipping because of spring problems and have no date for resolution. This is a 250 problem not 450. Plan B. Go with factory parts to keep riding and next time switch. I am planning to replace the piston also. For reference, list $$ on a complete top end from Honda is $400. But to my dismay, SOME OFTHE PARTS ARE ON INDEFINITE BACK ORDER. I called Honda and they told me they have the same info as I have and offered no alternatives or insight to when they would be availaible. I find this completely unacceptable given that Honda knows how often these need to be replaced. Or maybe it's more than they thought given the unavailability. My question. Does anybody have any ideas on options? Kibblewhite is the only one I know of for aftermarket valves. Thanks for the replies in advance.