Been reading a number of old posts on the WR450 "Bog." There seems to be some difference of opinion on the best way to prevent it -- but those using the 2 types of Boyesen accelerator pump covers (Quick Shot 2 and 3) seem to like them and generally agree that they cure the bogging that occurs when the throttle is opened quickly. I've not put much time on my 2003, but during a test ride in a driving snowstorm today, the bike bogged badly when the throttle was snapped open.
I'm not convinced the Boyesen covers are the ultimate solution, but I like the idea of an adjustable leak jet -- like the one on the QS 3.
Any testimonials as to how useful that feature might be -- or would you suggest I forget about the QS and look for some other cure (tying the pump lever to the spring, etc)? The Boyesen covers are pricey - but smoother throttle response is something you don't want to compromise on.