Hi,Can any body tell me what what the difference is with the Canadian WR250's as apposed to the USA spec'd models I've just purchased the Canadian model here in New Zealand & have just run it in & now want to do the free mods to make it run better as in stock form its a slug So can the grey wire mod/airbox mod/ Exhaust (I've pulled the exhaust baffle already)/ throttle stop/ etc be done to the Canadian models?? Also what is the main jet stepping range on the 04 WRF's... If a went up one step on the main after doing the airbox mod would the step be 178 to a 180?? I DON'T want the YZF cam timing... Will the grey wire mod still work OK?? Do I have to do the Throttle stop mod with the grey wire mod?? Thanks for any help with my questions.