I've got a 2003 250XS , that I bought used last fall, I've had no issues with it. I was just looking to do some preventive maintence on it ,I was going to change the plugs, So, I order a set of IZFR6J NGK's based of the info at the top of this page, however when I took out the old plugs that were in it, I found them to be NGK # PZFR6H .I'm now confused what plug does this beast run on . Your input needed, These plugs are huge money almost $15 apiece and I really don't want to make a mistake and have to by another set right away, Let me know what ones I need . THANKS!!