Ok, I tried to ask this question a couple of days ago, but I don't think I made it specific enough: For history on the issue, look HERE. I'd like to know if there is any reason you can think of why a YFZ450 (quad) voltage regulator wouldn't work on an '05 WR450. I'm figuring that it might work because they both run a very similar engine with lights and e-start, etc. I do realize that the part numbers are different, but am thinking that charging and lighting demands will be the same. Can anyone shed some light on this for me?