So I have a 2005 WR 450, and while on the hunt for more power I found a 2004 YZ450 Complete Cylinder Head. Now I know this will bolt right up to my 2005 WR 450, but will the e-start still function normally? I've heard stories about when people swapped YZ cams into their WR, the bike wouldn't e-start very good. I was just wondering if anyone has done this mod to their bike and if so, was the performance worth the cost, and did your e-start work? Thanks!