Sorry to hear about your luck, but your dealer should of told you before hand that Honda wouldn't cover this. I know this is kind of stupid, these stems are pretty weak, but you have to look at it from Honda's standpoint. Unless they hear a ton of problems with the stems just failing from material issues on not from mistreatment or rollovers, then they are not going to feel obligated. I personally would talk to your shop after you call honda and explain to them even though they wont care, but talk to the shop and tell them you specifically said you wanted aftermarket if honda wasnt going to cover it so you wont pay a red cent due to them being incompetent, and maybe you can make out a deal, to pay half or something. They probably wont go for it though. Crappy situation. But warrantly claims usually only work for things that Honda can CLEARLY see was a manufacturers defect or something of the sort.
2008 700xx; Power Bomb header with power core 4 exhaust, Power Programmer III, pro armor nerfs, prm products control front and rear bumpers and full skid, 10" ITP rears, ITP Baja's fronts, RZR 2's all the way around, Uni filter, 13t sprocket, CCP steering Damper, DS450 shock swap, Dual Gasser Throttle, bar risers and Moose barkBusters. 730XX kit plus other engine mods!