i would not finance a bike
those 90 day same as cash and "no payments for a year" are not good deals. with most of them you either have to pay off the entire amount in a short time (90 days, 1 year)...or you will pay a high interest rate (20-30%) retroactive to the time of purchase. same holds true if you are late on a payment.
i hate it when i sound like my grandfather...but this is one thing he was right about.