how many miles have you already put on the bike?
how many miles is this long trip?
are you gonna be in the middle of nowhere or always near big cities with dealerships etc?
all 3 things would affect my decision. if already have put for example 10,000 miles on the original fuel pump, it's unlikely it'll give you problems with a 1000 mile trip. of course, if you are taking a 20,000 mile trip things may be different. also, the symptoms usually arise a bit before failure (ie, it doesn't fail catastrophically), you'll notice it'll be hard to start at times for example. so if you're always near civilization, there's a good chance you'll be able to catch the symptons in time, drive by the next big yamaha dealer and pick up a new fuel pump. if you are spending 3 weeks alone in the desert, things may be different...