I've done that for a friend of mine so he could keep his quad...actually I've made his Yamaha payment for him for the past 3 months while he's getting back on his feet. I'd rather do that than lose a long time riding buddy :shrug:
To me, 600 bucks isn't worth selling your quad for, I'd pick up a part time job for a month before selling it. You can make 600 in a week delivering pizzas
But, you do what you gotta do, I might have to sell my 450 in the coming months because I may be layed off at my current job, but that's a little different than your situation.
Good luck to ya :beer: