I own a 2002 WR250F that I thought would have enough power for me but I am 6'3 230lbs and at times I wish I had some more power. I have an oportunity to trade for a 1999 WR400F. I have made one payment on my bike, his is paid for and he wants $3800, he will take over payments on mine.Does this sound like a fair trade. Will I be happy with the extra ponies of the 400? How much more does the 400 weigh?