i have been doing a lot off reading about the yz400f and yz426 and am deciding i want to get either bike. I am 6'-1" and weigh 140 so i am small. i only ride trails never been on a track. i am looking for a used 400 since i have been hearing their 1st gear is better than the 426 for desert. i am now riding a 99 yz125 and want to know if the weight wouldnt be to bad?