I have 2 girls (3 yrs and 2 yrs old), and I would like to get them started early riding. I have a 97 Z50 that is in great shape, but I was thinking about buying a newer CRF50. I have never compared the 2 side by side. How do they compare in seat height, weight, etc? I plan on starting them out by riding with me on it, but eventually I would get a set of case mounted training wheels. Thanks.