It's more based on the size of the rider and that person's skill level than age. If both feet can touch the groud, even if it's just a little bit, it's fine. Sag can also be adjusted (reffer to owner's manual) so that the suspension will go down further for smaller/lighter riders. People can also be seen at the races with blocks under their feet at the starting line before the gate drops.
A 2 stroke.
YZ85's are actually an exceptional bike.. but you have to stay on top of the maintenance.
Depends how big you are. Yamaha makes really good bikes. maybe like a ttr125 or ttr225 or yz85 or something.
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A stock Yz85 is capeble 0f 64 mph. With proper upgrades, 70 mph can be achieved.
For trails XR100-XR650.For motocross YZ85-Yz125no that is not. the best is a razor electric dirtbike
50:1 mixture
93-95 octane recommended
dog poo 11
15629. All the level is is nothing but red and orange
Owner's manual(for TTR 125LW (2010) said that recommended pressure is 15 psi.