Will I be able to ride A Yamaha Yz 125?

absolutely. and if you cant (unlikely) then just adjust the suspension so that it sags when you sit on the bike. Well, as for other bikes, when i was 5'5 my dad bought me a wr450. sounds silly, but i've grown into it, just had to take it easy for a bit. its a great bike with lots of grunt. trust me, if the yz 125 is your first bike, you will get bored of it very easily :(. the wr is like driving a v8, just cos the powers there, dosnt mean you have to use it. go for something bigger.
 
if your ready to handle a bike with that much power then yea, and even if its to short you can always lower it. That bike is not built for top speed so mabye only around 60 if its stock, but you can add a pipe, silencer, reeds, and change the gearing to get maximum top speed if thats what your looking for.
 
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