mucky, your right about the night riding... but your wrong about a rm125 not having enough power... For one a lot of 125's can smoke the 250's pretty easily. You would be suprised with the power of most 125 2 strokes.

 

true but since he's 15 and you know how teenagers are they ride for a while then they need more power
I have a KX250 that will do 90+ and it scares the hell out of me everytime I ride it
I've never rode a 125 before and I bet they are nice seen lots of them
the only thing i've ever raced was my buddy and I lose everytime
he has a KX500. I would rather ride my quad .but thats just my opinion
he might like a 125 a be happy with it