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when you sit on the bike, you should be able to touch the ground with your toes.
the 150 became its a small bike with lots of power
Honda xr/crf 100 would be better.
CRF is just a label used by Honda in classifing the type of bike. for example Honda has lots of crf's. 50, 70, 80, 100, 150, 230, 250, 450.
Its not a matter of age so much as a matter of size and ability. If the bike fits you go for it no matter what your age is.
dirt bike motor
You can use a smaller chain sprocket to get more top end but at the expense of loosing a little bottom end.
the Honda 150rd of couse but if you want a trail get a Honda 150f.
honda crf 150 f. they make two the 150 f and the 150 r the r is very fast and is not a good first motorcycle for anyone but the 150f is a very mellow fun bike
I own a 1978 Honda Express and I weigh 145lbs. Mine tops out at 28mph. Every bike is different, and it also depends on how clean your carb is.
honda crf 80 is what i used i m 13 and am riding 150 in the super mini class