It doesnt reall matter how old you are it depends on how tall and how expierienced you are. Id say you should be around 5ft 6"and up to be able to even tip toe on one. A kx125 has quite a bit of power with an explosive powerband. some people even flip them over if they dont know how to ride them.
Kawasaki KX125 can be purchased from a local motorcycle store. One can also find and purchase the Kawasaki KX125 from sites like Craigslist or Kijiji as well.
2 stroke
My 2012 125 does about 80
The Kawasaki Kx125 is a model of Kawasaki motorcycles. It has a six gear transmission and a single cylinder, 40 horsepower engine.
The top speed for a Kawasaki KX125 is about 70 miles per hour. That would be the speed with a 150 pound rider.
32 to 1 32 to 1
According to Bikez Motorcycle Encyclopaedia, 41 HP.
1998 kx125 jkakxrk16sa006455
I run mine at 33:1 it runs fine on that
165, if you run boyesen reeds its 160-162
I have a 1992 KX125 (J1) and it came with blue forks, I think the 93 (J2) did also.
i dont know for all years, but on my 2004 kx125 its 100/90-19