I'd say the kx 125
Matters of opinion have easily-dissolved answers.
gas
kx 125 is better because KTM 125 or any ktm snap so go with kx 125
The dirty, rusty trails on the train track were to damaged for the train.
about 65 to 70
Trail: For the trail it will help you find your way and to know that its a safe trail and other people been on it. No Trail: It helps you see things that you never seen before but you might get lost because maybe its not a trail because its dangerous Trail: good thing is you can find your way better. bad thing is when its foggy you can't see much. Non-Trail: sometimes you wont find your way unless you know it well. a good thing is when its foggy you can see better in the trees!
32:1 is the standard oil mixture on the kx125 a little more oil is way better then too little!
The top speed for a Kawasaki KX125 is about 70 miles per hour. That would be the speed with a 150 pound rider.
65-75
KX125 bike can be bought in vehicle stores, such as Velo Street. It may be available in a local bike shop that does not have a globally famous worldwide link.
With stock gearing around 65 mph