The top speed of the 125 ttr dirt bike is determined by the surface upon which it is being ridden as well as the weight of the person ridding and gear. Ordinarily it can do speeds of up to 85mph on slopes and 55mph on flat terrain.
a stock ttr 125 goes 52 -55
on a basic TTR-125, the top speed should be somewhere around 45-50 MPH
55mph
50-55mph stock
45-55mph
50-55mph stock
top speed 55-60 depends on your weight
Any two stroke 85 is faster than a ttr 125 because it has more torwue and is made for racing. a ttr is a trail bike and not made for speed
NGK CR7-HSA run the best in a ttr 125. Thats what I have in my ttr 125.
150
45 to 50mp
120 mph