50 to 60 mph. Depends on your weight. You can gear it taller (bigger front sprocket, smaller rear) and do some motor mods but its only a 125cc old style 4 stroke, the most you could do is probably low 70's.
max's out at 30km/h
No. The Yamaha YBR 125 has a four-stroke engine.
no
yes
yz 85 cus its 2 stroke but if u modify the 125 enough the 125 is faster ya dinconpoop the ttr 125 is faster
Yamaha TTR 125
About 75 mph
a yz250 is two stroke and a yz250f is four stroke. same with the 125 and 85
50 to 60 mph. Depends on your weight. You can gear it taller (bigger front sprocket, smaller rear) and do some motor mods but its only a 125cc old style 4 stroke, the most you could do is probably low 70's.
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60-75 mph
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