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.
Yes
max's out at 30km/h
sit down jam it in gear give it gas dump the clutch and htfo
About 75 mph
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60-75 mph
Around 150km/h
Yamaha Raptor 125 has a top speed around 45mph.
50-55
about 100 mph