1000 cc that i know of
dirt bike motor
100cc the bigger the better
Bigger cc = bigger motor = more power. But also heavier bike.
if u mean a motocross bike a 500
A 111 cc dirt bike will go approximately 40 miles per hour. The exact maximum speed is dependent upon the manufacturer of the dirt bike.
The largest production dirt bike that I am aware of is the BMW 1200.
the kawasaki kx.
how fast does 250cc Orion dirt bike go
a 110 cc dirt bike goes around 40 or 50 up to 60 or 65 mph