No such thing as a 5-stroke dirtbike.
Haw fadt is a 65 2 stroke dirt bick
About 85 90 mph
About 75-80 mph.
50mph to 75mph it depends on the condition of bike.
they can go pretty fast. they will beat a Yamaha blaster 200
a 110 cc dirt bike goes around 40 or 50 up to 60 or 65 mph