probably the aprillia rs250. its a two stroke engine and is capable of exceeding 140mph
it will go 650 mphs
Dirt Bike or Street? Dirt Bike 250cc will be okay if you are beginner. It really goes by skill level. 4-Stroke motocross bike 250cc will be plenty. You will be able to jump everything. Street, you will outgrow it very quickly.
the best dirt bike would be a 250cc 2 stroke
Dodge Tomahawk (Worlds Fastest Bike) 8.3L V10 engine producing 500HP! A Very Very Fast Bike.
Kawasaki ZX14
RX 2-stroke
No, compare the sound to a chainsaw or an old 250cc Yamaha dirt bike, no comparison
suzuki hayabusa
Yamaha TTR 125
None, they all suck.
Depending on the type of 250cc engine, two-stroke or four-stroke, and the state of tune of the engine you can expect anywhere between 20hp for a nice relaxed trail bike to over 40 hp from a fire breathing two-stroke motocrosser.