A 300cc crotch rocket type will blow the scooter away, no ifs, ands or buts about it. That is not what these bikes are about. They are a compromise but a pretty good one..................
300 cc motorcycle will have roughly the same performance like 300 cc scooter. One should account for factors like transmission ratio and final drive difference, weight difference and slightly higher loss in CVT transmission compared to sequential gearbox in motorcycles. OTOH, 300 cc motorcycle will need at least one, maybe two gear shifts to reach 100 km/h while scooter will need none.
There is nothing magical about "crotch rocket type", compared to scooter. It is all about engine power, transmission ratios and mentioned factors.
Regarding acceleration, 0-100 km/h of 250-300 cc scooter (Downtown does 0-100 km/h in 11 sec), or motorcycle, for that matter, can be compared to 0-100 km/h acceleration of 1.4-1.6/100-120 hp naturally aspirated sedan car like VW Golf. It is more than adequate for most city driving purposes, but if you had 1000 cc bikes in the past, I would not exactly call it lightning fast, so don't expect too much. If you are looking for thrills, you should skip scooters altogether (except maybe Gilera GP800) and everything below at least 80 hp, and all that if you are a novice rider, which, it seems, you are not. But you already know that.
