Most of this is going to have some bias but I'll offer that I asked that same question to many a cycle gearhead and nearly all agreed it was the Honda Cb 250 twin. That came from mechanics as well. It was just the little engine that was hard to kill.
250cc
mp3 250
YOU WILL HAVE TO INCREASE THE IDLE RPM.
Yes any motor over about 250cc can be turbocharged.
Honda cbr 250 rr
a 250cc
You can buy a 250cc motorcycle wherever you can purchase small motor vehicles, such as ATVs. There are likely specialty shops around your area that might deal in small engine motors that have bikes for sale.
The 2K9 motor is either a 1978 IT250E or a 1978 IT400E depending on if it is a 250cc or 400cc.
Actually HP can only be estimated . he HP depends on a lot of factors about the motor.
No, compare the sound to a chainsaw or an old 250cc Yamaha dirt bike, no comparison
On a exmark lazer z e-series 250 cc motor
16+ 50cc and under. 17+ 125cc. 21+ for a full sized Motor bike with or without a side car. i would say 250cc is 21+ maybe 18+