la sleeve kit can make tremendous power for its size , i like to build mine with a custom spacer plate (not the ones vitos gives) dont let anyone tell you that running a spacer is wrong or a dumb idea *but it must be setup a certain way and ported correctly thats where an engine builder comes in ,this bike runs a 240 kit with a 3mm crank and the dreaded evil spacer plate
YouTube - bbdr states race win
if it didnt work it would not run 82 mph in 6.7 seconds in 500 feet @244cc on gas