I mate a fatty kx 65 pipeand a 24mm carb.
Yes the RPM is a real problem,plus the china motor is not designed to support this so enormous increase of power, the cluch is going tu suffer, the crank also, you conna have heat pb ...
but when you decide to go up this kind of project you know that Racing stuff is not for all days ride lol.
For my configuration all days ride I had the same kind of cylinder but in 40mm bore, 17mm carb, jag cdi, it was less vibration, less noise, maximum reliability.
yes the 6mm thick plate mentioned is for between the cylinder and the cases.
Voila I think that kind cylinder for scooters is really better [FONT=Tahoma, Verdana, Arial, Helvetica, sans-serif]
and reliable than Chinese one, I recommend 40mm bore, but I would adore seeing somebody in USA to finalize a 47.6mm big bore hardcore racing version ![/FONT]
lol,
here a picture of the 40mm bore cylinder i use before the MXS cylinder!