I have the NSR123 and changed the button to turbo button. I took out one shim to make the head clearance 0.014"
If you have a new engine you will need to run it in first before worrying about the carb settings
Go to http://www.ziggy12345.plus.com/Cars/
for all the setup docs for the engine
I cant say anything bad about my NS 3 port. It flys. When the liner wears out you can get a liner, piston, conrod and wrist pin for the NS 5 port for $100 and slot it straight in!!