Okay. The change to my bike is indicated by the subject of this topic .. you have the rear belt drive, 2 pulleys - 1 on either end, 1 on the rear wheel and 1 on the gearbox shaft behind the clutch. Its the latter that has been changed from the standard 32T to a 34T.
So with a bigger belt pulley:
1) the belt adjust would have been bought back towards the gearbox.
2) top end speed would have been sacrificed as the gearing up would have diminished the power at the rear wheel.
No I have not had it dynoed since changing the pulley and yes this is why I have started the tuning an EFI topic up.
Hope this is now clear
Roy