@Calum Crap! I already did the modifications on the inlet manifold. I hope i didn't mess up my bike.
@Darty Thanks for your explanation! I will stop 'abusing' the reed valve stopper. I ordered the Boyesen dual stage reed valves so I wont need the stopper anymore. But like i said to Calum, I already did the modifications to the inlet manifold. Maybe I was a bit naif.
But I have read on 'scrimsmustangs' (when it was still online) that one of the restrictions on the 2001 bike is that 'square rubber nose' and that you had to cut off the whole part. So cutting away some parts seemed not so drastic as removing the whole part.
T