"Stage 3 means pretty extensive to me. If you have pretty extensive port work, then the smallest I'd go on duals is 30mm. I'd say more like 34mm for pretty extensive port work. For mild/moderate portwork maybe 30's is about right. I think it also depends on personal taste quite a bit. From 30mm to 34mm, I doubt you could go wrong.
Also, I don't remember the portwork, I probably wouldn't have recommend a single 35mm if I knew there was portwork. I'd run a single 35 with very mild porting, but thats it. Any more, and its back to duals."
That is from the thread I posted a few weeks ago asking about whether I should stick with the 35 or go back to duals, and that was your response. In a later post you said 32mm would be perfect for my bike. I am sorry it sounds like I'm just going in circles but I have just been taking your advice. I may end up going back to the 2 into 1 setup..