I asked them about a 2.02" and they said nobody wanted it and it wouldn't sell. They send them out the door with a 2.08" and I am referring too the B.M.'s here. No the larger valve isn't the problem by itself. You have to understand how the bowl, seat and chamber work together to get the full picture of why their "porting" (and I use that term loosely) is just wrong. J.Rob