Brain, I understand you are new to this all. I have seen ALL the questions you post. may I suggest you go to casper and spend sometime with kevin. I met him this last jan. he is a class act, and seems to be a very nice guy. (plus he has an awesome shop) the best thing that has happened for me over the years is being around some of these guys that have been there and done that. I learned long ago that the BV is NOT an idle mixture screw. as you now see.