If you have a Harley and you're running a CV Carb and it's back firing through the carb, poor acceleration and has flat spots, there is a gentleman that can fix that and it won't cost you an arm and a leg.The work he does is flawless, I highly recommend him, his ebay ID is Barber883.You can do a search on ebay for Harley CV Carb and his finished CV Carb's will come up.You can bid on a CV Carb (as I did) and send it to him, or purchase one of his that has been tweaked.Either way you cannot go wrong