I can do some simple mechanical work but recently got my carbs cleaned. I also added cone filters on the carbs. The mechanic tells me it's running lean and I should add tape to the cone filters. I take the bike for a spin and when I get of the throttle the bike starts reving like crazy. So I add tape. Still doing it. I add more. Still doing it. I have about a centimeter left open and it's still doing it. Can something else be wrong with the bike or is it still taking to much air?