+1 robertgary, for stock air filters
also, some details as to any modifications have been done, or expect to be done is needed..
example would be is it ear shaved (removing the air box and stock filters and using pod filters instead)? different exhaust? different Jets in carbs?
I bring that up, because one of the causes of your symptoms may be a result of an ear shave.. regarding the carb vent hose. it needs to be in dead air (up under tank on a frame rail is good, as is plugged into the plastic cover for the fuel sender)