Hi Kitchi - No sorry I haven't explained very well, what I meant by fouled was, the filters are blocking some holes on the inside of the carb I am assuming, my mechanic guy has the bike a the moment & this is what he has said. I am going round tonight to see for myself, as I have never seen a "Sleeve" on the carb with the cone filter attached to that, all photos I've seen the cone filter bolts directly on to the carb with a B/Clamp.