This 3" X 4" filter with a 1 1/8" opening fits the Animal and all the OEM 206 CC carbs. It has been used since the first Briggs OHV engines were introduced. However, It is not legal for us at many tracks and events. As with any kart racing engine it is highly recommended to apray it with a good name brand filter oil and for sdditional protection add a nylon Outerwears pre filter.