Pit bike air filter 34 36mm our pit bike air filters are designed to keep the dirt away. With an outer crud catcher and an inner sponge filter you can be sure the dirt won't be getting in easily. Not only this but the quality air filter improves air flow and assists in even running. Easy to clean and long lasting this is a must have for your pit bike. The fitment point of 34 36mm means this air filter is suitable for many 50cc, 70cc, 90cc and some 110cc pit bikes.if you have an 110cc machine you will need either this air filter or the 38mm, so please check your machine. We recommend the use of an air filter oil for off roading to obtain maximum effectiveness. A clean air filter is essential for optimum performance and reliability. Summary34 36mm fitmentfits many 50cc 110ccouter crud catcherinner sponge filter