For those of you that have a Kaw air-cooled engine, you might be able to "upgrade" your oil system as I did.
Most of us that have an air-cooled Kaw on our equipment (Scag, JD, ExMark, etc) probably have an "FH" series engine. Available in 19, 21, 23 and 25hp, only the "721" (25hp) model...