We run a 3.5 class at kam kartway. Nice wide dirt oval with good banking about 500ft round. We run a 11t 67t. My son runs the top and keeps his foot in it. We are going to waco next week which has longer straights and flat tight corners. Its 560ft round. Should i change my gearing. If so what should i change it to. When we get there i adjust the chassis to his likeing for the tight corners. Also, what is the best way to clean these drum style clutches? Wipe out with WD 40?