On the underside of the primary all the way to the rear of the primary just under the clutch area is a pipe plug. Remove the plug to drain the oil. To refill the primary, remove the round derby cover from the primary over the clutch. Stand the bike straight up and fill the primary with 20W50 engine oil until the level just comes to the bottom of the clutch drum. Do not overfill or the clutch will drag.
Good Luck
Steve
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