get your motor warmed up, shut down, put a pan under it, unscrew oild drain plug on bottom of the motor, stand it up on its assend if it's too tight, to get at it easier, get it loose, drain all oil, and refill with any 2 stroke trans oil, i'm using the honda stuff now, but have used bel ray gearsaver in the past, fill with the amount written beside your oil fill cap, near your kicker
.6 sumthin liters, i think, or to the top line in the window, run it a little and check again, add if needed