I have gas in the oil in the gear case. I have the case pulled apart . I have the clutch basket off and the gear that sits on the crank . From what i have read I beleive the seal is leaking.. I rebuilt the engine complete bottom and top and think I may have used the wrong crank seal. The one that was in there was the same on both side just a rubber lip. I think the one that should have went in there was flat on the front almost like a bearing seal would be.