greetings chooter...
i would not worry about it... i would just check the innards of the swing and figger out if its coming from the gear box or the final drive... then crack that fill hole open on a regular basis to make sure i gotts the proper amount of juice in there...
the bugeye motobrick did that for 60,00 + miles... always a couple spoon fulls of juice in there butts never more...
j o