MZ/MuZ Riders

hello heres one for you , rebuilt engine runs but the gearbox oil spurts out the filler cap rubber , i put 600cc in so should be ok but it keeps spurting it out what the hell could it be .

it has all new seals bearings gaskets but does this i must have done something wrong lol but what i have no clue any help cheers.

not a 2 smoker fan but sounds like a crancase seal is in backwards

ahh maybe you are correct sir i thank you i will check tomorrow and find out and many thanks. ill let you know.

My ETZ 125 did exactly the same thing - so I just put less oil in and it runs fine and has been doing for years.