The breather box is bolted to the side of the block with a ¼"-20 UNC bolt.
Use a 7/16" wrench to take it off. The bolt is dead bottom so you can't see
it.
Your exhaust will be wet and misty until your exhaust system is ALL above
212°F because the exhaust contains water vapor as a combustion product and
it condenses on the cold exhaust piping.
How are your carbs? Could the venturi piston in one be sticking in the
raised position? Are the throttle shafts good and tight in the carbs or
do they rattle?
Most of the matters with the 122 are simple but some are counterintuitive.
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George Downs Bartlesville, Heart of the USA!