There should be a breather on the top of the casting right above the rear end cover...its a round porous area a little smaller diameter than a dime(not sure what the material is exactly, but looks like stone)....pretty sure all the hydros have this, my 127, and 682 do. Its possible its been painted over, or just full of crap and clogged...
Someone correct me if all the earlier hydros weren't vented...
Jeff (teet)
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CCC 1211
71
127 
102
122
1962 Original
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