Parts 29 and 30 is below the breather. The cover and gasket is diamond shape and it covers the hole for a fuel pump which not used on this engine for the 125.
As for the breather, most of what I know for it smoking is blow-by and sometimes running too hot. I've also heard a bad head gasket can create this issue. Other people will chime in, I'm sure.
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Two 125's and a 124 all with 42" decks
Plow blade
#2 Cart
QA36 snowthower
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