I'm sure if you throttle up slowly you don't get that smoke. The engine just gets more fuel than it knows what to do with when it throttles up quick. My cubs do that too, if they get too much choke or I'm too quick with the throttle. You've got nothing to worry about, your 126 is running like a dream by the looks of your snow thrower vids!
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Ian
Mine: 72 w/ k301, 3 125's, 1 w/ hydro lift, 38,42, & 2 48 decks, 2 42 front blades, QA-36a & QA-42a thrower, tiller, lo-boy 154. Also, LOTS of parts.
family's:2 105's, 2 106's, 149, 2 lo-boy 154s, Farmall Cub.
Non-IH: 1940 JD Model A, 1954 JD 40 U, 1955 JD 40 Crawler, 2 1956 JD 420 U's, both w/ Henry Loader and Backhoe. JD 110. Wheel Horse (model unknown.) Power King 1614. We love our tractors! 
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