Since your 400 runs fine once started and warmed it suggests a couple possibilities:
1 - The choke plate is not shutting tightly. To check set the choke knob to full, remove the air inlet tube at the carb and peek at the top or bottom the plate, adjust as required so it closes tightly.
2 - New, emissions reformulated (ie crappy) gas. The ethanol, etc. in this stuff makes it less volatile. This in turn makes cold starting (of carbureted engines anyway...) more difficult - especially as the temperature drops. About all you can do there is try another brand of gas, or else simply live with it.
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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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