It could be a leak at the oil pump as it is mounted down near the bottom of the recoil. Check all the hose connections and any gaskets/seals.
Another possibility is if you had your oil reservoir topped right up for the summer it may have expanded and leaked out through the overflow. That happened to my 550 this past summer. It's the first time I've ever topped up the tank before summer storage and now it will be the last. Makes a mess in the belly pan and all over the floor.
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