No problem leaving your bike in US for as long as you need to.
Central and South .America is tricky to store your bike for any length of time especially if you need to leave temporarily. Mexico you have a limit of 180 days max.
The fall in Mexico Central America is a nice time to travel down there. Consider traveling down to Panama. In Panama you can store your bike in a bonded warehouse near the airport till your return next season.
Dan
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