Well, I suspect that you could give your brother a legalized (notarized) letter giving him permission to cross the border from at least the US to Mexico. Make sure you fully reference the bike's VIN, dates of travel and use the names listed in your and his passports and have them notarized.. Put copies of both passports with the letter and I don't think you'll have any problems. This isn't unlike taking a financed bike into Mexico where a letter from the lienholder may be necessary.
If you want to be absolutely certain, transfer the title to your brother for the duration of the trip.
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Gerry
PHX AZ USA
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