It's probably for an in-frame cable lock system. There's a plug for capping the port if the security cable isn't installed >> the plug is still available at the dealer.
See battery case diagram >> plug = 92066-1077.
Thanks for rapid feedback. Bike is not here to photograph but I do have the promo poster so have attached photo from that. The short tubular tab is welded to the frame down tube at an angle, it is hollow but no internal thread and has rubber bung in the end.
Maybe he cut it so the frame could be sure to dry out? just guessing. or maybe he just started attacking the problem without thinking. ha ha. I found an old comment of mine about water probably getting inside the frame & someone said that a rotted out bottom frame rail is common, leading to failure of the side stand mount. a crumbled frame there would be a bummer.
Yes, who knows why they did that, but for me if water ingress was a problem, I would find the low spot in the frame and drill a small drain hole that would let water out while I attempted to seal up wherever the water was getting in.
But to each, their own...
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