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check this out: https://www.launchtech.co.uk/support/information/dtc-codes-list/ P0171 must be the fuel system rail as it says “P0171 – Fuel Trim System Lean Bank 1” I couldn’t find 171 in the official hyosung service manual, is that what the dash actually says on the bike ? Consider your injector system, throttle bodies in this matter here. I’m not sure how your mechanic checked that.
here’s a video: https://youtu.be/d5EChYSaCBo
my feelling now is the fuel pump failing