Hi you should not worry, if your gearbox had no oil then it would never survive 1600km. I think you are safe. But always better to be safe then sorry so you should go asap to the workshop.

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XTX 2011. Yamaha Hand Guards, Akrapovic slipon mufflers, Snorkel removed, Airbox drilled, AIS Blocked, PCV, Dynojet Autotune, Kev O2 Controller, Dna Stage 2, KN air filter, mini indicators, steel sprocket cover, cnc levers, cnc mirrors.