First off, when you checked the oil, did you follow the instructions in the owners handbook ? I ask because these bikes have a semi-dry sump, and if the bike has been standing then all the oil empties from the tank into the sump. When the bike is running, the engine pumps the oil up into the oil tank.

Checking the oil catches so many people out.

Next, the drain tube had probably backed up into the air box, and it takes time for cold oil to drain, that's ' probably' why it took a few minutes.

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Never underestimate the power of stupid people in large groups.