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Old 21st December 2018
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Yep,
That condition is called wet sumping.
It is Very common with our Sportys.

Many people do the same as you did, assume the oil is low and over fill the tank.
The FSM says to run the engine up to operating temp before checking the oil.
That's to allow the scavenger gears to send oil sitting in the bottom of the sump back to the tank before checking the oil level.

But, if you just bought a used bike and not knowing the quantity of oil that's in the system,
As you said, it's best to drain what's there and refill with proper amount.
Of course, when draining cold, you will not get all of the existing oil to drain.
So, it may be better to drain and add the proper amount minus a half quart, run it up to temp and recheck.
Then add some more if needed.

Bet that was a mess.
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