2019 SER 300 Factory jetting

[bandicoot]

nice plug, but why is so black outside on thread?

My bike after re-jetting and with 50:1 mix still gets spooge, a lot actually.
I guess I try again 60:1 now.

If its got a lot of spooge maybe look at the flashpoint of the oil your using
Try a lower flashpoint oil so the engine hasnt got a huge amount of unburnt oil floating through the exhaust