You cannot refresh the crancase. Keep clean, relatively light, oil, and clean air filter.Thanks for the info. So just the crankcase is sealed? Is there a process for refreshing it?
I change oil after every actual race (10 laps or more on the track), and change air filter, or at least turn it 180 degrees.
You CAN regrind the valves, and seats. This is where much attention should be focused with the 206.