Pulled the plugs out of the 618 for an inspection today and got a fright.
Plugs have a build up of a whitish colour material on them.
Thought I was losing material off the pistons for a second.
Then it dawned on me. Is this lead from avgas. I have run on avgas the last few tanks because I am too lazy to fill my Jerry cans.
Checked the rave valves ,they slide smooth and easy.
Next weekend I will remove the exhaust and have a look at the rings.
Spark plugs are iridium and have done 43 hours. Look like new again after a quick brush.
All 4 plugs were identical so I take it that's a good sign.