Back to the dock for a check and found two surprises. Firstly the fuel cork was not a cork at all, but perhaps some type of decomposed silicone. Like thick jelly, probably decomposed by fuel over the years, I always wonder who makes these sorts of repairs! I had fully stripped this motor last year and I always check the taps, so I must have simply put back on the wrong tap. Easy fix with a new cork but thought the forum may like to see another failed fix.
This time it ran amazingly well. No issues for 90 minutes of running. It idles at perhaps the lowest I have ever seen a gull manage, and the full throttle range is smooth. No smoke whatsoever. Water coming out was so cool I felt the cylinder about an hour into running, it was warm to the touch but not hot, which always amazes me. Pushed the family of 4 in a punt effortlessly the whole time.
So onto my question. I’m sure this has been covered plenty, but the search feature is a bit tricky on the forum. Below is a pic of the spark plug, which was a new champion d16 properly gapped and run for about 90 minutes. Can anyone give feedback on the plug condition or point me to a thread that can?
