(... Continued)
And after picking/brushing...
And just for completeness... It seems to be trying to show me that the piston is indeed made out of metal... No idea how after all that...
It's running reasonably well now. It was stumbling before, at first only under heavy load (1500W), but today was missing under any condition it found itself in.
It's got 3 major contradictions to itself and everything I've been taught, witnessed, and noted for myself over many years of playing with things that have pistons and plugs:
1. Without a doubt, running a little rich under no/low load, hunting at higher RPM. Usually this would point to a main jet issue, but up until today, it acted lean across the board, and particularly under light/medium loading. Heavy it just stumbled (at least that part is explained by some carbon... no question why it was failing under pressure)
2. The carbon. Lots and lots of carbon. Did I mention carbon? Yet can see the aluminum that makes up the piston crown at TDC...?
3. The plug is coming out with a light gloss of oil, yet with the exception of right after "clean" warm-up and full load, there hasn't been any further blue smoke from it whatsoever, and this is supported as well by the lack of oil odor.
This thing not only defies all the rules, but it's own claims. You see visible manifestation of one of them clear as day... Anybody got any idea what's going on here? LOL
I suspect there's still a little crap in the carb, and maybe the float needs a tweak... and there's likely a little bit of blow by, supported by the late findings in the deal involving the lack of any air filtration whatsoever... since resolved properly but of course any damage is done.
The plug should be replaced, but I'm not going to bother unless it starts turning up dry and relatively foul-free.
Ok, go! LOL
Steve