The numbers on the carb are 197A and then there is a 204. There is a rotation hub of insulated material between the carb and engine. Prop used yesterday was a Zinger 16x6 and when the TCraft went dead stick it was an APC 16x6. From my experience a 16x6 is generally about equivalent to a 15x8 and it simply depends on the general speed of the plane which is chosen with a faster plane enjoying the 15x8 and a slower like the TCraft a 16x6.

The engine is magneto and I think the timing therefore fixed.

The motor was plenty warm when trying to adjust the high speed but it would not adjust rich enough to stay cool. As outlined, the high speed adjustment just didn't do a lot in the way of richening the mixture.

I picked up a carb kit and will report the results.

You got me thinking however, and I think I mis spoke about the rpms after the rebuild. That was many months ago and my memory isn't what it used to be. Looking at my notes, I ran it on the bench after rebuilding the carb and it ran 8650 on an APC 16x8. After installing in the TCraft I went with an APC 16x6 and touched up the high end with cowl on and got 9300 and backed off to 9100 thinking the G-23 only very slightly stronger than a G-20 that runs 8900 consistently with an APC 16x6. I quoted in my post 1,000 less than was the results after the rebuild evidently because that is what I was reading with yesterdays test.

That might explain yesterday's heating issue, as there may never have been adequate fuel to develop full rpms though it could be other issues like a slightly bent crank or what not.

Last, an inspection of the acetate pump shows that the pump diaphragm area is significantly distorted (bubbled) in the direction of the outside plate. I don't know what that means. It might be that negative crank pressure is greater than positive or that when hot the diaphragm decided to swell and just happened to go that way... who knows? I can hold it in my hand and using thumb to depress the bubble actually hear the acetate pop across much the way one played with a childhood clicker toy. I wonder if positive crank pressure was enough to punch the bubble across in order to pump effectively... I've some doubts.... again, we will see what takes place after rebuilding using rubber.

The pump had no more than twenty five minutes of run time.