Guy's, I don't think that it is overheating as I have run this engine many times in the past without this problem.
I am running a side exhaust tongue muffler, plus when flying I bring it back to the takeoff point and the engine still has plenty compression I re fuel and re start right away and make another flight. It re starts easily needles well and again about half way through it goes richer again.
I'm thinking that if I had a leak in tubing anywhere it would go lean. I was getting rust in the filter on the other tank so I installed a new one.
I was having the rich syndrom with the other tank as well.
As for the tach settings it is running between 10 Thou and 10,300 each start. I am gonna change plugs and stay with T'bolt long w/idle bar as that is what I've been using for some time in all my engines.
I sure do thank ya'll for your suggestions, and hopefully we'll get it ironed out.
As for the tank behind the engine it is about 1/2" from the back plate, and when I turn it up it doesn't go hard lean and comes right back when it's level, so that also tell's me that it isn't over heating