Well it turned out my two .35s were really one .35 and one .29.  The .35 cleaned up very well to the point it is no longer a "Red Head".  Anyway I put it back together last night and fired it up.  It does run but its no barn burner.  The piston/cylinder combo is warn out and the crankshaft has lots of play in the bearing.  I contacted Scott Riese and he suggested I send him the engine for determine what can be done.  With a 10x6 wood Master Airscrew prop it would max out between 10 and 11K with a nice 4 stroke around 8500.  After the run there was little compression, this might get better after a few runs and some varnish starts to build up. 

I put the .29 in the pot last night and it is still cooking.  It was far more gummed up than the .35, in fact I had to let it cook for a couple of hours before I could free the crank shaft from the case.  I will put it together tonight and run it tomorrow.  I will let you all know what the outcome is.  Again thanks to everybody who responded to the original input.
Andy

Andy; Here is the way I fix my McCoy engines and I am not the only one that does this. Remove the piston and mic near the top across the piston. Set the piston on an anvil, and start tapping the dome with a hammer, and keep checking with the mic. Do this very carefully as the pistons are very soft and can crack if you strike it to hard. When the piston is 1 and 1/2 to 2 tho. larger than when you started, stop, and lap the piston back to the cyl. with the finest polishing comp. you can find. Put it on the bench and break it in just as a new engine. When it is broken in you should see a 3/16" to 1/4" band at the top of the piston, that is very shiny. I have done several this way, and all of them are still running very well with good comp. Travel at you own risk.

I think you will find that 29 to be a very stong engine as they have different porting than the 35 and like to run in a wet 2 stroke. It will also run a 2-4 but they do like to run fast. I have one that I put on my overweight Ringmaster, and it flew like a light weight. That was with 5% fuel, and a 10-5 APC prop. Do run at least 25% castor. Sounds like your 29 will be a good one.

Ran the .29 last night after work.  Oh my, it is a keeper.  It would easily blow the drawers off the .35.  Speaking of which it is now in the hands of Scott Riese.  It really does prove you cannot judge a motor by it's appearance.  The .29 looked really bad compared to the .35 but it turned out to be a real find.  Now I need to get some high temp red paint to repaint the head.  The crock pot process complete destroys the red paint on the McCoy engines.  When I hear from Scott I will post an update on the .35.
Andy

Having a soft spot for McCoy engines it a curse <LOL>.  Eddie told me (a number of years ago) about a gentleman that refurbished McCoy engines, but I have long since lost his name and address.  As per Ed, the piston was turned down close to the top and a steel band was installed on the piston.  The piston and cylinder were then lapped for a proper fit and broken in as per the norm.  Does anyone know his name and address?

Later,
Mikey

I have never had a mcoy..only foxes and enyas..how does the 35 stack up?

There was a thread a long time ago about making pistons expand by heating them.  Supposedly, if you do it right, it is enough to give even a very worn engine a second life!

John Wright is a serious advocate of dropping Series 21 gubbins into Red Head bottom ends.  He is Wright45 on SSW, if you want to talk to him.