If that is all the fuel you have, try to find something that is a mix of castor and synthetic. If the 22% lube fuel you have is at least 1/3 castor, that should run well enough for a bench run. For ringed engines, a little more castor is usually desirable, but if this engine has been run in sufficiently and can be considered broken in, it should run on the fuel you use in your OS engines. Cool power is all synthetic and I don't know if you can add castor to it. If the local hobby shop has the pink Omega, you can add about 6 ounces of castor to that and be in the ball park. For an engine with the Dykes type ring, you need the oil to help let the ring work.  As far as the engine quitting, I would suspect the plug, especially if the fuel you have runs well in other engines. When you get this sorted out and the K&B running well, you might want to use some after run oil to keep the bearings from gumming up from the castor oil in the fuel. Some commercially available stuff, or even just transmission fluid if you have an open bottle. Air tool lubrication oil works well also.
   Type at you later,
     Dan McEntee

Fuel would be 10% nitro 1/2 &1/2 synthetic/castor works great in any ringed engine. Plug could be a K&B RC long with idle bar. Sonictronics also has a good RC idle bar plug. 

The problem might be that it's just plain worn out or the ring could be all gummy. What ever you do don't take it apart until you're sure it needs a rebuild. Does it have a "P" stamped on the head? That's the low compression head for stunt but won't help your flame out problem. Try a new plug and some fresh fuel before you judge it.


Motorman

Nope, not the hemi head.  Don't know it's origins.  I suspected the plug but it did light and I was eventually able to get it started.  Photo of engine.  Don't think I've seen this venturi style before.  Anyone recognize it?

   Where are you located Steve? That venturi looks like the ones offered by the late Russ Gifford, who lived up in Iowa. Russ used K&B engines a lot. The last big stunter I remember him flying used the last version of the K&B .61 with the twist head to vary compression. I have a few of those venturis and they work well and look cool! Ask around and see if anyone has any Fox fuel with oil up in the 25% range just to try. The extra oil will help with compression enough to maybe let it run a bit. IS it starts at all I would think it should run. Try a good hot plug, like a Thunderbolt of GlowDevil R/C long. I remember the local R/C guys having to use starters on these even when brand new. MECCOA should have rings for it if you want to try changing the ring, but get good reliable specs for the gap and such. I have a few of these in the different versions, including the last one that was an ABC piston and liner, but have not had a use for them yet. The late Jim Thomerson was another one who used these a lot. Jim lived here in the St. Louis area, but moved back home to Austin, Texas when he retired from teaching and research at SIU in Edwardsville, IL. he passed away several years ago, but maybe it's one of his old engines if you live down that way.
   Type at you later,
  Dan McEntee

    We are having a real problem finding fuel here in St. Louis, and in anticipating that someday I may have this problem, I always bought some fuel whenever I went to SIG for their C/L contest, or to Montezuma for any reason. I had quite a big stash, and some of it was stuff from 2012 or older. Like a lot of people, I have some that was of questionable quality and on the 'weed killer" shelf. Just to be able to sport fly, I have been going through everything I have to see what runs and what won't and using it in my fun flying airplanes. I have not had any problems so far  and I have burned through quite a bit of it and some I know had to be 20 years old or so. I have opened up 40 year old cans of Cox fuel before and had it run just fine in Cox engines. If it's been stored in a stable atmosphere and out of the sunlight, it ought  to run, and the thing to do is try it in a couple of different engines and plugs. If it won't run in anything, then it really is weed killer! I had some Fox brand fuel stashed also, so you know how old that must be!. Two gallons of a 22% total oil, half and half mix that I got in some stuff I bought. It almost looked like straight Klotz oil! I have had plenty of SIG fuel to run over the years so just let it sit. I went through my entire stock last week and sorted things out and found some Fox Dukes Fuel, which was 10% nitro and 20% all castor. I had two gallons of each, so mixed up a gallon using half a gallon of each, and I'l be damned if it doesn't run pretty nice. Comparing it to a gallon of the freshest SIG Champion I have and it runs about the same. So I'm using it to fun fly and saving the good stuff for any contest work, but not much of that in my future. So once you get some reliable electric igniter systems working and some other plugs to try, might as well try some of your other fuel. You might be surprise what will still operate. it won't be Gold Bond Certified, but good enough for testing. Good luck with it.
    Type at you later,
     Dan McEntee

Yeah, I'm up in MN.   As mentioned, the engine will start and runs fine - until I remove the battery.  In fact, I set it for a rich 2-stroke and it held that setting perfectly until the 2oz tank ran out.

Pretty sure it's a plug problem but I can't even find my plug wrench.  Had one of the old Fox 4-way wrenches.

   5/16" nut driver or deep-well socket.

     Brett