Dave,
Since this is an Iron P/C do the break-in with 5% nitro and at least 25% - 28% total oil. I would use a 9x6 prop. Due short rich runs for the first 20 - 30 minutes, pinching the fuel line occasionally to bring it to a burst of 2 cycle. After that you can either fly it rich for another 30 minutes or run it on the bench till it hold a rich 2 cycle without sagging. Once you get to this point you can bump the nitro to 10% and use 25% total oil (50/50).

Best,    DennisT

 So what percentage do you try? For motors like Fox .35s, OS Max 35s or the old McCoy’s and K&B’s, use a fuel with 26 to 28% oil content; preferably half castor and half synthetic, up to 75% castor  is OK. These  motors have very small bearing surfaces, and are subject to much wear and heat, most are all plain bushing motors and most have unbushed rods. They need a lot of  oil  to help cool the engines. Since these motors run hot, they need  extra oil to keep them lubed,clean, and to carry out heat . If you have one of these that is  in very good  shape but, is  just starting to get some brown or black varnish plating on it, the synthetic mix will clean it  up for you, resulting in increased life.  Do not use the synthetic  blend in an old motor that has a lot of time on it with all castor fuels; the synthetic will remove the castor varnish off the piston and sleeve and will in some cases, leave you with the worn-out motor that had to start with.  Also always try to NOT use  prop shaft extensions with these engine, as it adds a  lot of  wear on the crankshaft bearing.

I read somewhere this has a spraybar with two holes?  I have to check it out.
It was loose when I first started it.  I tightened up the fitting and oriented the hole like most, down.