Hi Bob,

I have had good results with the Thunderbolt plug, Powermaster 10/22 fuel with 9x5 props.  I used the APC 9x5 to get CG where I wanted it on the Flite Streak ARF.

I found that 3 oz. tank gave close to 9 minutes of run time with rpm at about 9200.  I used uniflow metal tank, no muffler pressure, great runs.

As far as break-in, I followed the instructions EXACTLY and have had no problems, with the B25 or B40.
My break-in instructions said to do lots of short runs, with cool-down between runs.  I think I did 18 or 20 two minute runs with five minutes or a little longer between runs.  If I remember correctly, I used a wood 9x4 prop with a wet two cycle run for the break-in.

Don't remember needle setting, but would suggest 3 or 4 turns open to begin with, adjust as needed after starting.

Jim