Fox 15 break-in

Started the break-in for the old (new)Fox 15 slant plug yesterday. It's intended for my son's Jr Flite Streak.
I ordered some SIG Champion 15% nitro, 20% all castor fuel and poured about 12 oz out, into my old fuel to "spike" the nito a little. Then I added 8 oz of castor to the SIG fuel. This got my castor up to a hair over 25%.
Ran about 4 oz through the engine at a fast 4 cycle in 2-3 minute runs. Then anoher 4 oz in two seperate runs, varying the needle between just breaking into 2 cycle for about 30 seconds or so, then back to fast 4 cycle. Naturally I let the engine cool between runs. By the 4th run the engine started easily with only 3-4 flips. So far it seems like a great little engine. I'll run it some more tonight and see if that perception remains.
Any hints or tips for me on break-in of this critter?
Thanks
Tim

Just don't over prop it. They like an 8x4 or 7x6 when broken in. The 8x4 would probably be best for your ship.
Good luck,
George

Agree with George. 8-4. You're breaking it in correctly, I think.

What are you putting it on? Suggest a Streak, Jr. currell

Currell,

It's going on a Jr Streak. I'm also using an 8x4 prop.
What's a good finished weight for the Jr Streak?

That's right. Streak, Jr. I didn't read your initial post closely enough.

Right around a pound or an ounce or two over it is good.