Several things:

* Break-in fuel 10-15% nitro 20% all castor preferred or 50% castor/50% synthetic. I would run 25% lubricant)
* Run three tanks through for break-in.
* Break-in porpeller - 11 x 5
* Start engine with the needle 2 to 2 1/2 turns off seat with finger over carb and battery disconnected flip engine over 2-3 times
- 1st tank start engine at 1/4 to 1/2 throttle and run borderline "4 cycle" rich
- 2nd tank run rich with full throttle bursts of 30-60 seconds.
- 3rd tank run tank dry varying throttle from 1/2 to full at 30-60 second intervals.

TT says it's broken in at this point. I would be inclined to run at least one full pint of 25% lube fuel through it before I would consider it broken-in. TT is dead set against an all synthetic lube but if you must run syn. run the engine on the rich side. TT also recommends that you use no more than 10% nitro after break-in. After you reach full R.P.M on starting, back off the needle (counter clock wise) 2-3 clicks.

I hope this helps.

Bill