My Fantom FR12 engine is brand new and I was just breaking it in exactly how the instructions tell you to. Since it has ABSC construction it is different and you don't let it idle much and blah blah blah, its not really the important part.
Anyway, After about 4 tanks of half throttle I was leaning it out a bit. By now it probably only 3/8 of a turn in from what the factory set was. So the problem is that every time the car is slowing down to about jogging pace and then if i just tap on the break to stop the car it will die on me. I forgot what this is a syptom of. I don't think its to lean because i have only adjusted the high speed needle 3 times using 1/8 of a turn.
And the whole time (ran about 6 tanks through it) it never even got above 225. The instructions say that 230 is best for breakin because thats when the piston and sleeve expand enough to fit right. I was doing about 3/4 throttle runs back and forth down my street too. I don't know if this is a problem or not. (FYI: it was about 80 outside with a little breeze).
and im just adding this in but i was using the pro exotics temp gauge. Seems to be working pretty well for me. I will soon test it on boiling water to see how accurate it is. What a bummer if its way off. I think its accurate though.
thanks - and sory for make you read this much