I was breaking in my 3-port sport today...first break in I have ever done. I was using a combination of the heat cycle method and the instructions that came with the engine. Unfortunately, the engine was much too cool - around 160 degrees. I have only idled my way through three tanks of gas so far, no real throttle yet, and no driving it around on the ground. LSN was flush, HSN was about 2 turns out from flush which is probably what contributed to the ultra-low temps (That and no foil around the head).

Have I already screwed my engine forever, or if I make sure that the rest of the break in takes place around 220-240 degrees or so will that help? I still have about 10 tanks to run through it as I slowly lean the engine out to make power.

I guess I learned my lesson (and found the break-in instructions on page 78 of this thread). Just wanted some input from people who have done this a lot! At least it wasn't some $400 mill, I guess.

Thanks!