Lots of very good information here, I am ready to breaking-in my rebuilt motor. My problem is I dont have much time during the day, I take care of 2 kids and work at night, during the day I have about an hour window to do what ever i can. (Nap time for the kids) I can run the motor for 1 tank a day and be finish in a week. Is this okay? or should I wait till I have enough time to perform the heat cycling in one shot.

I am also pre-heating my engine before start-up with a butane pen torch. I kinda dont like to be carrying around a hair dryer or a heat gun in the park, a pen torch and a lighter is much more convenient for me. I do this by placing my palm about 8 inches away from the blue flame and then slowly placing it closer till I feel the heat, then thats how far away I would place it from the engine . I'll do this for about a minute until the head feels very warm to the touch, this is ofcourse before I put any fuel in the tank.

Am I doing the engine any good by warming it up this way? Or Am I doing it more harm than good?

Thanks,