Too bad the racing engine web site is written in FLASH. I don't do flash. That's what most ads are written in. If you don't have flash, you don't worry about crawler's and pop overs.

Now, not taking sides but only expressing my experience

On my first ABC(N) engine, I had never read much about the ABC(N) process. I was a ring man. Who reads that junk piece of paper that comes with a engine anyway?

Then, I started the engine on the bench and found that it didn't really like to run four stroke. That it could be very rich and still 2 stroke. So I broke it in running a rich two stroke. I would run short burst at rich W.O.T. and then at a lower intermediate speed (back and forth) the first four tanks while feeling of the head and watching the temperature that it was only warm and wasn't too hot. I only shut it down to re-fill the tank.

Then I couldn't resist any more, I found out what the engine was worth....

I still have that engine many flights and years later. It still runs like new, though it has burned crud all over the cylinder and muffler. I must have done no harm?

In fact, the first four or five ABC(N) engines, I had, were broken in this way for that seemed to be the way they liked to run.

And then some years later I read how to break in a ABC(N) engine or destroy it?(Do or Die) I was just glad that I had escaped with no apparent harm?

Someone mentioned George Aldrich. I remember he ruined a few early ABC engines with his Sunnen Hone before he got them figured out. He was a seat of the pants guy. He found out what worked (and didn't) for him the hard way. I don't remember him getting into any do or die break-in scuffs on the internet? He was a regular on the forums until shortly before his death.

Enjoy

Jim