Thanx to all who replied. That's good news. I just want my engines to run for a long time, thus I like to do things the right way. A few years ago I bought a Saito 80 that was supposed to be used. Put it on the test stand and ran it. After a good warm up and then trying to get it tuned, the exhaust started to get dark. Black smoke isn't good. Tried to tune it, but after about 5 minutes it would get black smoke back. I think that the engine wasn't broke in or at least not correctly, and I overheated it or something. One of these days I'll learn how to take it apart and see what happened inside. That's one reason I'm trying to get me engines broken in the right way.
Thanx again,
Ricochet