Brian,
Excerpt from my break-in thread:
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ORIGINAL: DarZeelon
Many sport type engines are virtually ready-to-use, just start and fly.
But I prefer treating my engines, as well as any engine I am entrusted with its break-in, as if it is an expensive, racing engine.
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This means most engines will survive unscathed, even the richest break-in.
So do you have the time and money to experiment?
Even [link=http://www.osengines.com/faq/product-faq.html#q2]OS themselves tell you[/link] not to do the break-in so rich as to four-cycle, in this engine type.
So FBD is welcome to tell Bill Baxter that his Q&A and his words in his own column are also 'hogwash'....
The one thing we all agree on is that Castor oil is essential for these engines (at least in North America).
Metal fatigue that causes failure, does not need metal-to-metal contact.
It occurs in sliding bearings in engines, as the oil film transfers pressure, causing them to fail eventually.
The piston could screech even without touching the sleeve's chromium, apparently.