Chuck....the K&B site has some conflicting and misinformation on it. []

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SLOPPY RICH MIXTURE running is characterized by a very slow, irregular, sputtering
exhaust sound. The exhaust gas will be very smoky and contain many droplets of oil.
NEVER RUN AN ABC ENGINE AT THIS SETTING. The cylinder is not able to heat
properly and the fit will be ruined in a short time.

RICH MIXTURE running is characterized by a slower, sometimes irregular, sputtering
exhaust sound. The exhaust gas will be smoky and probably contain small droplets
of oil. NEVER RUN AN ABC ENGINE AT THIS SETTING. The cylinder is not able to
heat properly and the fit will be ruined in a short time.

FOUR CYCLING or SLIGHTLY RICH running is a rich type setting, but it is fast enough
to pull the airplane. This is the setting you normally look for before launching the
airplane because the engine will run leaner when airborne.
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The author says not too run the engine sloppy rich in para 1.
Para 2. says not to run it at a rich mixture.
Para 3. says four cycling "is a rich type setting", and one would "look for this setting
before launching the airplane".

The HP engine site recommended launching the engine in a "slight four-cycle mode"
as well for the initial break-in flights.

Where does either manufacturer say that running the engine....sport or racing, in a
four-cycle mode....will ruin the engine ? They don't do they ?

Yet Dar Zellon will claim that four-cycling an ABC engine will ruin it to his dying breath.

I contend....that is a false theory. Brian's experiment is proving it as well.
45 minutes of straight 4-cycling with out a sign of damage or wear !!!

FBD.