I would not run the engine at WOT for the first 10 hours period.
You also need to vary the throttle during the first 10 hours not keeping it
at a constant rpm.
As for wide open - No. You should never run an engine at wide open for long
periods of time. How long do you think your car engine would last running
at 5000 (or whatever your redline is) in say 2nd gear constantly.
Keep it at about 2/3 wide open or less for the most part. Wide open for
short periods is fine but I would not hold it for more than about 2 minutes
at a time.

--
Tony
my boats at http://t.thomas.home.mchsi.com

"Lloyd Sumpter" wrote in message
...
Hi,

I just gave up trying to find a used 9.9 4-stroke and bought a Shiny
New Merc
9.9 4-stroke. It's LIGHT!

Anyway, I've always run older 2-strokes and often ran them WOT for hrs
at a
time. Now that I have a new one, I'm more concerned. Are outboards (esp.
4-strokes) designed to run WOT full-time? I know inboards are not, but
what
about outboards?

The manual doesn't say: just describes break-in period. They say for
the
first 10 hrs do not run WOT for more than 5 minutes. After that...?

Lloyd Sumpter
"Skeeder" Mirrocraft 12