yamaha 1998 150HP outboard motor

by SteveG
(St. Petersburg, FL)

It runs really well at 25+mph/4000+rpm for about 20 minutes. Then while running, the engine slowed down big-time, to below 2000 rpm. Now I can't get it above 2000 rpm as it continuously powers down below 2000rpm.

What do you suggest that I do to solve the problem? Thank you!

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