My 1987 mariner 40 hp ob will not go above 2500 rpms at full throttle

by Thomas Hovermale
(Cross Junction, VA)

The compression is a good 140. The carburator was worked on in March of this year. Even had a mechanic try to adjust the carb on the water with no noticeable change. The boat starts ok & runs fine at the lower rpms. Any help would be greatly appreciated. Thanks, Tom H.

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