Hello,

I have a nephew with a Evinrude 28 hp outboard about '98 model which
seems to have a lower unit problem??? It runs well at idle speed or
trolling speed but when the throttle is raised the motor revs up but
the boat does not speed up accordingly??? There is no grinding or
otherwise bad sounding noise noticeable. He has checked the lower
unit lube condition and it was fine. He also removed the prop but
found nothing noticeably wrong. He has not misused the boat/motor.
The prop is not even nicked. Any ideas as to what could be wrong
inside this thing?

Thanks for any help or info........

Steve