Tweet
Hi all
I have a 1988 Yamaha 50D that makes a whirring noise at certain RPMs when underway. It seems to come and go at different RPMs but the frequency of the sound doesn't seem to change with RPMs.
I've linked two videos demonstrating the noise. Does anyone have any ideas as to what it could be?
The motor looks healthy, WOT reaches a bit over 35knts at around 5500RPM, cold starts usually need the choke and a little throttle for a few seconds but then idles down fine. The crank case was split in 2023 (unrelated to this noise) and there were no obvious problems.
First video (low throttle)
Second video (a bit higher throttle)
I have a 1988 Yamaha 50D that makes a whirring noise at certain RPMs when underway. It seems to come and go at different RPMs but the frequency of the sound doesn't seem to change with RPMs.
I've linked two videos demonstrating the noise. Does anyone have any ideas as to what it could be?
The motor looks healthy, WOT reaches a bit over 35knts at around 5500RPM, cold starts usually need the choke and a little throttle for a few seconds but then idles down fine. The crank case was split in 2023 (unrelated to this noise) and there were no obvious problems.
First video (low throttle)
Second video (a bit higher throttle)
Comment