1986 Yamaha 50 Pro, 2-cycle

We own a 1986 Yamaha Pro 50 since it was new. We live on the water. The motor has been very well maintained and has never given us any problems that we can recall. Still generates 5200 rpm at full throttle. Yesterday we were on our way to rescue a neighbor who spent the night on the water...their IO would not run. After running for 3 miles at 3500 rpm the engine suddenly had an uninitiated high RPM condition not caused by cavitation. This condition was not accompanied by an increase in speed or power. I instantly reduced power and shut the engine down. After restart, the engine would exhibit the same condition every time we attempted to gain more than 1000 rpm. We limped to our destination and home again. We pulled the boat from the water, inspected the lower unit lube for any signs of metal filings and found none. No obvious problems noticed upon visual inspection under the engine cover. Looking for some direction from the community if anyone experienced similar symptoms and what part failure(s) may have caused this condition. Thanks.

Sounds like you may have spun the hub on your prop.
take it to a prop repair shop and they can re-seat the hub.

dark_star said:

Sounds like you may have spun the hub on your prop.
take it to a prop repair shop and they can re-seat the hub.

Click to expand...

I was thinking about numerous things and then I read Dark Star's response. 'Nuf said here.