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Old 30-08-2009, 11:50   #1
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Yamaha 9.9 - Slow Prop?

Hello, Recently when I attempted to move in forward gear my propeller did not turn fast enough to move the boat at more than about 1 knot even at high rpm's. Anyone know why this might ocurr and advice on remedial action.

Thanks, Jim
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Old 30-08-2009, 12:47   #2
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Probably your propeller hub insert is loose inside the propeller hub. Happened a while back to me. Likely the prop is only turning a fraction of the RPMs.

2 remedies- short term, drill some holes through the hub and place some screws through into the hub insert.
Long-term, buy a new prop

I am assuming the obvious here- the prop is not fouled, missing blades, and the gearbox is not fried (would probably be all or nothing rather than 1 knot)

gotta love motors...
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Old 30-08-2009, 12:47   #3
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Put it in gear and try to spin it by hand. Sounds like the hub is spun?
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Old 30-08-2009, 13:03   #4
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You've spun your prop. Get a new one.
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Old 30-08-2009, 13:34   #5
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Quote:
Originally Posted by malbert73 View Post
Probably your propeller hub insert is loose inside the propeller hub. Happened a while back to me. Likely the prop is only turning a fraction of the RPMs.

2 remedies- short term, drill some holes through the hub and place some screws through into the hub insert.
Long-term, buy a new prop

I am assuming the obvious here- the prop is not fouled, missing blades, and the gearbox is not fried (would probably be all or nothing rather than 1 knot)

gotta love motors...
Sounds like a consensus. No it is not fouled but I do ahve trouble finding neutral and yanking on the manual start chord when in gear catches. Could this ahve caused the problem?

Jim
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Old 30-08-2009, 13:56   #6
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No, it's usually caused by hitting something. I hit hard once but it didn't spin the prop. Two years later I goosed it when the dink was heavily loaded (6 6-gallon jugs of water and two adults) and the prop spun. I guess I had weakened the rubber hub when I hit and goosing it when heavily loaded finally did it. Make sure you get the proper prop when you get a new one. The size is on the prop but you have to really look carefully to see it.
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Old 30-08-2009, 16:17   #7
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The hub is shot, but don't throw away the prop. Any competent prop shop can rehub it for a fraction of the cost of a new prop.
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Old 01-09-2009, 13:32   #8
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The hub is shot, but don't throw away the prop. Any competent prop shop can rehub it for a fraction of the cost of a new prop.
Here on Nantucket they have to send it off island for rehub so - I sent for a new one hoping it will solve my latest engine problem! (a few people here said it could e the shear pin but. . .the boat moves forward; albeit slowly.)

Thanks all, Jim
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