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Old 23 December 2012, 09:05   #1
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Yamaha 20 - 25 hp prop

Any one got a prop for a 2004 yamaha 20hp 2 stroke. It is the same as the 25hp motor.
My bush has spun and cant get it back on. I would use steel developements but they are shut till new year. So just seeing if anyone would have anything.
I have just bought the motor and it needed work which has been done but I cant test it.

Cheers dobra##
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Old 23 December 2012, 19:01   #2
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what else was wrong ?.
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Old 23 December 2012, 19:12   #3
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Carb clean and a good set up along with the usual servicing. Just come to a big stop now. Was hoping to go to my lake for a test tomorrow. The biggest shame is that I can't use this prop to get an idea of what prop I should get.
Will have to take the gearbox off in the near future. Little play.
You don't have a prop then????
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Old 24 December 2012, 05:52   #4
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sorry no prop, just interested as I bought the yam sib this motor was attatched too and have noted a slow puncture in one of the tubes that was not mentioned at the time of sale !, bit dissapointed really but I am sure I will find and mend it eventually. good luck with the prop.
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Old 24 December 2012, 05:56   #5
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Shame about the leak. Good luck with that.
I will just have to wait till steel developments is open.
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Old 24 December 2012, 06:07   #6
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Quote:
Originally Posted by dobra## View Post
Any one got a prop for a 2004 yamaha 20hp 2 stroke. It is the same as the 25hp motor.
My bush has spun and cant get it back on. I would use steel developements but they are shut till new year. So just seeing if anyone would have anything.
I have just bought the motor and it needed work which has been done but I cant test it.

Cheers dobra##
Some of the Yam props have a double bush - ie its split about 1/4 way along the prop. Trying pushing it on as far as it will go, back of the pressure a touch and give it a little twist to line up the splines on both parts of the prop.

It may then slide all the way on and still work ...just a thought.......
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Old 24 December 2012, 06:32   #7
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PeterM you are a top man. Thats whats great about forums.(Help)
Just been in the garage. I thought the Brass bush would have to have been taken out and alined and pressed back in. I had to hit it hard to spin it but its done. There must be a torque the prop nut has to be tightened to so as to stop it spinning again. Any idea of it?
Thanks again I'm back on track.
Was going to the lake today but a little late.
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Old 24 December 2012, 06:34   #8
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Camelgas. Have you tried the valves for the leaks. First port of call.
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Old 24 December 2012, 06:49   #9
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PeterM you are a top man. Thats whats great about forums.(Help)
Just been in the garage. I thought the Brass bush would have to have been taken out and alined and pressed back in. I had to hit it hard to spin it but its done. There must be a torque the prop nut has to be tightened to so as to stop it spinning again. Any idea of it?
Thanks again I'm back on track.
Was going to the lake today but a little late.
It shouldn't spin at all once its on ?.( or have I misunderstood your post ).... but I know from experience the 'front' part of the hub can spin and the back can still be solid ( 'unspun' ) - so will work fine.

You can see the two parts if you look down the inside of the prop.

The torque for the nut is probably on the web somewhere...I go with a gut feeling/ no play tightness that still allows me to get the pin through the nut.
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Old 24 December 2012, 06:59   #10
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Yes your dead right. The rubber lined bush has not spun. It was the brass one at the front. So when i took it off the rubber only allowed it to turn a couple mil so it bloked the track. All done and thanks again. I will still let you know when I get out again in christchurch.
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