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grampa Brian Posted on Jul 25, 2019
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My 2006 Yamaha 4stroke 50 hp outboard motor prop no longer turns … is there a shear pin or is it some kind of rubber clutch gone?

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jws1013

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  • Yamaha Master 1,713 Answers
  • Posted on Jul 26, 2019
jws1013
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Joined: Apr 08, 2009
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It should have a rubber hub pressed into the prop. It can go bad and is in place of a shear pin. The rubber hub should allow the prop to turn at idle speed but will slip at higher speeds. You can get a new hub pressed into the old prop.

5 Related Answers

Anonymous

  • 2 Answers
  • Posted on May 13, 2009

SOURCE: the prop will turn on my minn kota endura 44 but

Odds are you have sheared the pin (slides through the prop shaft) holding the prop, or you have damaged the slot on the prop that the pin sits in.

Prop is secured to the shaft with a metal nut, or flat plastic wing nut. Remove the nut to remove the prop. You may have to pry, slightly, the prop from the motor housing. Removed, you will see a whole in the shaft where a pin should be located. If the pin broke, it probably hit the floor when the prop was loosened. If the pin is intact, examine the rear side of the prop and look for damage to the plastic slot where the pin would sit making contact.

If you've snapped the pin, you can make a replacement with a nail using a hacksaw. Replacement pins can also be ordered from Minn Kota. If the back side of the prop is damaged (recess for the pin to sit), the prop is toast. Replacement props are often carried by Walmart, and include a new pin.

If neither part is broken, perhaps the prop was just not seated on the pin correctly allowing the prop to freewheel.

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Anonymous

  • 77 Answers
  • Posted on Jul 12, 2009

SOURCE: T50 4stroke yamaha outboard

that engine should be electronic ignition, so I would suspect your problem is your coils.

Anonymous

  • 86 Answers
  • Posted on Oct 16, 2009

SOURCE: Spark plug gap 150 hp Yamaha outboard

The correct gap is .035

Anonymous

  • 677 Answers
  • Posted on Nov 20, 2009

SOURCE: I have a johnson 50 hp outboard when travelling in

In the hub of the propeller is a rubber bush that stops damage to the shafts and g/box if something is struck with the prop.These bushes do give way and are repairable.See your local boat shop or look for a specialist propeller shop.Probably the latter as the boat shops sends the props to them anyway.Its called the propeller hub bush or just the prop bush.Just take the prop into them and all will be good.Hope this helps you

Brian

  • 71 Answers
  • Posted on Jul 27, 2012

SOURCE: Minn kota trolling riptide 70, prop spins freely, sheared pin, retaining nuts turns freely, cannot get prop off, any suggestions

Use a gear puller.

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If it stalls out when putting it forward or reverse, then the problem could be a jammed gear train. If it still runs when shifted into gear but doesn't spin the prop, then the prop shear pin may have broken. This is done to prevent engine damage if the prop hits something hard such as an underwater log or such.
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You can get the appropriate pins in the prop not kits sold by minn Kota or thru major retailers.
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If you can't see a shear pin,it most likely will have a rubber bush in the prop hub that superceded shear pins.I am not 100% sure on your motor but that is what all motors have today.The bush is inside the hub of the prop and with the prop off,you cant see it.If the motor revs up when in gear,and you are getting no drive,this is the problem.Hope this helps
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It sounds like the prop bushing is bad. There are 2 systems for preventing gear damage,shear pins and rubber prop bushings.

The rubber bushing can be molded to the prop or there is a type that has a sleeve the prop fits over. If the prop has no sleeve you need to take the prop off and have it relined. It will fail soon, its just a matter of time. If you have the removeable sleeve, you replace the sleeve and just slide the prop over it and you are done.

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This means a shear pin or rubber hub may have broken. Take the prop off and look at the center. If there is rubber kind of crumbling thats the problem. Or if you see something like a broken nail-thats a shear pin. However if neither is true then unplug the sparkplug boots. Put the throttle in forward and turn the shaft by hand. If it still freewheels the shiftrod came apart inside the housing. You may want to take it in because the attaching parts or something in the gearbox came apart.
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