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Old 27-10-2014, 04:25   #1
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Honda Outboard 15HP 4strokes Problem

Hi folks,

I have a small problem with my outboard. It starts fine, when I put it in forward it engages fine, but as soon as I accelerate, it simply revs up without much happening at the propeller level. At its slowest speed it will push my inflatable forward, but as soon as I rev up…the engine sounds like it is revving up but the propeller seems to not respond…
Any suggestion at what may be wrong? and possible course to fix it?
Many Thanks.

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Old 27-10-2014, 04:42   #2
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re: Honda Outboard 15HP 4strokes Problem

Assuming it has a rubber hub in the prop that acts like a shock absorber, it sounds as though this hub has spun, I think most modern outboards use the rubber hub, replaced the shear pin on older outboards.
If I'm right you need a new prop, hubs can be replaced on bigger, more expensive props, but on a little one I doubt it makes sense to do so,
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Old 27-10-2014, 04:48   #3
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re: Honda Outboard 15HP 4strokes Problem

A64pilot, thanks so much for the insight. I will take the prop out tomorrow and check for this rubber hub you mentioned. Hopefully I can fix this myself.
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Old 27-10-2014, 06:21   #4
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re: Honda Outboard 15HP 4strokes Problem

Yes, this engine has a rubber hub prop and not a shear pin. The hub is certainly replaceable - we have had it done with ours. They cost ~$15 and can be pressed in in a couple of minutes. Any good prop shop will probably have hubs and can do it.

You will not be able to fix it yourself unless you have a hydraulic press and the correct hub insert. Don't be tempted to drill holes and put in screws - everyone thinks this will work and it always fails.

If you don't have a prop shop nearby, then you might be able to purchase the hub somewhere and any machine shop with a press can take the old one out and put the new one in.

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Old 27-10-2014, 09:20   #5
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re: Honda Outboard 15HP 4strokes Problem

Quote:
Originally Posted by pepe67diver View Post
Hi folks,

I have a small problem with my outboard. It starts fine, when I put it in forward it engages fine, but as soon as I accelerate, it simply revs up without much happening at the propeller level. At its slowest speed it will push my inflatable forward, but as soon as I rev up…the engine sounds like it is revving up but the propeller seems to not respond…
Any suggestion at what may be wrong? and possible course to fix it?
Many Thanks.

Pépé
Sounds like a case of prop hub slippage. Is there a rubber bushing in that hub?
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Old 27-10-2014, 16:05   #6
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Re: Honda Outboard 15HP 4strokes Problem

Whats a new prop cost? How bad is your old prop as in wear to the blades, chunks missing etc?
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Old 27-10-2014, 16:09   #7
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Re: Honda Outboard 15HP 4strokes Problem

A second prop is a good idea regardless (they cost ~$65). My advice would be to buy another prop, rehub the current one and keep it as a spare.

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Old 27-10-2014, 17:24   #8
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Re: Honda Outboard 15HP 4strokes Problem

Thanks all for your replies. I am going to purchase a new prop as they are not too costly and rehab the old one and keep it as a spare. Will keep you posted on the results. Cheers
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Old 29-10-2014, 06:39   #9
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Re: Honda Outboard 15HP 4strokes Problem

Purchase a new prop for $200 and replaced it. Tested the engine and I am glad to report my problem is solved! Thanks all.
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Old 29-10-2014, 06:45   #10
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Re: Honda Outboard 15HP 4strokes Problem

$200! Is that US$? Where are you located? I'm glad it worked out for you.

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Old 29-10-2014, 06:50   #11
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Re: Honda Outboard 15HP 4strokes Problem

Wow, you did at least get dinner out of the deal didn't you?
Last time I bought a little prop it was for a 25 HP Mariner, I think I paid $50 or so for a Solas prop, I'm guessing you got a genuine Honda prop at least, maybe even SS?
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Old 29-10-2014, 07:00   #12
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Re: Honda Outboard 15HP 4strokes Problem

Yes, I was a little taken aback when I was asked to part with $200, but living in a small seaside town Dunsborough in Australia, I took it in my stride. Next time, I'll place an online order...
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Old 29-10-2014, 07:03   #13
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Re: Honda Outboard 15HP 4strokes Problem

Well, look on the bright side, you only paid $177 USD and only 110 British pounds, and you have a working outboard again!

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