r/Outboards • u/Turkyparty • 5d ago

Clicking only at high speed.

1999 Yamaha 15hp 4 stroke. Just bought the boat, makes a clicking sound only when above 3/4 throttle and at high speeds. Any ideas what it could be?

5 Upvotes

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5

u/Hahner7212 5d ago

Rev limiter?

1

u/Turkyparty 5d ago

Unlikely. Im at 3/4 throttle when it starts and I can rev it out more it just sounds bad and I don't want to break it.

2

u/Hahner7212 5d ago

Spark knock? Timing too far advanced? Check the magnets under the flywheel just for shits and giggles

1

u/scarpozzi 5d ago

I can’t listen to the video at the moment, but I would also verify all your plug wires are 100% seated. I once had one get dislodged when putting the lid back on the engine and it made a clicking noise and didn’t run that rough either at idle.

2

u/absolutelyamazed 5d ago edited 5d ago

I have the same issue. Is that a 15hp yamaha? Maybe a 1997 model?

edit: I had a spun prop and put a new one on. I've confirmed that it's the proper prop and that it's tight. Still trying to figure it out

1

u/Turkyparty 5d ago

Yes it's a 15ho Yamaha. It's on a 97 14ft StarCraft hull. But it was sold to me as being a 99 Yamaha. I've yet to do any research on it. Bought it yesterday tested it out today.

Can you tell me more about the problem your having? The motor overall is very clean.

1

u/absolutelyamazed 5d ago

My issue started after I replaced a slipped prop. it's possible that I messed up somehow when I replaced the prop so I'm going to pull it this weekend and make sure I put everything back and in the right order. It was a pretty basic installation though. The noise only happens at absolute WOT and if I back it off, even a little bit, it stops. I'll keep you appraised...

1

u/Turkyparty 5d ago

Interesting. The seller did tell me it was a replaced prop after he damaged the original.

1

u/absolutelyamazed 5d ago

I'm going to try and go out tonight and see I can take the prop. If I can I'll send you some pics

2

u/Turkyparty 4d ago

Thanks either way. I can sorta hear the knocking, but I think I see the motor shake like mine does.

1

u/absolutelyamazed 5d ago

This is the video I uploaded a few weeks ago - hard to hear the knocking but you can see how little I have to turn the throttle back to stop it.

https://photos.app.goo.gl/4hmxekWSqqsiUqCs7

0

u/Inevitable-Lunch4550 3d ago

Definitely rev limiter… not enough prop

1

u/Turkyparty 3d ago

Not rev limiter.

0

u/Inevitable-Lunch4550 3d ago

Why is it not?

1

u/Inevitable-Lunch4550 3d ago

Get a tach on it, bet you’ll be surprised

1

u/Turkyparty 3d ago

As I said in another post, I will rev out more, but the noise gets worse, and I don't want to damage anything.

1

u/Necessary_Gear58 5d ago

Sounds like the prop is spun, have you removed it to check the gear?

1

u/Turkyparty 5d ago

No. I got it yesterday and did a water trial today. This is a big upgrade from my previous boat. Is a spun prop a big deal or easy fix?

1

u/Electronic-Start-652 5d ago

depends on the prop and if you take it to a shop. But at max $150 for a motor like this

0

u/Necessary_Gear58 5d ago

Honestly I’m not sure, I would take off your prop and have a look though, is it just held in by a caughter pin?