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Message Subject: Yamaha 300 Noise

muskyjeff84

Posted 11/20/2013 9:43 AM (#674488)
Subject: Yamaha 300 Noise

Posts: 52

I bought a new boat this year with a Yamaha 300. When the motor is at an idle in either forward or reverse I hear quite a bit of rattling or noise that sounds like it is coming from the lower unit or prop area. Is this normal? It seems to go away as soon as you speed up.

kjgmh

Posted 11/20/2013 10:24 AM (#674499 - in reply to #674488)
Subject: Re: Yamaha 300 Noise

Posts: 1095

Location: Hayward, WI

2 or 4 stroke? Make sure prop is mounted properly. If 2 stroke have the O2 sensor tube cleaned and checked, they can plug and make a bad rattle.

muskyjeff84

Posted 11/20/2013 10:38 AM (#674502 - in reply to #674499)
Subject: Re: Yamaha 300 Noise

Posts: 52

It is a four stroke

Jerry Newman

Posted 11/20/2013 9:42 PM (#674654 - in reply to #674488)
Subject: RE: Yamaha 300 Noise

Location: 31

muskyjeff84 - 11/20/2013 9:43 AM

I bought a new boat this year with a Yamaha 300. When the motor is at an idle in either forward or reverse I hear quite a bit of rattling or noise that sounds like it is coming from the lower unit or prop area. Is this normal? It seems to go away as soon as you speed up.

My Yamaha 250 4 stroke rattles just as you describe, especially after a long run idling in gear, I can really hear it chatter when it's running in my driveway while winterizing too.

You're not alone with this concern because the first time I noticed it a couple of years ago, it certainly got my attention too.

Edited by Jerry Newman 11/20/2013 9:43 PM

bob1

Posted 11/25/2013 5:33 PM (#675485 - in reply to #674488)
Subject: Re: Yamaha 300 Noise

Posts: 228

Any chance it could be the balancer? I have read on many web+sites that they can cause noise, especially after a long run. My F150 has been doing this for some time now. I just ordered a new balancer for mine. Yamaha has upgraded this part at least twice in the last few years. I have read that if the balancer goes, it will probably take the power head with it! Might want to check it out!
Bob

bob1

Posted 11/25/2013 5:35 PM (#675486 - in reply to #674488)
Subject: Re: Yamaha 300 Noise

Posts: 228

My noise does not sound like the lower unit though! My F150 is a 2006 model!

moemoe

Posted 11/26/2013 8:11 PM (#675727 - in reply to #674488)
Subject: Re: Yamaha 300 Noise

Posts: 27

My f225 does the same thing, what kind of prop are you running? quite often the stainless steel props have chatter at low speeds....mine does....switch to an aluminum prop and no problems...supposedly an rds prop will help...read page 3 here
http://yamahaoutboards.com/sites/default/files/pdfs/Prop-Shop-VOL_2...

muskyjeff84

Posted 11/26/2013 9:00 PM (#675739 - in reply to #675727)
Subject: Re: Yamaha 300 Noise

Posts: 52

I have been running a stainless prop. The link is very helpful. I was worried that it was a gear issue. Thanks for your help.

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