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Jan 23rd, 2013
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Yamaha 300 Exhaust #12599216
01/28/18 10:41 PM
01/28/18 10:41 PM
Joined: Feb 2016
Posts: 211
Robert Lee, Tx
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Chuck72 Offline OP
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Robert Lee, Tx
I test drove a boat today with a Yamaha 300 hdpi 2005. I noticed a lot of water spraying out of the upper exhaust ports. Reverse and idle seemed to be the worst, not much spray in forward. I was told this was normal. My Merc 150 doesn't do it, at least not to the point I would notice it.. By spray I mean it was like a Pump up sprayer being constantly sprayed.

Also the back bottom 1/4 of the skeg is ripped off and the lower unit (looks like a backing incident) and the lower unit has a lot of battle scars and gouges. I know the skeg is cast and can be repaired, but it still concerns me. Oil looks good, just looks beat to heck..

The boat rides great and has plenty of power enigine seems fine running. Am I wrong to have concerns about these two items?


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2005 Charger 496TF 300 Yamaha HPDI.
Re: Yamaha 300 Exhaust [Re: Chuck72] #12599513
01/29/18 01:52 AM
01/29/18 01:52 AM
Joined: Nov 2002
Posts: 3,741
Yantis, TX
Gamblinman Offline
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Yantis, TX
spray out the exhaust port is normal.

You don't repair the skeg of a motor that high in horsepower and capable of the speeds it can deliver, you replace the case.

Re: Yamaha 300 Exhaust [Re: Gamblinman] #12599533
01/29/18 02:05 AM
01/29/18 02:05 AM
Joined: Nov 2014
Posts: 6,591
Red Oak, Galveston, and Pagosa...
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SteezMacQueen Online happy
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Red Oak, Galveston, and Pagosa...
Originally Posted By: Gamblinman


You don't repair the skeg of a motor that high in horsepower and capable of the speeds it can deliver, you replace the case.
So TRUE!


Eat. Sleep. Fish.
Re: Yamaha 300 Exhaust [Re: Chuck72] #12599715
01/29/18 03:52 AM
01/29/18 03:52 AM
Joined: Aug 2016
Posts: 901
Melissa, Tx
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Melissa, Tx
You can find a replacement HPDI case for a decent price. Use that as a bargaining chip.


Bullet 20XRD Comp - Merc 300XS
Mallard Marine Nacogdoches, Tx
972-837-9404
Re: Yamaha 300 Exhaust [Re: Chuck72] #12600199
01/29/18 04:53 PM
01/29/18 04:53 PM
Joined: Jul 2010
Posts: 583
Wylie
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boatman025 Online content
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Wylie
I have some HPDI Lower Unit housing


Hughes Marine Service
Wylie ,Texas
Re: Yamaha 300 Exhaust [Re: boatman025] #12600229
01/29/18 05:07 PM
01/29/18 05:07 PM
Joined: Feb 2016
Posts: 211
Robert Lee, Tx
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Chuck72 Offline OP
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Robert Lee, Tx
Originally Posted By: boatman025
I have some HPDI Lower Unit housing


Left you a voicemail


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2005 Charger 496TF 300 Yamaha HPDI.
Re: Yamaha 300 Exhaust [Re: Chuck72] #12600561
01/29/18 08:05 PM
01/29/18 08:05 PM
Joined: Feb 2016
Posts: 211
Robert Lee, Tx
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Chuck72 Offline OP
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Robert Lee, Tx
Thanks everyone... I knew the answer to the Skeg, sometimes you just need a few outside opinions to beat the answer you know into you head. Like T-Racer said I negotiated the price down and will have Gary at Hughes Marine Service do the work.


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2005 Charger 496TF 300 Yamaha HPDI.
Re: Yamaha 300 Exhaust [Re: Chuck72] #12601529
01/30/18 04:28 AM
01/30/18 04:28 AM
Joined: Mar 2016
Posts: 656
Pearland, TX
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dk2429 Offline
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I've never owned Yamaha, but water coming out the exhaust to me sounds like a healthy/happy engine! Same way that water leaks out the exhaust on cars


Majek 22 Extreme/225 Optimax Pro XS
2006 Chevy 2500HD Silverado/6.6 Duramax LBZ


Re: Yamaha 300 Exhaust [Re: Chuck72] #12602968
01/31/18 01:40 AM
01/31/18 01:40 AM
Joined: Aug 2016
Posts: 901
Melissa, Tx
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Melissa, Tx
Sweet enjoy new MOTA!!!


Bullet 20XRD Comp - Merc 300XS
Mallard Marine Nacogdoches, Tx
972-837-9404
Re: Yamaha 300 Exhaust [Re: dk2429] #12603424
01/31/18 11:19 AM
01/31/18 11:19 AM
Joined: Nov 2002
Posts: 3,741
Yantis, TX
Gamblinman Offline
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Yantis, TX
Originally Posted By: dk2429
I've never owned Yamaha, but water coming out the exhaust to me sounds like a healthy/happy engine! Same way that water leaks out the exhaust on cars


I get what you're saying, but its a little different comparing an outboard to an automobile engine. Water that exits from the exhaust on a outboard is residual water used to cool the tuner and downhousing. You hope the water from an auto engine is just condensation, because the other scenario gets expensive real fast.

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