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Max Online: 36273 @ 01/23/13 02:34 PM
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#12599216 - 01/28/18 04:41 PM Yamaha 300 Exhaust
Chuck72 Offline
Outdoorsman

Registered: 02/02/16
Posts: 185
Loc: 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.

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#12599513 - 01/28/18 07:52 PM Re: Yamaha 300 Exhaust [Re: Chuck72]
Gamblinman Online   content
TFF Team Angler

Registered: 11/26/02
Posts: 3491
Loc: 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.

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#12599533 - 01/28/18 08:05 PM Re: Yamaha 300 Exhaust [Re: Gamblinman]
SteezMacQueen Online   sleepy
TFF Celebrity

Registered: 11/02/14
Posts: 5679
Loc: 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!
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Eat. Sleep. Fish.

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#12599715 - 01/28/18 09:52 PM Re: Yamaha 300 Exhaust [Re: Chuck72]
T-racer Offline
Pro Angler

Registered: 08/24/16
Posts: 755
Loc: Melissa/Grand Prairie, Tx
You can find a replacement HPDI case for a decent price. Use that as a bargaining chip.
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Bullet 20XDC - Merc 250XS
Mallard Marine

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#12600199 - 01/29/18 10:53 AM Re: Yamaha 300 Exhaust [Re: Chuck72]
boatman025 Offline
Pro Angler

Registered: 07/16/10
Posts: 546
Loc: McKinney
I have some HPDI Lower Unit housing
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Hughes Marine Service
McKinney ,Texas

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#12600229 - 01/29/18 11:07 AM Re: Yamaha 300 Exhaust [Re: boatman025]
Chuck72 Offline
Outdoorsman

Registered: 02/02/16
Posts: 185
Loc: 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.

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#12600561 - 01/29/18 02:05 PM Re: Yamaha 300 Exhaust [Re: Chuck72]
Chuck72 Offline
Outdoorsman

Registered: 02/02/16
Posts: 185
Loc: 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.

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#12601529 - 01/29/18 10:28 PM Re: Yamaha 300 Exhaust [Re: Chuck72]
dk2429 Offline
Pro Angler

Registered: 03/28/16
Posts: 518
Loc: Pearland, TX
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
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Majek 22 Extreme/225 Optimax Pro XS
2006 Chevy 2500HD Silverado/6.6 Duramax LBZ



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#12602968 - 01/30/18 07:40 PM Re: Yamaha 300 Exhaust [Re: Chuck72]
T-racer Offline
Pro Angler

Registered: 08/24/16
Posts: 755
Loc: Melissa/Grand Prairie, Tx
Sweet enjoy new MOTA!!!
_________________________
Bullet 20XDC - Merc 250XS
Mallard Marine

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#12603424 - 01/31/18 05:19 AM Re: Yamaha 300 Exhaust [Re: dk2429]
Gamblinman Online   content
TFF Team Angler

Registered: 11/26/02
Posts: 3491
Loc: 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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