| Author |
Message |
    
Richard Lin
Member
Username: richiniowa
Post Number: 4
Registered: 05-2009
| | Posted on Saturday, October 31, 2009 - 06:39 pm: | 
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Can anyone give me a rough estimate on what it might cost to do a top end rebuild on this motor. I have 85 and 90 on compression and it drinks fuel, fouls plugs, leaves a black ring on the back of my boat, and and has next to no power. Rebuild to include new pistons, rings, bearings, honing and/or boring, and labor to remove and replace all the above mentioned. |
Fastjeff
Senior Member
Username: fastjeff
Post Number: 7050
Registered: 09-2003
| | Posted on Saturday, October 31, 2009 - 08:07 pm: |
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400 bucks in parts alone.
Jeff |
Noel McBride
Advanced Member
Username: haventaclue
Post Number: 336
Registered: 05-2007
| | Posted on Saturday, October 31, 2009 - 08:42 pm: |
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Richard,Please note user name,but I would go for rings,bearings,a honing and DIY,otherwise attach chain,rope and use as anchor  . |
jamie campbell
Advanced Member
Username: outboard_doctor
Post Number: 712
Registered: 02-2009
| | Posted on Sunday, November 01, 2009 - 12:14 am: |
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I dont think it needs a rebuild i think the compressions fine and im sure your engine has decompression ports hence the comp readings...i would think you have a fuel problem like the fuel plunger not sealing and allowing excess fuel into the engine. |
Fastjeff
Senior Member
Username: fastjeff
Post Number: 7052
Registered: 09-2003
| | Posted on Sunday, November 01, 2009 - 05:58 am: |
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There may be "decompression ports" on that motor--the Yamaha designed Merc 25 has them--but that's not your problem. The rings are shot, and the bore may be too (for it to read that low). I'd advise looking around for another 9.9 power head on eBay. You see them now and then from motor that rapped an LU on a rock.
Jeff |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 7047
Registered: 09-2006
| | Posted on Tuesday, November 10, 2009 - 05:16 am: |
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sounds like fuel pump |
Richard Lin
Member
Username: richiniowa
Post Number: 5
Registered: 05-2009
| | Posted on Tuesday, November 10, 2009 - 06:59 pm: |
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The carb and fuel pump have been rebuilt by marine shop. Also has new tank and lines, as the auto blend is disconnected. With compression numbers at 85 and 90 I (and others) agree its time to rebuild.
One question...is something that I can do at home with a manual and no special tools. I got a quote from a retired marine mechanic that would do it for $600-800 and he said no $800 at worst case. This included parts, labor, and machining. |
Fastjeff
Senior Member
Username: fastjeff
Post Number: 7126
Registered: 09-2003
| | Posted on Thursday, November 12, 2009 - 06:11 pm: |
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It's not a bad "home" job--IF you're familiar with rebuilding small motors, and IF have the tools. If not, I'd look for a good powerhead on eBay first, one that came from a motor with a mashed lower unit. (They're out there.) Much cheaper.
Jeff |
