| Author |
Message |
    
paul ferrandi
New member
Username: paul3
Post Number: 1
Registered: 05-2009
| | Posted on Tuesday, May 12, 2009 - 12:26 pm: | 
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26 foot Shamrock with a 351 fresh water cooled 1988, velvet drive, 700 hours. Replaced original carburetor with new do to gas leaking by. Engine starts and idles fine. Fuel filter has been changed, and new gas. Increase RPMs under way and engine loses power. I plan on changing spark plugs, wires, points and con- dancer and adjust timing. Anything else I should look for if this doesn't work, thanks |
Don Liberman
Member
Username: tuna_tugger
Post Number: 17
Registered: 01-2009
| | Posted on Tuesday, May 12, 2009 - 12:57 pm: |
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In addition to what you plan on doing I would get rid of the points and install an electronic ignition kit they are cheep and well worth it. I would also change the impeller on the raw water pump. I had the same problem with my 23' correct craft fish with a 351 and finally found a small piece of silicone in the check valve at the gas tank. When I was in nutral I got plenty of rpm's but once I put a load on it it would loose rpm's and it would sputter and fart like crazy. I even changed the fuel pump. But it all came down to a restriction in the check valve. good luck!!! |
James Judd
New member
Username: cw2judd
Post Number: 3
Registered: 05-2009
| | Posted on Wednesday, May 13, 2009 - 06:30 pm: |
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If Dons extra ideas don't do the trick try replacing all the fuel lines and be sure to use marine grade. there could be a place ANYWHERE that colapses under pressure when your RPMs go up.... (because the lines are old) and the stuff you get at the auto parts store is too supple as well ;-) High Output electric fuel pump may help too.... and make sure the carb you put on is for a marine motor ... after putting on a Holly and and Eldebrock from the parts stores around here, we ended up with the original having to be rebuilt because it was the only marine one we could easily get our hands on! Hope you figure the prob out, and be sure to post when you do =) we are still having a prob with ours at 30 mph! ~Amy |
paul ferrandi
New member
Username: paul3
Post Number: 2
Registered: 05-2009
| | Posted on Wednesday, May 13, 2009 - 08:51 pm: |
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Thanks for the information I will be working on a boat this weekend, will update. |
oilslik
Member
Username: oilslik
Post Number: 89
Registered: 04-2008
| | Posted on Thursday, May 14, 2009 - 07:10 am: |
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Electric Fuel Pump |
James Judd
Member
Username: cw2judd
Post Number: 4
Registered: 05-2009
| | Posted on Thursday, May 14, 2009 - 01:31 pm: |
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Make sure if you do the electric fuel pump that it's adjustable and the highest output you can get ;-) speaking from experience! Amy |
paul ferrandi
New member
Username: paul3
Post Number: 3
Registered: 05-2009
| | Posted on Saturday, May 16, 2009 - 04:17 pm: |
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Replaced the spark plugs, wires, points, condenser, cap and rotor started boat up ran fine at all RPMs under a load. The plugs were covered with carbon deposits it seems that the old carburetor had a malfunctioning choke and the boat was running rich last year. Thanks all for your help, safe boating. |
oldmako
Advanced Member
Username: oldmako
Post Number: 117
Registered: 09-2004
| | Posted on Wednesday, May 27, 2009 - 01:43 pm: |
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If you're not aware....try http://www.fishtheclassic.net/forums/
It's the Shamrock owners site. |
