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Re: Outboard Power Loss, Why? [Re: H20 Dawg] #4227769 12/08/09 01:21 PM
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gary purdy Offline
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Then your getting too much fuel to #3 via the carb or the manual fuel pump diaphram. You also are getting too much oil or not enough fuel because the plugs should`nt be getting carboned up that quick. Still hav`nt seen where you changed the manual fuel pump diaphrams.


The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
Re: Outboard Power Loss, Why? [Re: gary purdy] #4233444 12/09/09 09:19 PM
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obsessedwithbass Offline OP
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Okay, rains finally stopped. Checked both fuel pump diaphragms and they are both fine. They both look newish to me. I think the previous owner had them changed 2 years ago before I bought it along with all the fuel lines under the cowl because they all look new to me. Changed primer bulb and external fuel lines. When I described that the newly installed plugs had carbon on them it was after I ran the motor while fishing for 2 days and probably went through 25 gallons of fuel. That's why all 5 of the plugs firing had some carbon on them except of course the one in broblem cylinder 3. They weren't dirty like a well used plug, but one could tell they had been used. Anyway, while I had the fuel pumps out, I squeezed the primer bulb enought to check if fuel would leak out of the fule pump pulse holes and nothing did. So, I took her out to the lake this morning and she's still weak. I think there's a gremlin living in cylinder 3 of my motor!

Re: Outboard Power Loss, Why? [Re: Mike Halfmann the boatmann] #4234023 12/09/09 11:43 PM
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OldFrog Offline
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Originally Posted By: Mike Halfmann the boatmann
I would be looking at ignition coils. You need to OHM each one, cold and hot, and run an inductive timeing light on each sparkplug wire while running. I'll bet the farm, you have one not firing at a higher rpm.


Did you do this?


Now, Donald...please pick John Bolton for your running mate.
Re: Outboard Power Loss, Why? [Re: OldFrog] #4234289 12/10/09 01:00 AM
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obsessedwithbass Offline OP
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I didn't ohm the coils but I forgot to mention in my first post that I switched them around so each cylinder got a different coil, but cylinder 3 still has no combustion. I'm so frustrated, it hurts! Maybe I'm not holding my mouth correctly shocked

Re: Outboard Power Loss, Why? [Re: obsessedwithbass] #4235569 12/10/09 07:03 AM
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OldFrog Offline
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Any water droplets on that plug, by chance?


Now, Donald...please pick John Bolton for your running mate.
Re: Outboard Power Loss, Why? [Re: OldFrog] #4235903 12/10/09 01:22 PM
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gary purdy Offline
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Did have a 1991 150 Yamy several years ago that after a lot of testing to try and find a running problem that #6 cylinder would drop intermittently. Another customers Yamy was in for service and after asking him for permission, I tryed his ICU on the problem motor and that fixed it. Only other thing I see from reading is that you hav`nt removed and inspected that carb. Good Luck


The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
Re: Outboard Power Loss, Why? [Re: gary purdy] #4236514 12/10/09 04:20 PM
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Performance Outboards Offline
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Hey give me a phone call today and let me see if I can help over the phone. 2813129856.


Call & Arrange your powerhead re-build today! I can work with trade-ins & I'll give you more for your core! Need a boat mechanic to come to you? I'm a Mobile Marine Tech. also. Call & schedule today! 281-312-9856
Re: Outboard Power Loss, Why? [Re: Performance Outboards] #4237496 12/10/09 08:30 PM
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obsessedwithbass Offline OP
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No water droplets, oldfrog, good idea though. Okay, the only thing now that seems obvious that I haven't looked at closely, without taking my motor appart, is the inside of the carb for mechanical failure. Cary and Gary might have the right idea. I might be getting too much fuel when I open up the throttle since idle and high rpms get their fuel from separate delivery systems. I might be getting okay fuel on idle but floods when I open the throttle. I'll take it off and look at it. I'll keep you guys posted on what I find.

Re: Outboard Power Loss, Why? [Re: obsessedwithbass] #4266733 12/18/09 08:44 PM
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obsessedwithbass Offline OP
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Okay, found the problem. Cary was right about the cylinder flooding. Fixed it and now it runs like it used to!! What caused the flooding was maybe a manufacturing defect. The center of the brace that the float hinges on was set about 1 to 1.5 millimeters further backwards compared to the other one. That in itself didn't cause the problem. The carb bowl gasket has an extra useless quarter or half inch squares behind each side of the float hinge brace that just sticks out into the bowl (don't know if float hinge brace is what the actual term for it is). Maybe the extra piece is to hold the gasket piece for the high speed jet at the right position for assembly but it seems a bit too much since it partially caused the problem. Anyway those extra pieces, when it finally curls a little from soaking in gas combined with the more rearward setting of the foat hinge, was hitting the float enough so it couldn't float high enough to close the valve and gas was just flowing freely into the bowl. SO i cut enough of that peace so it wasn't in the way and tadah, it worked. Now the float closes the valve when enough gas is in the bowl. Thanks for all the suggestions! My boat runs like it should. I love this forum! It really gets you to some good people! Merry Christmas everyone!

Re: Outboard Power Loss, Why? [Re: obsessedwithbass] #4268490 12/19/09 05:52 AM
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OldFrog Offline
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Glad you got her fixed !


Now, Donald...please pick John Bolton for your running mate.
Re: Outboard Power Loss, Why? [Re: OldFrog] #4385996 01/20/10 04:18 PM
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eyc0r (Corey C) Offline
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It seems like I have this same exact problem...

Cary and I will be talking soon! smile


"Most of y'all don't get the picture unless the flash is on..."
Re: Outboard Power Loss, Why? [Re: eyc0r (Corey C)] #4500007 02/16/10 08:45 PM
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eyc0r (Corey C) Offline
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After it was all said and done, Cary got me moving and moving quickly!

If you have a boat problem in the (Northern) Houston area, make sure you call Cary at 281 312 9856. You won't be sorry.


"Most of y'all don't get the picture unless the flash is on..."
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