Yamaha 9.9 problems - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 06-02-2008
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Yamaha 9.9 problems

Could somebody offer some advice?

After I hit the bridge railing and broke the outboard bracket (it was obviously not my day, shoulda turn back after getting stuck in the mud...) and drowning the motor...
Managed to hang it on some line I had and got it out, washed with fresh water etc.
Got the carb rebild kit, flushed the motor with WD40, changed the spark plugs, cleaned the carb and assembled it with the new kit parts.
Now, clean tank, fuel line and fuel filter, fresh gas...
It starts every time with the choke knob out completely (and would run apparently, as long as I want), but would not run with the choke closed.

Could somebody offer some advice?
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Old 06-02-2008
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Why did the carb need re-building?
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Old 06-03-2008
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The Yamaha manual says once you open it, better to use the new parts - float, seals etc. - and in order to clean it have to disassemble
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Old 06-04-2008
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Is it too complicatyed or too boring? Nobody is answering in any way...
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Old 06-04-2008
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Ok, I'll dive in.... I am an A&P (airplane mechanic) I have a 4hp Yamaha 4 stroke) and the carb was giving me fits, the motor wouldn't idle...

I rebuilt the carb

Replaced a boat load of parts

Fussed over the motor for 2 weeks (and I came to the conclusion I should stick to airplanes! (much easier to work on) I took it to the dealer...

Either way, a new carb is like $140... how about buy a new carb and have yours rebuilt as a spare?

I'm out of thoughts, good luck!
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Old 06-05-2008
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well, thats a realists' approach...
Will call to see if I can get new carb and the price today.

Thanks
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Old 06-05-2008
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Since it runs, I would guess either you didn't reassemble the carb quite right or it just needs adjustment.
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Old 06-05-2008
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Was the motor running when it went into the drink? If it was you may still have water somewhere that it shouldn't be. Did you cycle the engine with the spark plugs out? This should remove any water left in the cylinders. When you pull a motor out of the water it is very important to "pickle" it with diesel or kerosene ASAP. This will keep internal corrosion from forming. If you did not do this you may have some corrosion in the cyliderr that may be causing your problem. Your best bet may be to take it to a dealer before you spend the money on a carb that you don't need.
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Old 06-05-2008
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Quote:
Originally Posted by vadimgo View Post
It starts every time with the choke knob out completely (and would run apparently, as long as I want), but would not run with the choke closed.
My guess would be that it is running waaayyy to lean (remedied by the choke) because either crud or bad adjustment is constricting gas flow somewhere in the carb.
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Old 06-05-2008
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I am going to assume that will not run or idle with out the choke on but will do both with the choke on.

I would look for a massive air leak after the carb, maybe a torn or missing mounting gasket.

or

A improperly adjusted float level.
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