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Old 05 September 2011, 12:01   #1
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Flooded Carburetor

Hello All,
I have a little RIB at Kew-on-Thames, on which sits a Yamaha 60hp 2-stroke petrol outboard (Yamaha 60FETO, precisely.)

We noticed she drinks a lot of fuel (certainly more than necessary), but spits a lot of it out raw. It's reasonably noticeable (pungent) when making a 180. So, the suspected problem (from advice I've been given) is that it's a flooded carburetor.

Attached are some (out of focus) spark plug pictures. The clean one (left, in the image) is from the bottom cylinder position of the three. To my eye, the electrodes didn't have a distinctive colour in any direction (tan/white/black), but there was some "carbon-esque" powder on the clean plug. Does that largely confirm the flooded carb' suspiscion?

I gather the fix involves simply(?!) removing the carb's, cleaning the float chambers, and rebuilding. I've had a poke around and it looks a little more fiddly to brand as "simple", but is that the gist of it?

rebuilding: am I right to be extremely cautious reseting torques, the carb' link, and whetever else is in there? Is there anything I need to be very, very careful with?

The diagram is pdf page 51 of this: http://motorka.org/doc/yam-remont-50-90.pdf

I'm a total novice, so any tips, tricks, do's, don't's, or advice is appreciated

thanks

Craig
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Old 05 September 2011, 13:48   #2
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Hmm is it me or is the air chamber missing. Also there seems to be a long bolt sticking out.
Thats not right.

check all the fules pipes to the carbs. PAGE 45

If your not up on stripping these things down then dont do it.

GO throught the carb set up. Its worth checking the pilot screw settings.

How is it running ? smooth or rough as a dog?
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Old 05 September 2011, 14:13   #3
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Assuming you've removed the plastic air intake/silencer, then a carb rebuild would be the way to go. The spark plugs look wet and black and should be dry and a light tan in colour. Yahama sell a carb rebuild kit (gaskets, 'o' rings, etc.)
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Old 05 September 2011, 21:35   #4
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Quote:
Originally Posted by spartacus View Post
Assuming you've removed the plastic air intake/silencer, then a carb rebuild would be the way to go. The spark plugs look wet and black and should be dry and a light tan in colour. Yahama sell a carb rebuild kit (gaskets, 'o' rings, etc.)
To be honest,not knocking the OP at all but given the knowledge level in the original post, the answer is to take it in to an outboard tech rather than suggest complicated solutions.
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Old 06 September 2011, 02:09   #5
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Don't know anything about 2S at all but is it correct that the idle air holes (presumably?) in the throttle discs are different sizes?
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Old 06 September 2011, 03:45   #6
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thanks for the quick responses.

The bolt sticking out was my doing. The only other piece removed at that point was the silencer. When it has been running, it runs smooth, certainly not rough.

I couldn't say whether the air holes vary in size

If the job is too big, then I'll take her to the shop, but all the advice so far has been that it's relatively simple.
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Old 06 September 2011, 19:16   #7
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Originally Posted by Nos4r2 View Post
To be honest,not knocking the OP at all but given the knowledge level in the original post, the answer is to take it in to an outboard tech rather than suggest complicated solutions.
Point taken.
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Old 14 September 2011, 12:35   #8
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All fixed (reluctantly, professionally)

It was a 6mm tear in the diaphram in the fuel pump.

thanks for the advice.

Craig
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