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Old 20 October 2012, 10:52   #1
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spark plugs

Hi all i have to ask you if these pictures that i have attached of my mercury 60 hp EFI 4 stroke 2010 model spark plugs have the correct burn sign. I am thinking that it is running rich but the black on the plugs it is not carbon as if i try to wire brush it it does not go away

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Old 21 October 2012, 03:16   #2
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Looks normal to me!
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Old 21 October 2012, 16:38   #3
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Looks good to me too!
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Old 21 October 2012, 16:53   #4
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They look ok better than some I have just replaced check the gap while you have them out
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Old 22 October 2012, 11:28   #5
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These plugs are champion and they have about 5 working hrs on them and they are the oem. Do you think that if i try another brand will work better as i am not convinced that they are doing the correct burn. What do you think?
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Old 22 October 2012, 11:32   #6
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Quote:
Originally Posted by Jason calleja View Post
These plugs are champion and they have about 5 working hrs on them and they are the oem. Do you think that if i try another brand will work better as i am not convinced that they are doing the correct burn. What do you think?
So despite all advice here to the contrary, what makes you say they aren't working right?

They look exceptionally normal to me. I wouldn't switch plugs, since whatever you switch to will be either too hot or too cool - since those are the correct plugs and they look perfectly normal.
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Old 22 October 2012, 12:30   #7
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I may think that they are not doing the right burn because when i am rinsing the motor in the water thank sometimes i hear a little missing. Or maybe i am getting crazy on it. I will take your advice and keep them. Thanks
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Old 22 October 2012, 13:02   #8
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Do you have a video (with sound) of this misfire?
Do all the plugs look like that? Or are any of them different?

If one of them is different, its potentially a bad plug or bad wire which is the cause of your misfire. However its quite likely to be unrelated to your plugs at all and something competely different - like an injector, fuel pump, or water in fuel issue.

Changing to a different non-spec plug can really mess up your engine fast, so unless you know these are the problem look elsewhere.
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Old 22 October 2012, 13:48   #9
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The colour is fine. Change them if you're worried, but don't mess with the spec.

Isn't your engine still under warranty? If it is, don't mess, make them fix it!
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Old 22 October 2012, 14:18   #10
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No i don’t have a video of it and yes all plugs are the same and i don’t think there is any problem with the injectors as it is still a brand new motor with 25hrs on it and fuel line was replaced new 6 weeks ago with all new filters including water filter separator too.
I have also added quick store to the fuel. Could it be the fuel treatment that causing it?
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