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  1. #1
    Texan78's Avatar
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    Can fouling plugs cause cylinder to run hot?

    Just as the topic says, can a fouled plug make a cylinder run hotter? I am sure smoking a lot more then normal and I thought it was the 3rd cylinder. Now I am thinking maybe it is because the first plug is fouled. But would that cause that cylinder to run hotter. Cooling lines are not blocked and are running freely, they are all new. it is just in that one cylinder that runs hotter. This is a new motor too with about 10 hrs.


  2. #2
    pokechop2006's Avatar
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    what kind of plugs does your ski call for?also sounds like you need to do a plug chop that will tell you which cyl is lean.

  3. #3
    Texan78's Avatar
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    NGK Bres9 which is what is in it. I don't think I am running lean. I have the lows set at 1 1/2 and factory is calls for 1 1/8. I had it running richer until I could get the pop-off set so I didn't damage the motor.

    Can you explain more about this plug chop?

  4. #4
    pokechop2006's Avatar
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    on the plug chop get it going as fast as you can wot then kill it with the stop switch then coast it out an pull the plugs an take a look.if any are ashy looking then there are running lean.the good one should look brown.that is assuming that all your cyl are fireing.

  5. #5
    Texan78's Avatar
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    Ah ok I know what you are talking about now. I just changed all the plugs to new ones and turned back the mixture screws to the factory settings and it seems to be strong and back to normal. Won't be able to tell until I get it on the water tomorrow but it seems to be fine now. All cylinders are firing and it is not smoking bad anymore like it was. So I think I was running to rich. Once I get to the lake tomorrow I will be able to fine tune the screws.

    -Thanks for the help.

  6. #6

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    If it was fouling, it would cause it to run cooler because you do not have complete combustion and the unburned fuel/oil actually cool down the cylinder. That is why an overly rich mixture runs cooler because the extra fuel cools down the combustion chamber.

    A lean mixture runs much hotter, a rich mixture burns cooler.

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