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Melting spark plug Honda 90

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  • Melting spark plug Honda 90

    I talked to an automotive mechanic about the spark plug problem in my previous post (spark plug story). He feels that the #2 cylinder is running extremely hot and softening the side electrode enough to bend. The engine compression is closing the gap. It's his opinion that the carburetor on that cylinder is running rich, thus hot. I've never changed the adjustments and am shy about doing it now.....any advice??

  • #2
    Re: Melting spark plug Honda 90

    I am not a Honda mech, but I would think that rich carb would run cold. I would be thinking too lean! At any rate carb rebuild time to make sure you get it right.

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    • #3
      Re: Melting spark plug Honda 90

      have you changed any ignition parts?sometimes the timing changes when ignition parts are changed..I would also have the timing checked then I would check for a lean condition.javsam

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      • #4
        Re: Melting spark plug Honda 90

        I dont follow this forum much. your question is interesting. YOU HAVE BAD things going on inside the combustion chamber. ask your auto mechanic friend about the effects of lean air/fuel ratioas at or near wide open throttle. my guess is his peepers will glze. most auto techs never hear of an issue at 4700 RPM after 20 minutes. if your wiping electrodes first thing is to do a leakdown test to inspect for any mechancal damage. if none is found go find why the combustion temps are spiking. usually a crossfire or a lean carb mixture. GSSo36 is correct. a rich mix will actually cool combustion temps but can be terrible on exhaust temps. doesnt matter if your a honda,mitsubishi,chevy or yamaha tech. they all have to work with very narrow paremeters.suck,squeeze,bang and blow. everything else just helps it go.
        no tech questions by PM, they wont get answered.
        you have to be trusted by the people that you lie to .

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        • #5
          Re: Melting spark plug Honda 90

          Well, spark plug is so exposed to high-voltage electricity that's why it easily gets damaged like melting. And for me, i'll just replaced it with a brand that would really last

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          • #6
            Re: Melting spark plug Honda 90

            It is not inconcievable that you have some water intrusion happening into that cylinder.A boreascope would be the tool of choice here too see if the top of that piston is washed out.

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            • #7
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              Re: Melting spark plug Honda 90

              The last post is spam and totally inappropriate for this forum, it need to be removed.

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