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  1. #1
    tomgtv's Avatar
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    How to Clean Spark plugs?

    I have a 2 stroke 951cc motor, plugs get a little fouled from
    use. What would you use to clean them?? The electrodes are
    good since relatively few hours are run on them.


  2. #2
    I've heard sandblasting as a last resort.

    I read somewhere about using brake cleaner and I did it to my denso iridiums this seasons and they have been running with 80hours so far.

    http://www.ngksparkplugs.com/techinf...200&country=US

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  4. #4
    steach's Avatar
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    T, why would you clean them. The 951 has two plugs, for $5 you can replace them.

    The main reason I see them dirty is from setup problems or usualy the wrong gap. The NGK's need to be gapped down to .22 (they come at about .39)

    Erin

    PS. Jerry, can you add a Doo 2-stroke section????????

  5. #5
    tomgtv's Avatar
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    Thanks for the gap tip. Yes, I know it's only $5, but the thrifty
    side of me says it would be so easy to clean them up every 5 hours
    or so since they wouldn't be wearing.

    Would dirty plugs cause hard starting problems?? It seems that is
    what is the main effect. Plus they seem to start missing after a few
    hours of running.

  6. #6
    JayZ's Avatar
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    like steach said, if your ski is set up and running properly (carbs, rectifier good) then you shouldn't foul any plugs. just for peace of mind, i put a new set in each season after i burn out the fogging oil and gas with stabilizer and don't change them until next year. fouling plugs indicate that you are running rich. do a plug chop to find out.

  7. #7
    tomgtv's Avatar
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    What's a plug chop? Is the rectifier part of the magneto charging
    system?? I have doubts as to how well my charging system is working.
    Any easy tests??

    Thanks!

  8. #8
    JayZ's Avatar
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    to do a plug chop, run full throttle for a minute or so then pull the lanyard to kill the engine. remove the spark plugs and inspect them. they should be a light tan/brown colour. if they are too dark or black, then you are rich and need to lean out the highs on the carbs.

    a bad rectifier can cause a missing problem. not sure which wire to pull on the 951's, but on the 787 engines, you disconnect the red wire and see if the problem goes away. someone here should know which wire.

    yes the rectifier is part of the charging system so don't run too long with it disconnected.

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