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  1. #1
    thompsdw's Avatar
    Join Date
    Sep 2007
    Richmond, VA

    Spark Plug Corrosion Issue on 2006 SX210

    We just moved and haven't boated that much this year, but on Saturday we decided we would go out on the lake. I always prestart the boat and both engines sounded like hell. Ran bad rough. Would not idle. I decided to pull the plugs and this is what I found. . We moved to a location with brackish water, and at the new location we have only had the boat out on the water 2 previous times. I am very detailed on the flushing procedure, so I know that I didn't ingest water from the flushing procedure. Just not possible, although I know it can be a risk. I thought about head gasket leaks, but on both engines at the same time?

    After changing the plugs (put standard ones back not iridium) the engines ran great with no issues what-so-ever. Any ideas the cause or what I should look for?
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  2. #2
    MSRXP's Avatar
    Join Date
    Sep 2010
    Central MS
    That looks rough... It's more than likely the residual (salty) air left over in the cylinders that precipitates onto the plugs as the engine cools causing the corrosion especially if you ride in brackish/salt water. I would fog the engine(s) after each use. This should help fight the corrosion. Try this a few times and pull the plugs. Make sense?

  3. #3
    thompsdw's Avatar
    Join Date
    Sep 2007
    Richmond, VA
    Yep. Thanks.

  4. #4
    After a day on the water - I pour about 50ml of dish washing liquid into my garden hose, then connect it to the tap and proceed to flush the engine out.

    Obviously you need to keep the engine running for 10-20 seconds after disconnecting the hose to flush out excess water. However, I start my boat up again the next day without hose and at least another 2 litres comes out. I am told it is this water that can condensate in the exhaust and move up the cylinders and wreck your plugs.

    I would also fog my air intake system if I still had a supercharger.

  5. #5

    Join Date
    Jun 2010
    you should seez free on the threads so they wont rust

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