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  1. #1
    Seakid's Avatar
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    2002 yamaha fx140 won't stay idles in water

    74 hours on it. Runs great and will stay idle on trailer. When get in water she will start n runs but when I let throttle off to idle she just die off. I took air box off and found there oil in it. The shop said it's caused by over fill and the spark plugs are fouled so I have to pump oil out or buy several extra spark plugs and use on the lake running let oil over flow and burn off until back to correct oil level. After surfing around onlines and there something try switch from cr9eb to cr8eb spark plugs the 8s are hotter and work better. What u think? Should I try the cr8 or stick with cr9?


  2. #2
    Cr9. But you shouldn't try and burn off your oil, you should remove it properly. Youll never get the proper lever doing that ...trick...Also if you got oil in your box, your filter has been soaked and will need to be cleaned. Petty sure rNd makes a reusable filter. The paper ones sucks?

  3. #3
    Seakid's Avatar
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    Ok I'll stick with cr9. And running for 15 minutes to get correct oil level? The filter I has r&d racing not the crappy paper one.

  4. #4
    Gap the plugs a few thousands under the minimum tolerance the book says and you'll get a more complete burn and a slight advance in the timing. It'll help with start ups and can give better fuel consumption.

    Bad coils cold also be the culprit. Do you have the manual that explains how to test a coil?

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