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  1. #1

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    Rusty spark plugs

    This is my first 4-stroke so I'm going to assume that this is par for the course???? I never saw this on any of my other pwcs but they are all two strokes so I guess the oil in the gas prevents this?
    My 2015 FZS has 98.5 hours on it.

    Steve
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  2. #2
    Saltwater use ?? Lack of flushing

    Sent from my HUAWEI VNS-L31 using GreenHulk PWC Performance Forums mobile app

  3. #3
    Blow the water out of the exhaust after you shut the hose off from flushing

  4. +1 by:


  5. #4
    Ale's Avatar
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    number 2 ever leaner than others...

  6. #5
    Lake Lion
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    Quote Originally Posted by ctct2118 View Post
    Blow the water out of the exhaust after you shut the hose off from flushing
    I'd rather have rusty plugs than a blown clutch.

  7. #6
    I swap new plugs every spring. They are cheap to replace..
    Last edited by FXSHO_X_2; 11-16-2016 at 11:30 PM.

  8. #7
    Quote Originally Posted by hotbutta View Post
    Quote Originally Posted by ctct2118 View Post
    Blow the water out of the exhaust after you shut the hose off from flushing
    I'd rather have rusty plugs than a blown clutch.
    do it properly & no blown clutch

  9. #8

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    Thanks for the replies. I asked two Yamaha techs yesterday at the dealership and they both feel this is what plugs look like when 10% ethanol gas is used. They also thought that since these are the original plugs that there might've been some assembly lube or other contaminants that got baked onto the plugs in addition to the moisture in the ethanol gas.

  10. #9

    Join Date
    Feb 2016
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    I have run non-ethanol exclusively in my PWC since it was new for the same reason. The only problem is that most of the non-ethanol available at gas stations and marinas is 87 Octane. Sometimes I can find 90 Octane at a few convenience stores near the lakes I run on. For most of the ECU re-flashes available that I have seen, the vendors require 91 octane or 93 octane.

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