Plugs and piston tops black
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  1. #1
    Resident Guru DamageInc's Avatar
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    Plugs and piston tops black

    96 xp
    Moderately built.

    Domes are clean wit no damage at all.
    Piston tops are blackish, but no damage.
    Plugs are very dark.

    What are these indications of?
    Too rich?

    Engine was overheating due to the jet I put in the head pipe being completely blocked.
    What is the advantage of putting in a jet, reducing the water from a 1/2" to such a minute opening as a 150 jet...? This is the 3rd time is clogged and overheated. It's a Rossier pipe, and that's what's recommended.
    96 xp stocker w/ the works
    96 xp stocker
    96 xp project
    92 X2 650/750 conv build

    90 JS440/650sx conversion
    04 YfZ450
    05 GSXR 1000

  2. #2
    Resident Guru DamageInc's Avatar
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    Re: Plugs and piston tops black

    20180605_171904.jpg20180605_171938.jpg20180605_183042.jpg

    Jetting is...
    145m
    75p
    2.0
    95 gm

    1 1/2 low speed
    1 1/4. High speed

    110-115 mid pipe
    150 stinger w/ fcv
    96 xp stocker w/ the works
    96 xp stocker
    96 xp project
    92 X2 650/750 conv build

    90 JS440/650sx conversion
    04 YfZ450
    05 GSXR 1000

  3. #3
    Frequent Poster Keno's Avatar
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    Re: Plugs and piston tops black

    On my Spec2 I run clear visu filters before the water injection jets. I like the FF401C. Do not get the sintered bronze ones. They plug too fast.

    The Jets are to limit water in the injection points, allowing you to alter the pipe temp.

    Its normal for there to be some buildup on the Pistons. What you want is a nice clean ring around the edge called piston wash.
    You may be a little lean on the jetting.

    Someone will have to chime in on Rossier tuning. I'm not familiar with them.
    Last edited by Keno; 06-05-2018 at 11:40 PM.
    96 xp - not stock
    RCW Brawler

    Braap!!

  4. #4
    PWCToday.com Is My Home Away From Home Cliff's Avatar
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    Re: Plugs and piston tops black

    Mandriva knows Rossier!

    Ask him...
    What would Chuck Norris do?

  5. #5
    Resident Guru DamageInc's Avatar
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    Re: Plugs and piston tops black

    My pilot jet might be lean? I thought if it were too lean, my plugs would be ashen or white, rather than the charcoal they are. And I think the low speed screws were out easily a half turn past the recommended 1.5
    I'll put in new plugs, test comp, and rebuild the Raves. They're oozing like they do.

    Thanks Keno, I'll put a filter in that line and get a new jet.
    Funny how well they run right before they take a ****...lol
    96 xp stocker w/ the works
    96 xp stocker
    96 xp project
    92 X2 650/750 conv build

    90 JS440/650sx conversion
    04 YfZ450
    05 GSXR 1000

  6. #6
    Resident Guru hafweigthr's Avatar
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    Re: Plugs and piston tops black

    Piston wash looks good. (Carbon) black buildup on pistons and plugs looks too rich on oil. Are you running premix (what oil and ratio)? If not how is your oil pump setting?
    Raves will ooze excessively too if rich on oil.
    The thought that leads to no action is not thought - It is dreaming!!
    Think Big!!

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  7. #7
    Resident Guru DamageInc's Avatar
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    Re: Plugs and piston tops black

    It's premix. 40/1 Penzoil marine 2 stroke.
    Used to run Amsoil, but no one sells it anywhere near here.

    Thanks for the response
    96 xp stocker w/ the works
    96 xp stocker
    96 xp project
    92 X2 650/750 conv build

    90 JS440/650sx conversion
    04 YfZ450
    05 GSXR 1000

  8. #8
    Resident Guru mandriva's Avatar
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    Re: Plugs and piston tops black

    Rossier jet kit for 787

    43 cc and flame arrestor
    140 Mag and 145 PtO
    75 pilot
    needle 2.0
    95 spring. (28 pop off)
    high screw 1 1/4
    low screw. 1. 1/4

    i use this jetting! Without issue 7280 rpm all day


    115 mid pipe
    200 stinger
    without jetwork! Junk part for rossier pipe! I loss holeshot with it!!
    i use ipone or klotz 40.1

    timming curve #5 and correction 1




    Head mod by rossier (joe benner)
    185 psi/43squish
    Attached Images Attached Images
    Last edited by mandriva; 06-07-2018 at 05:31 PM.
    Rossier 7250 rpm
    110 mid pipe/200 stinger
    185 psi/Head 41cc/43squish
    Solas concord 15/23

  9. #9
    Resident Guru mandriva's Avatar
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    Re: Plugs and piston tops black

    Rossier 7250 rpm
    110 mid pipe/200 stinger
    185 psi/Head 41cc/43squish
    Solas concord 15/23

  10. #10
    Resident Guru mandriva's Avatar
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    Re: Plugs and piston tops black

    Quote Originally Posted by DamageInc View Post
    20180605_171904.jpg20180605_171938.jpg20180605_183042.jpg

    Jetting is...
    145m
    75p
    2.0
    95 gm

    1 1/2 low speed
    1 1/4. High speed

    110-115 mid pipe
    150 stinger w/ fcv
    Normal condition premix!! But use the better oil like ipone/klotz/brp/
    You got excessive carbone !
    Donít worry about mid jet pipe blocked! The only caution is burn silicone coupler!!
    I recommend highly use filter sand for seadoo! I have one for sell!

    i am curious! What is the impeller you used? And rpm?
    Last edited by mandriva; 06-07-2018 at 08:28 PM.
    Rossier 7250 rpm
    110 mid pipe/200 stinger
    185 psi/Head 41cc/43squish
    Solas concord 15/23

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