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  1. #1
    cheatin' piston popper addicted's Avatar
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    Talking I think the raider is finally tuned

    Some piston wash pics.

    It starts instantly, runs WFO all day, won a trophy at mudbug, and I am finally happy with the jetting. I am tempted to go a little leaner, but I am hoping I can resist the urge.

    Stock pistons
    Stock head
    Stock compression
    65U flywheel and cdi
    65U carbs
    65U variable oil pump
    ProK flame arrestors
    reed spacer
    VF3's
    87 octane
    Jetworks

    Jetted:
    Low 97.5 97.5 97.5 1.25 turns out
    High 95 90 95 1 1 1.25 turns out
    Popoff 1.5 needle & seat 80g spring 38 psi.


    Turns an Island racing 11/17 J prop at 6900 rpm's.


    Still tweaking the pump, plate, grate, but runs pretty consistent 62ish on 87 OCTANE

    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by addicted; 10-04-2007 at 08:29 AM.


  2. #2
    Moderator beerdart's Avatar
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    I can beat that dog?????

  3. #3
    cheatin' piston popper addicted's Avatar
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    you are ON next time i head to CT

  4. #4
    I have a quick ? Dont want to hijack the thread but I wnat ot ask. How long can I expect to run a motor before I can expect to get a good piston wash reading.

    I took a few pics today of my GPR. Looked lean but I only have about 2hrs on it. Looked like it was starting to wash around the intake. The wash on yours looks damn near perfect.

    Sorry I just thought I'd ask.

  5. #5
    Moderator OsideBill's Avatar
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    Quote Originally Posted by HCP Designs View Post
    I have a quick ? Dont want to hijack the thread but I wnat ot ask. How long can I expect to run a motor before I can expect to get a good piston wash reading.

    I took a few pics today of my GPR. Looked lean but I only have about 2hrs on it. Looked like it was starting to wash around the intake. The wash on yours looks damn near perfect.

    Sorry I just thought I'd ask.
    Good question. I had readable wash at 10 hours when I pulled the head on my GP12 not sure when you can really start to see it though. I agree the wash in those pictures is what I shoot for just a tad on the rich side nice and safe

  6. #6
    cheatin' piston popper addicted's Avatar
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    I saw that wash pattern starting to develop after about 3 gallons, but it was very faint. I left it there, and what you see in the pics is after about 3 full tanks. It is a tad rich, but I actually brought in the HS needles a little after seeing it.

  7. #7
    old school big raider's Avatar
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    looks nice

  8. #8
    CatRunner's Avatar
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    I would like to see some more technical info about piston wash in a 2 stroke watercraft motor?

    Does anyone have any sites or info so that I can educate myself further into 2 stroke technology....?

    Thankyou in Advance......

  9. #9
    cheatin' piston popper addicted's Avatar
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    search "piston wash" in this site. tons of info.

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