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  1. #1
    skigolfnut's Avatar
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    785 piston wash new pictures

    This is a picture of the piston wash right before I changed the front piston out,
    I had turned the highs out about an 1/8 of a turn, then I ran a couple of speed runs with the high compression domes in,
    any ideas??
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  2. #2
    Moderator beerdart's Avatar
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    Go another 1/4 turn rich.

  3. #3
    skigolfnut's Avatar
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    thanks,
    now that I have the new piston up front and the new Hot Seat head with 170 pressure I don't need lean burn down,

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    PTO lean go 1/4 turn out

    CEN good maybe 1/8 turn out to play it safe. You can always lean it out later

    MAG is looking like detonation to me on the perimeter. It may just be the picture.

    Do you see any pin needle sized "dimples" on your dome?

  5. #5
    Rasta Mon Condoms We Be Jammin!!!!! TxVirageTx's Avatar
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    check water flow for the mag,and dome orientation.could be running hot
    maybe the cyl and pipe hose got switch on that cyl??

  6. #6
    skigolfnut's Avatar
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    This was a race ski I bought used, and it was rode hard, I don't think the old racer ever used race gas like he should have, he just used octane booster, I raced it hard for a year and a half and never took the head or never did a compression test, when the ski was finally hit and totaled, I decided that when I put it in the new hull I was going to check everything out,
    That is when I found out that the mag cylinder had weaker compression, thus pulling the head and discovering the bad piston,
    The Watcon water routing says to make that water line match the rest, but I kept that one bigger like the stock set up, but I did the water routing with the jetworks valve,
    Now with the new piston and rings, and new rings on the other 2 cylinders I should be good to go, I have a boroscope light that I can check the wash with, and I am going to run a mix of VP-108 and premium pump gas,
    the next thing is to dial in my prop, I was running a 11-17 and a 10.5-16.5 and I am going to try a 10-17.5 to try and get a better top end for the straightaways,
    I will keep everyone posted on the results,

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