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  1. #1

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    97 Pro 785 How's my piston wash

    Ok guys I finally finished putting together my pro and just completed the break in period over the weekend, I got some piston wash pics I'd like to have analyze and get some advice as to what I should do to the high and low speed screws. First alittle background on whats been done to the pro so far.

    -new 750 wsm pistons and rings
    -Sleaved cylinders bored and honed
    -All carbs rebuilt
    -new fuel lines
    -bottom end was rebuilt with about 5 hours on it before the top end blew
    -All other parts are Stock

    The carbs are jetted to the 97 pro jetting option #2 and I set the screws rich for safety sake (7/8 high, 5/8 low). I'm running the oil injection with a 50:1 premix in the tank for break in purposes.

    Oh I'd also like to give a big thanks to Jay at sharps for his excellent service repairing my cylinders and providing the parts nessessary for this rebuild.

    On to the pics
    Click image for larger version. 

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    PTO CEN MAG


  2. #2
    Moderator beerdart's Avatar
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    All three rich loose the 50:1 and recheck wash after a tank full.

  3. #3

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    The next tank will be straight gas, so does the extra oil effect the wash enough that you don't want me to touch the high & lower speed screws yet????


    Quote Originally Posted by beerdart View Post
    All three rich loose the 50:1 and recheck wash after a tank full.

  4. #4

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    Also could someone tell me if the washers used on the stock head bolts are some kind of special crush washer. Mine are starting to squish out like play-doh, can I just replace then with stainless steel???

  5. #5
    ujustlost's Avatar
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    Quote Originally Posted by Recniz View Post
    The next tank will be straight gas, so does the extra oil effect the wash enough that you don't want me to touch the high & lower speed screws yet????
    The lows have nothing to do with the wash, there for basically idol only or just slightly above, you wont smoke a motor on the lows, like mentioned above its definitely rich but that's the way I like to keep my ski's. you might loose a little top end because of it but i like to error on the side of caution

  6. #6
    bowsniper's Avatar
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    How could you be squishing washers when you have steel washers and bolts on an alum head? I doubt they could be crushed against that alum head. Use stainless and they wont rust.

  7. #7

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    I'm pretty sure these stock washers are made out of aluminium. They crushed and deformed at only 18 footpounds
    Click image for larger version. 

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    Quote Originally Posted by bowsniper View Post
    How could you be squishing washers when you have steel washers and bolts on an alum head? I doubt they could be crushed against that alum head. Use stainless and they wont rust.

  8. #8
    ujustlost's Avatar
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    Those must not be the stock bolts! The stock ones are stainless and have the washer built into them

  9. #9

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    Quote Originally Posted by ujustlost View Post
    Those must not be the stock bolts! The stock ones are stainless and have the washer built into them
    they're stock bolts and they used the washers in 97/98 if i remember and i always replace them with stainless spacers from mcmaster carr
    Last edited by K447; 08-05-2012 at 11:45 PM.

  10. #10

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    Do you know the part number???


    Quote Originally Posted by 785 lugs View Post
    there stock bolts and they ued the washers in 97/98 if i remember and i always replace them with stainless spacers from mcmaster carr

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