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Thread: am I an idiot?

  1. #1

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    am I an idiot?

    Hey yall. i did a piston swap on my slt750. I assumed it was stock size so got a stock size piston and put it in. I got to looking at the piston i took out and it says 0.50...does that mean its been bored? if so that means I will be doing another piston swap doesnt it. Ok so I guess what I need to know is did I put in the wrong piston and if so does anybody have one in the right size I can buy??


  2. #2
    ph2ocraft's Avatar
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    It sounds like you have the wrong one.
    Did you measure your ring clearnace? If it's not within spec, you know it's way wrong, will not last and possibly cause some damage along the way.

  3. #3
    Water Bum Rodneyae's Avatar
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    I am an idiot too!!!! Yea the .50 means that it is .50 oversized piston. So the piston is the one that was in the ski or was it on that you bought?

  4. #4

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    did not measure ring clearence...im new at this stuff. I have run the boat with it and it turned over and felt smooth, but havent had it in the water or anything. dang it, guess I need to get a different piston in there then. i put a stock bore piston in. the one i took out of the ski had the .50 on it. I got this boat from my boss who had gotten it from his parents, so I guess he didnt know it had been bored either. so what do I need to find just a .50 over piston?

  5. #5
    ph2ocraft's Avatar
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    Did you happen to notice if the other pistons are .050 over as well?
    What type of piston is in there?
    Have a photo for us?

    Measure the piston you removed and you can actually compare it to a standard measurement.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  6. #6

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    i had the center jug off too and it was .50 as well. did not see the 3rd one though. i put a stock bore piston in there that i got used from a guy on here. sorry no photo, i could get one if you think it would help. how would i go about measuring the piston i removed? thanks for the help guys, im learning

  7. #7
    ph2ocraft's Avatar
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    Figure somebody went .050 on all cylinders. The chart above shows the measurements of the stock piston versus the .050 over, measure what you have (the old piston) and verify it's .050 over and then order up a piston.
    A picture would help in trying to find what piston you have.

  8. #8
    ph2ocraft's Avatar
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    The standard 750 piston is 69.75mm and the .050 (oversized) is 70.25mm all you need are some calipers or measuring device to measure it up.

  9. #9

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    gotcha, will get a pic and more info after class. thanks for all your help guys!

  10. #10

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    how do i post a pic again?

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