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  1. #1

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    Jul 2019
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    1995 SPI Compression Question

    Hello guys, I'm new to this side of the hulk. I've been working on Polaris skis recently and came across my friends jet ski. It was a 1995 Sea-Doo SPI I got one heck of a deal offered so I bought it. Here is where things get hectic. It had sat for a few years and leaked oil inside the hull and moisture built up causing some nasty liquid to fill up in it. so the insides are a bit rough but it had potential so I throw a battery on it and get me some compression readouts. On the MAG cylinder I got 120 solid but on the PTO side I was getting 100-105. Someone online said it should be fine so we took it to the water and it fired up and went quick for a few seconds. Then it started bogging I figured its a fuel problem and of course it had the amazing grey tempo fuel lines so, those have been replaced and the carb is currently being rebuilt. My main question is about the compression. I have the pictures below, is this something I should worry about?



    Once we get everything back together I will let you all know thank you everyone for helping!
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  2. #2
    Myself's Avatar
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    May 2007
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    Have you checked cmpression after you ran it some? Most people don't winterize properly including fogging oil. After sitting a few months or longer one cylinder will build more surface rust than the other.....I've seen them bad enough I could actually hear the rust scraping off the cylinder wall as I turn one over! I'm thinking that may be your issue if you see the numbers start evening out after running some.


  3. #3

    Join Date
    Jul 2019
    Location
    Branson, Mo
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    Alright, I did water test it a week ago and pulled it back out since there was fuel trouble. Once its ready to hit the water ill recheck it after a day or two of riding. Thank you!

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