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1998 2 stroke triple 1050 Polaris, running problem

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  • 1998 2 stroke triple 1050 Polaris, running problem

    Jet ski runs but is flat in midrange and sometimes dies at that RPM range. Can then be hard to start. Suspect fuel starvation but do not know the cause. Any ideas? Thanks, Chief
    Chief

  • #2
    Re: 1998 2 stroke triple 1050 Polaris, running problem

    Do a compression test first thing. Then move toward eliminating thing like spark, fuel, cooling, etc.

    Mine did similar to yours and it needs a top end rebuild lost compression in first cylinder - so didn't spend a bunch of $$ or time for diagnosis purposes and I can just get 'er done.

    Let us know what you find out
    FrozenOkie -
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    • #3
      Re: 1998 2 stroke triple 1050 Polaris, running problem

      center carbs tend to go lean on the polaris triples resulting in toasting the center cylinder.
      Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

      1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

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      What’s behind you doesn’t matter.Enzo Ferrari

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      • #4
        Re: 1998 2 stroke triple 1050 Polaris, running problem

        Checked spark plug color and all 3 read healthy tan with dark perimeter. Will check compression today. Anyone know if there is more than just the one big gas filter in the fuel line? Spark and cooling appear fine. Thanks, will report back after checking compression. Will just a starter turnover out of water be OK for compression test? This rig runs over 60 mph once/if you get through the flat midrange! Chief
        Chief

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        • #5
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          Re: 1998 2 stroke triple 1050 Polaris, running problem

          Check your compression and if by some miracle you dont have at least one bad cylinder rebuild your carbs. Polris skis are notorious for burning up pistons if they run lean. Generally when a two stroke dies at speed it is due to a lean siezure. There are filters inside the carbs.

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