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99 GSX RFI, Fuel Problems? Help Please??

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  • 99 GSX RFI, Fuel Problems? Help Please??

    Hi guys,

    First post on the forum after a friend introduced me here. Hopefully one of you guys has a little more two stroke knowledge than me. I have a 99 GSX fuel injected (the 110Hp) model, its a great little machine, and one that i have hardly ever had any problems with. But for about the last two weeks, the Ski has been backfiring at high revs, and blowing alot of white smoke (unburnt fuel?) My initial thought was dirty plugs, so i changed the plugs, and the ski now sounds alot better and cleaner through the lower and mid rev range, but it is still burning alot of white smoke, and still backfires at high revs. I havent had it in the water while it has been doing this so i dont know if that would change anything. Yesterday i took all the sensors that i could find off and cleaned them with some contact cleaner, A guy from sea-doo told me its likely a throttle position sensor problem, i cleaned up the three sensors that i saw off the throttle body, and any others i saw as well. I tried to isolate it and do it one sensor at a time then start it, and once it backfired on startup then just died, but the pop was alot louder than it usually is when it backfires when running. It started again no problems, and still has the same problem. If anybody knows, where exactly is the throttle position sensor located?? is there a way to reset this?? i'm fairly new to pulling apart skis, so if you could include a general location of anything that you think might fix it that would be appreciated. Thanks guys, im desperate to get this thing back in the water.



    Thanks Guys.

  • #2
    Re: 99 GSX RFI, Fuel Problems? Help Please??

    Hi guys - Sorry to bump an old thread - but i need some advice again.

    After i cleaned all the sensors last time the ski was still backfiring - So i just took it into my local seadoo dealer and they cleaned the RAVEs and the engine sounded like new again. After i had put about 10 hours with the clean valves started backfiring again. Changed the plugs - Cleaned the RAVES myself - and when i pulled them out they were filthy - looked more like 100 hours use then 10 hours use. Put them back in the ski and i now the engine sounds perfect again and has no problems. I was losing alot of revs and the ski sounded like it was missing throughout the whole range with the dirty valves.

    My question is dont you only need to clean the RAVES every 60 or so hours from what ive read?? would there be a reason why mine are getting dirty so quickly?? I tend to fog the ski pretty heavily, is it possible to overfog the engine??

    Thanks Guys.

    Comment


    • #3
      Re: 99 GSX RFI, Fuel Problems? Help Please??

      Originally posted by aussierider
      Hi guys - Sorry to bump an old thread - but i need some advice again.

      After i cleaned all the sensors last time the ski was still backfiring - So i just took it into my local seadoo dealer and they cleaned the RAVEs and the engine sounded like new again. After i had put about 10 hours with the clean valves started backfiring again. Changed the plugs - Cleaned the RAVES myself - and when i pulled them out they were filthy - looked more like 100 hours use then 10 hours use. Put them back in the ski and i now the engine sounds perfect again and has no problems. I was losing alot of revs and the ski sounded like it was missing throughout the whole range with the dirty valves.

      My question is dont you only need to clean the RAVES every 60 or so hours from what ive read?? would there be a reason why mine are getting dirty so quickly?? I tend to fog the ski pretty heavily, is it possible to overfog the engine??

      Thanks Guys.
      I have been working on rave valve rotax motors for over 10 years and I have never seen or heard of a rave valve causing backfiring. And I have seen rave valves so dirty that I had to use an auto body type slam hammer to remove them from the clyinders.

      Try not fogging the motor so heavily, it only takes a small amount of fogging oil sprayed into the intake while holding a fast idle speed.

      I think the backfiring is due to fouled sparkplugs.
      Bill O'Neal <br>
      WCM
      <a href="http://www.watercraftmagic.com"

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