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  1. #1
    darkov's Avatar
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    '96 Sea doo spx 717 twin carb - backfiring problem

    i was riding the other day for couple of hours smoothly , i turned it of for half an hour and when i started it it would not go above half throttle no matter what and the sound of the engine changed to a more pitchy sound.....
    so i took it out of water and dissasembled and cleaned fuel filter and carburetors and tried with the hose on the dry and the carbs started backfiring above half throttle and spitting gasoline out

    help anyone !??????





  2. #2
    rotory valve, rotory gear / shaft

    ignition timing - broken flywheel key

    Do a compression check..

  3. #3
    darkov's Avatar
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    compresion is ok i checked
    nothing is broken

  4. #4
    Something is broken or it would be running right..

  5. #5
    20 feet Boy's Avatar
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    Where the rear cooling hose on the motor? Make sure The spark plug caps dint pull out where there zip tide.

  6. #6
    darkov's Avatar
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    spark plug are ok i checked also plug caps

    cooling hose was atached prior to shooting the video )

    could it be something simple to fix !?????

  7. #7
    darkov's Avatar
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    i checked rotary valve for clerance it seems ok nothing is broken or loose in there
    so i dismantled the carburetors again and cleaned everything thoroughly vith solvent and wd40 and put it back together

    but sadly nothing has improved on the ski , when i turn it on the trailer it starts imediatly no hasitation but when i press throtlle until half everything is ok , and after that if i ceep pressing throtle it starts to spit out gasoline and to backfire

    help please , somebody competent , how do i check the coils , magneto etc

  8. #8
    darkov's Avatar
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    i took everything apart , took engine out and i can see no reason to backfiring issue yet

    i have read somewhere that broken crank gaskets could cause backfiring so i am going to go that way but new gaskets are very hard to come by where i live
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  9. #9
    darkov's Avatar
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    also i noticed a small crack on the block but its wery hard to be the cause but i will repair it also
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  10. #10
    darkov's Avatar
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    removed the nut but i can not still remove assemblly i seems stuck
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