550sx mysterious gremlin
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  1. #1
    PWCToday Newbie Grnwtr4life's Avatar
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    550sx mysterious gremlin

    Hey everyone hope youíre all brapping the last bit of summer away!


    So Iíve got a reeed ski I bought about 6 months ago and itís been as reliable as morning wood. Thatís until Labor Day weekend I was riding and it was somewhat sluggish kinda seemed like a plug was fouled so I rolled it on its side to try n clean the plug off. In the process I heard a little pop kinda sound. Nothing crazy it still runs but now sounds like a 4 stroke almost and still doesnít have that rocket ship feel like it did before. Iíve torn the block apart no damage inside everything is kosher. Did compression test sitting at 190ish (****ty gauge) changed out reeds no change still the same. Advanced timing 2mm I knew that wouldnít fix it but been wanting to do it, itís basically all stock motor with full westcoast pipe, westcoast waterbox, my exhaust return pipe is all aluminum as well. I cannot figure this thing out and itís killing me slowly went from riding daily to not riding at all. I was think blown head gasket but with my compression number it didnít seem likely Please help I need brapp therapy! Thanks in advance!

  2. #2
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: 550sx mysterious gremlin

    Did you check the reeds?
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  3. #3
    PWCToday Newbie Grnwtr4life's Avatar
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    Re: 550sx mysterious gremlin

    Quote Originally Posted by Myself View Post
    Did you check the reeds?
    Yeah I changed out the reeds they aren’t brand new but they looked good and sealed.

  4. #4
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: 550sx mysterious gremlin

    You have tried new spark plugs, yes??
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  5. #5
    PWCToday Newbie Grnwtr4life's Avatar
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    Re: 550sx mysterious gremlin

    Yes most definitely have new plugs in it and they are correct gap. I went thru tonight and double checked all the exhaust hose to make sure there wasn’t a hole in anything which there wasn’t.

  6. #6
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: 550sx mysterious gremlin

    It really sounds like you have a cylinder not firing. They will bg terribly and make a 4 stroke-ish sound. How about back it into the water, then run it for a bit strapped down on the trailer until warm and the issue presents itself. Hold throttle for 15 seconds while it's acting up, then kill it and immediately check spark plugs. Do they both look the same or is one much wetter?
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  7. #7
    PWCToday Newbie Grnwtr4life's Avatar
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    Re: 550sx mysterious gremlin

    That’s what I was thinking it was as well but both plugs are getting great spark. I’ll go buy a couple new plugs again and try out your suggestion. I tried it last week but I don’t remember what they looked like now I take too many bong hits to remember anything most of the time.

  8. #8
    I dream skis matt888's Avatar
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    Re: 550sx mysterious gremlin

    Ground one plug wire and see if it runs on the other if it does ground the other one, if it only runs on one you can narrow your search down.

    SOLD! HONDA AQUATRAX 2 SEATER
    1987 JS440 SUPERSTOCK
    1988 JS440 FREESTYLE
    1987 JS550 LIMITED
    SOLD AND MISSED VERY MUCH, 1994 WAVEBLASTER LIMITED
    WWW.HONDAOFWINTERHAVEN.COM
    1987 AM. WORLD CUP CHAMP
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  9. #9
    I dream skis E350's Avatar
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    Re: 550sx mysterious gremlin

    Quote Originally Posted by matt888 View Post
    Ground one plug wire and see if it runs on the other if it does ground the other one, if it only runs on one you can narrow your search down.
    Matt, I don't understand.

    How do you ground a plug while running?

    Do you mean start it and then take one spark plug wire off with rubber handled pliers or plug pliers?
    Learning Slowly...

  10. #10
    I dream skis matt888's Avatar
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    Re: 550sx mysterious gremlin

    Take one plug cap and put it on a head nut, so it is not on the plug, it should run on one cylinder, if it only runs on one but not the other you will narrow your search.

    SOLD! HONDA AQUATRAX 2 SEATER
    1987 JS440 SUPERSTOCK
    1988 JS440 FREESTYLE
    1987 JS550 LIMITED
    SOLD AND MISSED VERY MUCH, 1994 WAVEBLASTER LIMITED
    WWW.HONDAOFWINTERHAVEN.COM
    1987 AM. WORLD CUP CHAMP
    My album http://www.pwctoday.com/album.php?albumid=2000
    https://youtu.be/S3KAF71mm4o

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