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Thread: 82 JS550 help

  1. #1
    PWCToday Newbie Ryanpb68's Avatar
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    82 JS550 help

    ok ready for this bear with me. i can only get this thing to fire on the rear cylinder with the front plug out. i have spark on both plugs. how do you check timing? also my ground goes from battery to intake manifold which is aluminum. would the aluminum have any difference on ground the bolt is steel and is bolted onto the block right so that should be a good ground. runs awesome on one cylinder. try to put plug in while its running and it dies. wont start on both. ive changed plugs, clipped wires. honestly im lost. compression ins 126 on both.
    so from what i can tell its got some mods. im pretty green and im learning so hit me with all the proven knowledge youve got. Thanks for your time.
    20180917_112746.jpg20180917_112757.jpg20180917_112904.jpg

  2. #2
    PWCToday Newbie Ryanpb68's Avatar
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    Re: 82 JS550 help

    also i did the seadoo 580 starter conversion to rule out the starter. originally thought it was just to slow to start. now the thing has plenty of starter turning it.
    Last edited by Ryanpb68; 09-22-2018 at 11:04 PM.

  3. #3
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: 82 JS550 help

    You could have plug caps or wires that are bad. You need to ohm between both plug caps and tell us the reading.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
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    '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
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  4. #4
    PWCToday.com Is My Home Away From Home BLRider's Avatar
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    Re: 82 JS550 help

    To help in your debug, the coil fires both cylinders every stroke, so if it runs on one cylinder it should be sparking both, check your spark plug caps and get some new plugs.
    Never argue with an idiot, they will drag you down to their level then beat you with experience.

  5. #5
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: 82 JS550 help

    You also should really upgrade to the stock "Jet Power" exhaust. It's way better than the old style you have. I have everything you need to do it too!
    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

  6. #6
    PWCToday Newbie Ryanpb68's Avatar
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    Re: 82 JS550 help

    ok so i ohmed it and it said 15.57. how much do you want for the exhaust and why is it better ?

  7. #7
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: 82 JS550 help

    Is that kilo ohms? If so then that 's about right, 5-7k for the coil and almost 5k each for the plug caps. Your head and carb are just screaming for a better pipe. You're not realizing the potential of those mods with that crappy little exhaust. Perform these tests listed on post #4. Let's get it running tight then talk about the exhaust.
    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

  8. #8
    PWCToday Newbie Ryanpb68's Avatar
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    Re: 82 JS550 help

    okay so stupid moment. tried a dif compression tester and well pooh. front cylinder has 90 back has 155 ish. soooo i pulled the engine. pretty simple and fun. its sitting on my bench and im tearing it apart i get the exhaust manifold off and i can see the front piston is ugly goudge and sleeve is very goudge ill post pics here a little later.so how do i tell what the actual size of this engine is. what do i have to measure. also while i have it out and apart what can i do to it to make my life fast and easier later in life. ill take any parts ppl wanna sell. pm me for my phone number and we can exchange info.

  9. #9
    PWCToday Newbie Ryanpb68's Avatar
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    Re: 82 JS550 help

    ok so here are the pictures. pic #1 front cylinder 90psi pic#2 front cylinder sleeve. pic#3 back cylinder 150psi pic#4 back sleeve
    20180923_211744.jpg20180923_211856.jpg20180923_211801.jpg20180923_211909.jpg

  10. #10
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: 82 JS550 help

    Hmmmm....that may hone out but I'm worried about the debris damage. Better check out that crank.
    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

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