more slow starting help
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  1. #1
    PWCToday Newbie
    Join Date
    Oct 2013
    Location
    Australia
    Age
    32
    Posts
    9

    more slow starting help

    Hi everyone.

    been a while since i posted so a tiny bit of history on my 83 JS550

    wifes parents own the ski from new, got stored in a farm for 15 - 20 years

    dragged it out, i spent some money and got it going. i was chasing a problem where the ski rpms would take off if you started it out of the water. the head studs had swollen and i ended up putting a hole in the original block when trying to get it apart.

    i found a 2nd hand engine which i've thrown a gasket kit through, i was having issues getting it started due to having the original round pump carby. i was spraying some WD40 into the cylinders when the little straw that goes in the nozzle flung off and into the cylinder. i cracked the ****s and left the ski to sit for like 9 months. during this time the engine cranked over fine. I've since updated to the square pump mikuni 44mm with a spacer plate and am trying to get the ski running again after taking the head off and removing the straw.

    everything is back together but i'm having the dreaded "slow cranking" problem i've read a little bit about. before racing out and spending money on a new starter so far:

    the engine will spin freely by hand (plugs in or out)
    the engine will spin fine on the starter with plugs out
    the engine will do little 1/8th kind of turns with the plugs in
    brand new 450cca battery
    extra earth wires
    backing the starter hold down bolts off slightly.
    running the battery directly to the starter bypass the electrical box

    before i put the new carby on i was doing a compression check and this same slow crank problem was happening, the compression gauge would get a couple of little puffs of 10 - 20 psi. after a handfull of cranks though it seemed as something free'd up as it started spinning faster and cranking over normally and i got 120 - 130psi on each cylinder. after getting everything back together again no amount of cranking will get it to turn over properly, the starter is also getting a bit hot so i'm reluctant to just keep cranking it.

    other then the starter is there anything else it could be? i've read a few post's about people updating to the seadoo 580 starter, but they seem to be a little bit harder (as most parts are) to get out here in aus.

  2. #2
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    Mar 2003
    Location
    wisconsin
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    52
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    8,832

    Re: more slow starting help

    Do a load test on your battery, just because it is new, does not mean it is good.

    If battery, and all cables are good, it is most likely your starter.

    DO NOT put a SeaDoo starter in. The Bendix drives are different, and they do not engage far enough into the flywheel teeth.
    RCJS also doing business as WATCON
    608-743-1305 9am to 5pm CST m-f
    email watcon@watcon.com

    Please visit our web sites

    new parts / products / services www.watcon.com
    used parts www.rockcountyjetski.webs.com
    thank you

    Please check out and like WATCON on Facebook

  3. #3
    PWCToday Newbie
    Join Date
    Oct 2013
    Location
    Australia
    Age
    32
    Posts
    9

    Re: more slow starting help

    so small update,

    i had a look at the flywheel while rotating by hand. and the flywheel would pause for a tiny bit then catch up with the rotation. I've pulled the cover off and found the crank shaft nut to be loose.

    so i can't only assume the wood ruff key is busted. probably why it won't crank properly loose and binding up.

    *sigh*

  4. #4
    PWCToday Newbie
    Join Date
    Oct 2013
    Location
    Australia
    Age
    32
    Posts
    9

    Re: more slow starting help

    just to tidy up,

    i ended up replacing the woodruff key as it had sheered, and torquing the flywheel nut properly to at least 100ft lb. re installed the same starter and everything seems to be working.

    cranks fine and starts.

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