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  1. #41
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    this sure beats going thru pretty much the same thing then have the OP come back a month later and say "oops, I forgot to turn the gas on"

    (that actually happened here)

    certainly not your average issue..and as xander cage is infamous for saying:

    I LIVE for this shit!

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  3. #42
    Let me out of here......I need to go on Greenhulk!
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    Wait so you didnt change any parts this last go around? Could you post a short video of how the starter reacts with your new procedure if it s not too much trouble?

  4. #43

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    Quote Originally Posted by K447 View Post
    What size battery do you have installed?
    https://www.autozone.com/miscellaneo...cca/178908_0_0
    It's made by East Penn Mfgr. and it has a 18 amp hour and 310 CCA output.

  5. #44

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    Quote Originally Posted by TMiller View Post
    Wait so you didnt change any parts this last go around? Could you post a short video of how the starter reacts with your new procedure if it s not too much trouble?
    I put in two new batteries-the first one was manufactured in May '20 and based on suggestions earlier in this thread it may have lost effectiveness from sitting on the shelf uncharged for a year. I exchanged this for one made in July '21. I also installed a used coil/spark plug lead/cap assy. I found on ebay. My theory was that the coils were worn and output voltage is hard to read. At the time I tested it with these two new components, cylinder #1 was non-functional because the spark plug threads were stripped (I didn't want to waste the money on a Time-Sert thread repair kit if I couldn't get it to fire). It fired immediately on the three cylinders that were working so I bought the kit and put an insert in #1. The hard start returned and I was back to square one.

  6. #45
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by pro1200 View Post
    https://www.autozone.com/miscellaneo...cca/178908_0_0

    It's made by East Penn Mfgr. and it has a 18 amp hour and 310 CCA output.
    17.5 Amp-hour rating, Deka ETX20 equivalent

    There are several larger capacity Powersports battery sizes you might choose.
    https://www.eastpennmanufacturing.co...Flyer-0278.pdf



    ETX16 has a 19 Amp-Hour capacity, 325 CCA

    ETX18 is 20 Amp-Hours, 340 CCA

    ETX30 is 26 Amp-Hours and 400CCA

    If you can fit the ETX30 size battery that would provide the strongest starting cranking effort with the least amount of voltage droop * while cranking.
    The ETX30 battery weighs 35% more than the ETX20, and delivers about 30% more CCA. Generally speaking the heavier the AGM battery the more power it can deliver.


    Note: CCA ratings are somewhat useful for general battery comparisons but we are not actually starting our watercraft engines at zero degrees F.
    The downside when looking at CCA ratings is that the terminal voltage gets down to 7.2 volts. This may be well below the minimum voltage required by the engine electrical system to deliver ignition.

    Shirtsleeve air temp conditions allow the same batteries to deliver higher than CCA rated amps. The CA and MCA spec testing will have higher amp ratings, but also with the 7.2 volts minimum.

    https://www.mechanic.com.au/news/how...ou-really-need


    * I do not know what is the lowest voltage your high performance engine requires while cranking.
    For Polaris 2-stroke PWC the general rule was a minimum of 10.6 volts at the battery while cranking. Below 10.6 the engine would crank away but the ignition system may not fire up properly.

    I do not know what AWG wire size the factory Kawasaki battery and starter cables are. You may find that using a size larger/thicker AWG cables reduces voltage losses in the battery and starter motor cables while cranking.

    Also, minimize the length of each of the heavy battery cables, including the negative ‘ground’ cable. Shorter cables have less voltage loss.

    Depending on how your hull is arranged you may consider relocating the battery and start solenoid to reduce cable lengths. The goal would be to reduce the aggregate length of all three cables when added together.

    Thicker and shorter heavy cables will deliver the most cranking energy to the starter motor (and to the engine electronics). The result should be faster cranking RPM and quicker engine start times.

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  8. #46
    Click avatar for tech links/info K447's Avatar
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    Sometimes the start solenoid itself can be a (perhaps minor) cause of reduced cranking power. Start solenoids can develop internal contact resistance as they age and are used. This affects the voltage delivered to the starter motor.

    If you are looking to maximize cranking energy consider installing a new high quality start solenoid, especially if you are also doing everything else to maximize engine starting vigor.

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  10. #47
    Take the time to smile sirbreaksalot's Avatar
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  11. #48
    Take the time to smile sirbreaksalot's Avatar
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    Bing Bing Bing We have a winner ............ I agree Sean ..... from the vid Id be sure thats the issue too.......... Id just unplug the coils and do the same vid.... Ibet it cranks just fine then
    Quote Originally Posted by smokeysevin View Post
    The 15f starter is actually reasonably competent and worked fine on these skis in the past.

    What is the compression (psi) at?

    On my 15f with 12.5:1 pistons it would try to kick off too soon on cranking when I was building my timing map and would stall the starter motor. When that happened, the current draw was huge and it would drop the battery voltage to the point that it would often reset the ecu.

    Backing the cranking timing from ~10 degrees to 3 completely fixed the issue and it would fire no problem. That motor was I think 215 psi once the rings seated.

    Ohm out all the temp sensors and do the check on the tps, you could be telling the motor to give you way more cranking advance than you need if the temp sensors all read cold or it could be trying to run in flood clear mode or something.

    Mechanically it sounds fine and cranks over as fast as I would expect any 15f to on a good battery and starter, I don't think the starter, motor, or battery are at fault.

    Sean


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