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  1. #1

    1999 SLX 1050 has weak spark

    The last I rode it worked great then last weekend I plan on winterizing and it would not start. First the battery was dead and seemed to be junk so I bought a brand new one. The spark is very faint and not a bright blue like it should be any help would be great.


  2. #2
    ph2ocraft's Avatar
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    What's the cranking voltage at the new battery?
    Did you properly charge it?
    Less than 10.6 and you get a non start, less than 11 volts and the spark will look pretty weak.
    Bigger question is, does it start with the weak spark?

  3. #3
    I did not check voltage but even with plugs in it cranks very strong and fast. No I cannot get it to start with the weak spark.

  4. #4
    ph2ocraft's Avatar
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    O.K. so check the cranking voltage at the battery first.
    I've seen a lot of weak sparking boats start with a fresh set of spark plugs, maybe try that first. If they don't start with a gapof .028, try .024.
    Fuels system is good?

  5. #5
    The fuel system was fine when I put it away.

  6. #6
    Lake Lion
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    Try trimming back each of the spark wires.

  7. #7
    ph2ocraft's Avatar
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    Quote Originally Posted by hotbutta View Post
    Try trimming back each of the spark wires.
    Only do this if you have screw on caps. If your ignition system has been updated or you have the crimped end connectors you will need to go through the unnecessary hassle of re-attaching or crimping the end connectors back onto the wire.

  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by ph2ocraft View Post
    Only do this if you have screw on caps.
    If your ignition system has been updated or you have the crimped end connectors you will need to go through the unnecessary hassle of re-attaching or crimping the end connectors back onto the wire.
    Remind me - which engines/years have the screw on spark plug wire ends, and which are crimped on?

    Fuji?
    Domestic?
    Domestic Updated?
    Fuel injected?

  9. #9
    ph2ocraft's Avatar
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    Quote Originally Posted by K447 View Post
    Remind me - which engines/years have the screw on spark plug wire ends, and which are crimped on?

    Fuji?
    Domestic?
    Domestic Updated?
    Fuel injected?

    Good question. I usually just look at the connector end, verify screw in or crimped and work accordingly.
    I would say all the Fuji engines have screw on, just not sure about the PRO.
    All updated Domestic systems are crimp, so we can pretty safely say anything from 2000 and up would be crimped However I'm not sure about the Domestic Twin as I see replaceable boots for the twins (doesn't mean they wire ends are crimped though, does it? ).

    Hmnnn, I'm failing miserable here, anybody else??

  10. #10

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    Is there any way you can check to see if there is any juice being sent through the wires even if the ends are bad and the spark isn't making it to the connector in the boot. I'd hate to cut the wires up if the are good. I'm pretty sure the ends on these will not reattach. Bound to be a device that will sense the current.

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