Motor cuts out when at temperature
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Thread: Motor cuts out when at temperature

  1. #1
    Junior Member andione1983's Avatar
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    Motor cuts out when at temperature

    Hi i have a cx500 engine runs fine once it hits temperature for approximately 10+-mins the motor starts to sputter then stops.

    Motor has been completely rebuilt by previous owner.

    All electronics still running when motor has shut down.

    Push the starter and it will not start again.

    It appears that once it's cooled down then it will start and run fine again.

    Any ideas where to start looking?

    Temp sensor or thermostat?

    What causes the motor to shut down.l is there a cutout switch.

    Engine temp stays on normal range does not show as overheating.
    Last edited by andione1983; 01-21-2017 at 07:47 PM.

  2. #2
    Super Moderator CXPHREAK's Avatar
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    If a CDI bike try disconnecting the black/white kill wire from the CDI unit. Could be just a dirty kill switch which can cause these problems from copper sulphate deposited between the switch terminals.
    andione1983 likes this.
    Rebuilding Handlebar Switches

    Rider 81 500C, Thingy Born a 78Z. Ozdeluxe born an 80 shadow.

    GET A MULTIMETER RTFM I am a CX500. If you maintain me I will run forever.

    http://cx500forum.com/mediawiki/index.php?title=Main_Page

    The WIKI link for all the good tech stuff. including free FSM's with addendums

  3. #3
    Junior Member andione1983's Avatar
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    I will have a look at this. It's running an ignitec ignition system now.. Not sure if something to do with this or not.

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  5. #4
    Super Moderator CXPHREAK's Avatar
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    With the ignitech this could well be your problem. As it failed you old CDI and stator windings made less electrical energy on a declining basis. Now you fit the ignitech and again have a fat spark.

    This is precisely the circumstances that shows up the dirty killswitch.

    I could be wrong but I'm fairly confident this will be your problem.

    Next guess would be overheating coils. Does the bike still have the airdam?
    andione1983 likes this.
    Rebuilding Handlebar Switches

    Rider 81 500C, Thingy Born a 78Z. Ozdeluxe born an 80 shadow.

    GET A MULTIMETER RTFM I am a CX500. If you maintain me I will run forever.

    http://cx500forum.com/mediawiki/index.php?title=Main_Page

    The WIKI link for all the good tech stuff. including free FSM's with addendums

  6. #5
    Junior Member andione1983's Avatar
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    I will switch back to original cdi if problems still there after I check kill switch

  7. #6
    Senior Member rscottp's Avatar
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    Don't take out the ignitech, find the actual problem. Follow CXPhreaks sage advice.
    andione1983 likes this.
    1981 CX 500 Deluxe
    Martha'a Vineyard, Ma

  8. #7
    Junior Member andione1983's Avatar
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    Thanks guys I shall investigate.. Don't you just love these forums, such good help.
    Last edited by andione1983; 01-21-2017 at 09:11 PM.

  9. #8
    Junior Member andione1983's Avatar
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    Checked the kill switch all ok (and cleaned the contacts)problem still exists.
    Went it shuts down and I try and start it I see there is no sparks on the plugs.

    Question. What creates the voltage to the spark plugs... Does the pulse come from the ignitec system... I measured with the bike running on my multimeter 6v on each plug wire. I'm assuming this gets converted to the plugs as a spark via the caps.. So now I need to test it when it shuts down and dee if the 6v is still coming out of the ignitec system.

  10. #9
    JC
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    Super Moderator JC's Avatar
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    You can't measure the output of the Ignitech with a standard multimeter according to the manufacturer - see notes here:

    https://motofaction.org/motorcycles/...t-honda-cx500/

  11. #10
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    The ignitech needs the two halfmoon-like coils.



    I had these coils in my hand and saw they had round cracks in the insulation around the ferrite rods.

    So I would check the resistance (Ohm) of the contacts 1/5, 2/5, 6/5 and 4/5



    At first when the engine is cold,
    then second Ohm-check when the engine is warmed up and cuts out.

    _____________________________________

    It's sooo easy to check the ignitech
    Look here:

    Name:  Versuchsaufbau.jpg
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Size:  2.91 MB
    Last edited by guelli02; 01-22-2017 at 03:14 AM.

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