Author Suddenly won't start  (Read 8345 times)

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  • Offline Smoky   us

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    Offline Smoky

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    Suddenly won't start
    on: Dec 25, 2022, 11.01 am
    Dec 25, 2022, 11.01 am
    No warning, nothing out of the ordinary. Pulled a couple of the plugs they are getting fire. All the usual sounds, fuel pump relay and fuel pump runs. All fuses ok,battery hot. Motor spins. Cam chain looks OK from timing access port. Not 100% sure fuel is making it to cylinders. When i removed tank only a couple of drops of fuel were in the line. Can I pour a small amount of fuel into each throttle body to see if it will hit?

  • Offline Smoky   us

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    Offline Smoky

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    Re: Suddenly won't start
    Reply #1 on: Dec 28, 2022, 07.16 pm
    Dec 28, 2022, 07.16 pm
    Anybody know?

  • Offline Zaniac948   us

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    Re: Suddenly won't start
    Reply #2 on: Dec 29, 2022, 02.23 am
    Dec 29, 2022, 02.23 am
    Just a bump for members much more knowledgeable than I.   :020:  Careful about backfires as with any engine not having the air cleaner in place but this would seem to be a good test. Can you check to see if the fuel pump is pressurizing the system properly? Do you have a z 900 manual? 

  • Offline Led Zed 70   us

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    Offline Led Zed 70

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    Re: Suddenly won't start
    Reply #3 on: Dec 29, 2022, 03.09 am
    Dec 29, 2022, 03.09 am
    Kickstand switch?

  • Offline Smoky   us

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    Offline Smoky

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    Re: Suddenly won't start
    Reply #4 on: Dec 29, 2022, 11.16 am
    Dec 29, 2022, 11.16 am
    Not kickstand...motor spins.
    Fuel pump pressure is my next try. Got some tubing yesterday to set it up. Yes luckily I have a shop manual. I tried putting a small amount of fuel down the throttle bodies it didn't fire, but I am hesitant about doing this. A very small amount is all I trickled in

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    Offline Led Zed 70

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    Re: Suddenly won't start
    Reply #5 on: Dec 29, 2022, 03.12 pm
    Dec 29, 2022, 03.12 pm
    Your getting air and spark so sounds like your on right track. Fuel pump, filter, or injectors? Dumb question but you are out of warranty? Good luck

  • Offline zed9   us

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    Re: Suddenly won't start
    Reply #6 on: Dec 29, 2022, 03.31 pm
    Dec 29, 2022, 03.31 pm
    You can spray starting fluid into the throttle bodies and the engine should run for a few seconds if all else is fine.
    Keep the fuel tank well away.
    Have a fire extinguisher and a damp towel on hand for safety.

  • Offline Smoky   us

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    Offline Smoky

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    Re: Suddenly won't start
    Reply #7 on: Dec 30, 2022, 11.03 pm
    Dec 30, 2022, 11.03 pm
    Yes out of warranty by a little. Starting fluid sounds a little over the top. Can't I use fuel instead?. I dribbled a little fuel down the throttle bodies but not much. I was hesitant to put much in them. Getting ready to set up fuel pump test with a long hose on the tank outlet

  • Offline zed9   us

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    Re: Suddenly won't start
    Reply #8 on: Dec 30, 2022, 11.39 pm
    Dec 30, 2022, 11.39 pm
    *Originally Posted by Smoky [+]
    Yes out of warranty by a little. Starting fluid sounds a little over the top. Can't I use fuel instead?. I dribbled a little fuel down the throttle bodies but not much. I was hesitant to put much in them. Getting ready to set up fuel pump test with a long hose on the tank outlet
    Starting fluid is easier and safer to use than gas. Itíll get the job done if thereís spark.
    Just spray it in while cranking.

  • Offline Smoky   us

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    Re: Suddenly won't start
    Reply #9 on: Dec 31, 2022, 09.07 pm
    Dec 31, 2022, 09.07 pm
    Ok. Just checked fuel pump. Per the manual pumping the correct amount of fuel during the 3 second start up activation
    Going to hesitantly try starter fluid....maybe?
    Wait! If the fuel pump works, the plugs are firing, the timing appears to be unchanged, I checked TDC with the timing marks......fuel injection?
    Last Edit: Dec 31, 2022, 09.12 pm by Smoky

     



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