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Thread: No Spark On My 500F Roadster

  1. #11
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    Quote Originally Posted by Old Cafe Racer View Post
    Just like gcrank1 I found the kill switch and key switch both kill the ignition (the key switch is two separate switches one on top of the other, one for the ignition circuit and other for the lighting circuit)
    On my bike the key switch was faulty and killed the spark, so I by-passed it and just use the kill switch now.
    To check,pull the plug to disconnect the key switch and run a meter on the two terminals, one way should be open circuit and the other zero resistance (or very close to it.)

    davy
    Thanks Davy. I'll need this type info after I get the stator checked out with Bmonk's guidance.
    Henry

  2. #12
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    Quote Originally Posted by bmonk View Post
    oldhenry,
    From the numbers you have posted ,I think that your stator and coil are OK.
    May as well check your pick-up coil, that's the small winding that acts like a set of contact breakers..
    white/red wire to black should be 16 ohms
    white/green wire to black should be 87 ohms

    What we are looking for (in all these tests) is a reading that shows a broken or burnt wire in the coil we are testing.
    When this occurs you will get no reading at all on your meter. A reading of a component out of spec is telling you that the part is coming to the end of its useful service life.
    In your case you have NO spark at all so if your pick up coil gives a reading then you have a broken wire or bad connection somewhere..

    the multi meter range you choose must be greater than the spec of the part you are testing.
    The closer you can come to the maximum of the part on your multi meter the more accurate your reading will be.
    So if you are getting a 1. and a 10.56 on your ign coil that is inside the plus-minus 20% or pretty close and unless you have a very expensive meter there is always a certain amount of meter error anyway.
    I just use cheap meters and I have found that when the results between the two(yes I also use two) meters vary it just telling me that one of them is soon to need a new battery.
    I'll get the pick-up coil tested today & any other detective work may wait until I get back from the Barber weekend.

    Once again, thanks for your help.
    Henry

  3. #13
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    Quote Originally Posted by MadMax View Post
    An article from Marcus @ Speedshop https://drive.google.com/file/d/0B0B...xmS2l3YW8/view

    He maintains that ignition problems can and will be evident at <10% tolerance of stated value, he's the electrical guru.........
    Max,
    Thanks for this reference.........I need all the help I can get.
    Henry

  4. #14
    Senior Member gcrank1's Avatar
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    IMO you are checking the more complicated end of things without eliminating the easy, and simple grounding out of the ignition tests first.
    '81 Yamaha SR500 Caff Racer
    '09 Suzuki TU250X 'The Silent Red Fellow'
    '98 Honda Shadow 750 ACE Deluxe
    In all things maintain your uprightness lest the road reach up and smite thee

  5. #15
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    Quote Originally Posted by gcrank1 View Post
    IMO you are checking the more complicated end of things without eliminating the easy, and simple grounding out of the ignition tests first.
    Blake, the pick-up coil got a clean bill of health & I'll start on your suggestions now. The fact that the engine killed @ a stop light & was difficult to start & the attempts to start involved turning the switch on & off several times makes me think the problem is in the switch.

    I have a few things to do to get ready for the Barber trip this weekend & if I have any left over time before departing, I'll get back on it: otherwise, I'll get on it next week.

    Thanks for your help.
    Henry

  6. #16
    Senior Member gcrank1's Avatar
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    Sorry that you have to work on it at all, my friend! But, with machinery it is 'always something'. You will solve this and add another bit to our collective knowledge.
    IIRC I did a thread on my switch re-burb, sans pics sadly, but I think you can follow my logic/explanation.
    Have a great trip!
    '81 Yamaha SR500 Caff Racer
    '09 Suzuki TU250X 'The Silent Red Fellow'
    '98 Honda Shadow 750 ACE Deluxe
    In all things maintain your uprightness lest the road reach up and smite thee

  7. #17
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    Electrical Gremlins: dead or asleep?

    I rested 2 days after the Barber/Hurricane "Nate" race & got back on the 500F electrical problem today & here's what happened:

    1. I reconnected all of the circuit plugs I had removed to check the stator per Bmonks excellent instructions making sure all connections were clean.

    2. When I reinstalled the spark plug cap & made sure to re-group the individual wires in the cable before screwing on the cap. I made a note to check length when fastened to the plug & if length would allow, I'll amputate about 1/4" to get a better connection to the cap & maybe coat with dielectric grease.

    3. I opened the R. H/B switch & everything looks factory new.

    4. I considered removing the ignition switch, but decided to check for spark.......hoping improving the spark plug cap had solved the problem.

    5. It cranked 2nd kick & I shut it down to get my riding gear for a test ride.

    With my gear on when I brought the indicator up into the window, the kick lever only had a 1/2 stroke. Knowing that a 1/2 stroke on the kick lever is not ideal, I kicked anyway & it cranked. I took a 20 mile ride & everything was perfect. It is hot & humid here so I'll take a longer ride tomorrow morning.

    I don't know if the gremlins are gone or just laying back waiting for me to forget about them.

    Henry

  8. #18
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    55 mile ride this morning. 1st. kick start & no issues. I hope it's cured. I don't see how a continuity check would prove anything with it running.

    Henry

  9. #19
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    Well, its good news that the bike is running well again and working as it should.
    What is not so good is you do not know why it would not run before....
    Sort of like a gun that misfired and you can not find a reason ...it will always be in your mind until you find something or you can come up with a logical theory.
    It is good that you have done the checks that you have, you can now recheck these components at any time in the future to verify that the numbers are the same. Often a failing component will read a progressively higher resistance.
    I have seen a few times over the years a broken wire in the wire harness where the main harness bends around the steering head ...with the motor running turn the handlebars lock to lock .If there is a broken wire the engine will stop and when the wheel is straight the wire will reconnect and the engine will restart again.
    Last edited by bmonk; 10-11-2017 at 07:41 PM.

  10. #20
    I'm sure Henry practices good motorcycle safety and always treats it as if will start and keeps the front end pointed in a safe direction.
    RD Bob.

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