Question about kawasaki Zephyr 750 RS Motorcycles

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My -91 zephyr would not start, Ihave new sparkplugs,ignitioncoils and new carbholders

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  • mikaelljungw May 10, 2010

    I do have a spark but i think it is weak

  • mikaelljungw May 10, 2010

    what should the voltage be when the starter is engaged?

  • mikaelljungw May 11, 2010

    Hi

    What should the minimum voltage be on red lead at ignitioncoil when i crank it

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Hi
Presuming you've checked the fuses & that the engine spins when the starter is pressed :-
Check for a spark on each cylinder by removing the spark plugs - cleaning if necessary - re-install into plug caps & lay each on the cylinder head so that all have the metal part touching.
Check that the coils are wired correctly - black & red to 1:4, green & red to 2:3
Turn engine over.
If no spark at any then check that there is 12 volts between each red wire & earth, if not check for power & continuity across the kill switch, if not then check for power from starter relay (black /red), if not then check the side-stand,clutch & neutral switches are all working (if all 3 OK then suspect the starter relay)
If there is a spark & coils are wired right then suspect a fuel problem

I hope this helps
if not

Posted on May 09, 2010

  • 6 more comments 
  • steve May 10, 2010

    Hi the battery should have at least 12.6 volts across it with no load.
    Cranking voltage should be over 11 volts
    Charging rate 14 -15 volts

    Ride Safe
    Bike-Doc



  • steve May 11, 2010

    Hi
    Do not take measurements at the coil primaries, the wires go straight to the CDI unit which can easily be damaged, the induced voltage in the coil can reach 300 volts (on firing), & CDI's are very expensive
    Best to check cranking voltage across battery,
    Yuasa state :-
    Cold cranking = Current in Amps at which the voltage is 7.2 volts at -18c after 30 seconds
    So it all depends, but it shouldn't go below 7.2 volts at 'brass monkey' temperatures
    But most CDI's need 12 volts to work

    Where is this weak spark ? Across the spark plug electrodes - these can be dirty right up inside or the spark can track down the outside !
    Take 1 plug cap off hold the lead with insulated pliers or similar & watch the spark jump up to 7mm for the ZR750

    I hope this helps
    Ride Safe
    Bike-Doc


  • steve May 11, 2010

    P.S. This is not 'Live Chat' so give as much info as poss.

    Cheers
    Bike-Doc


  • mikaelljungw May 12, 2010

    The weak spark was on the sparkplug, but they are new. Could the starter worned out so that i have to change some bearing so that it workes more easy?

  • steve May 12, 2010

    Hi
    As long as the engine spins rapidly with starter engaged it is OK
    If the engine turns sluggishly then all the power is probably going to the starter motor
    If so it needs stripping, cleaning & greasing & probably new brushes
    If the plugs are blackened then this will cause a weak spark

    Ride Safe
    Bike-Doc


  • mikaelljungw May 13, 2010

    Hi, the spark jumped with no problem 8mm with the sparkplugg cap removed. Then i messured it and the resistance was over 1 M ohm

  • mikaelljungw May 15, 2010

    What should the ohm be on a sparkplugg cap?

  • steve May 17, 2010

    Hi
    Plastic spark plug caps have a resistance of about 15,000 ohms

    Ride Safe
    Bike-Doc


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