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Thread: Weak spark

  1. #1
    Junior Member Joseph's Avatar
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    Weak spark

    Hi guys, I recently acquired a TW200, I was totally in the abbot, everything electric was wrong, I managed to turn it on, but when I accelerated it seemed to cut the spark, now I can not turn it on, only a weak and red spark is seen, I think the problem is that a low voltage reaches the CDI, does anyone know what voltage should be fed?

  2. #2
    Senior Member SportsterDoc's Avatar
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    1. What year?
    2. Miles?
    3. Battery voltage, key off?
    4. Battery voltage at idle?
    5. Battery voltage at fast idle?
    6. Condition of cable from coil to soark plug?
    7. Condition of spark plug
    2014 Honda CB1100
    2018 Yamaha XT250
    2016 Moto Guzzi V7 II
    2017 Yamaha TW200
    2012 Triumph Bonneville
    2002 H-D Sportster 1200 Sport
    2003 H-D Sportster 883
    1976 Honda CB750F
    1975 Honda CB360
    1970 Yamaha CT1
    1972 Yamaha CT2
    1972 Yamaha AT2/CT2
    1970 Honda SL350
    1970 Honda CL350
    1967 Honda CL160
    1967 Honda CB160
    1962 Honda CA110

  3. #3
    Junior Member Joseph's Avatar
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    1. Year 92
    2. The miles are not damaged the tachometer
    3. New battery 12V, key on
    4. Battery voltage at idle? I do not know, I could not turn it on again
    5. Battery voltage at fast idle? I do not know, I could not turn it on again
    6. Condition of the cable from the coil to the plug? It's good, check it with a multimeter and mark continuity
    7. Spark plug is new

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  5. #4
    Senior Member SportsterDoc's Avatar
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    Quote Originally Posted by Joseph View Post
    1. Year 92
    2. The miles are not damaged the tachometer
    3. New battery 12V, key on
    4. Battery voltage at idle? I do not know, I could not turn it on again
    5. Battery voltage at fast idle? I do not know, I could not turn it on again
    6. Condition of the cable from the coil to the plug? It's good, check it with a multimeter and mark continuity
    7. Spark plug is new
    If battery voltage is 12.0, it is severely discharged.
    What is voltage while trying to start?
    If under 10.5 the battery needs to be charged or has a bad cell

    Did you remove secondary cable from coil to check for corrosion?
    Last edited by SportsterDoc; 07-17-2019 at 04:13 PM.
    2014 Honda CB1100
    2018 Yamaha XT250
    2016 Moto Guzzi V7 II
    2017 Yamaha TW200
    2012 Triumph Bonneville
    2002 H-D Sportster 1200 Sport
    2003 H-D Sportster 883
    1976 Honda CB750F
    1975 Honda CB360
    1970 Yamaha CT1
    1972 Yamaha CT2
    1972 Yamaha AT2/CT2
    1970 Honda SL350
    1970 Honda CL350
    1967 Honda CL160
    1967 Honda CB160
    1962 Honda CA110

  6. #5
    Junior Member Joseph's Avatar
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    Zacatecas, México
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    La bateria se descarga ya que la moto no logra arrancar, la chispa se alcanza apreciar pero es debil y roja solo se moja de combustible pero no logra arrancar, y en el cable no hay corrosion

  7. #6
    Senior Member SportsterDoc's Avatar
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    Quote Originally Posted by Joseph View Post
    La bateria se descarga ya que la moto no logra arrancar, la chispa se alcanza apreciar pero es debil y roja solo se moja de combustible pero no logra arrancar, y en el cable no hay corrosion

    The battery is discharged as the bike fails to start, the spark is appreciated but it is weak and red only gets wet with fuel but fails to start, and on the cable there is no corrosion
    There may be ignition issues, but without a fully charged battery, diagnostics is hampered.
    Last edited by SportsterDoc; 07-17-2019 at 04:35 PM.
    littletommy likes this.
    2014 Honda CB1100
    2018 Yamaha XT250
    2016 Moto Guzzi V7 II
    2017 Yamaha TW200
    2012 Triumph Bonneville
    2002 H-D Sportster 1200 Sport
    2003 H-D Sportster 883
    1976 Honda CB750F
    1975 Honda CB360
    1970 Yamaha CT1
    1972 Yamaha CT2
    1972 Yamaha AT2/CT2
    1970 Honda SL350
    1970 Honda CL350
    1967 Honda CL160
    1967 Honda CB160
    1962 Honda CA110

  8. #7
    Senior Member SportsterDoc's Avatar
    Join Date
    Jan 2017
    Location
    Southern Nevada
    Posts
    1,077
    Do you have a kick starter?
    Is spark red or yellow while kicking?

    If no kick start, have you tried push starting, preferrably down a hill?

    If no go, repair or replacing CDI unit may be necessary...if ALL electrical connections are good.
    2014 Honda CB1100
    2018 Yamaha XT250
    2016 Moto Guzzi V7 II
    2017 Yamaha TW200
    2012 Triumph Bonneville
    2002 H-D Sportster 1200 Sport
    2003 H-D Sportster 883
    1976 Honda CB750F
    1975 Honda CB360
    1970 Yamaha CT1
    1972 Yamaha CT2
    1972 Yamaha AT2/CT2
    1970 Honda SL350
    1970 Honda CL350
    1967 Honda CL160
    1967 Honda CB160
    1962 Honda CA110

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