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Thread: Electrical problem :: No spark top cylinder

  1. #1
    apriliaforum Member BeeepSmoke's Avatar
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    Electrical problem :: No spark top cylinder

    Top cylinder spark is faulting from time to time. Some days the bike starts perfectly and works fine, but suddenly (could take hours or minutes) the top cylinder spark fails . There is not a particular situation that drives the spark to fail, like engine hot or could.

    Two important information:

    - When the top cylinder is not sparking the tachometer does not work either. A soon as the top cylinder comes alive, the tachometer starts to work.
    - When the engine (working only with one cylinder) hits 4K RPM the top cylinder starts to work, but misfire like it was sparking in the wrong ignition time.

    Anyway.... In order to find the cause of problem Im playing the elimination game:

    - CDI changed (it was my first obvious choice). No success;
    - Spark plug changed. No success;
    - With the engine running, I plugged and unplugged all wires in order to find possible bad connection. No findings

    Next steps:

    - Change/Test the Control Unit (I think its not the case);
    - Change/Test Coil and spark plug cable;
    - Change/Test Pick-up.
    - Change/Test AC Generator
    - Change/Test Voltage regulator
    - Change/Test Battery and fuses (short circuit)

    Any thoughts??

    1999 Aprilia RS 250

    What man would be without his machines?
    Power without lightness and grace?

  2. #2
    apriliaforum expert mattology's Avatar
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    it sounds like it could be a bad wire/connection if you ask me

    Get your confidence back with Aprilia.

    caution: the use of motorcycles may be habit forming. side effects include purchasing multiple examples of the same bike, in different states of tune, different years, or different models altogether. some motorcycles may be not running when purchased. some parts are no longer available. there are rare instances where aprilias are bought over the internet and upon arrival, they are not as were originally disclosed. there is a small group of people who cannot handle two stroke engines and motorcycle maintenance. if this is the case, you may not be a candidate for Aprilia RS250's.

    Aprilia. Ask your doctor if the RS250 is right for you.

  3. #3
    apriliaforum Member BeeepSmoke's Avatar
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    Today the bike started well, but after 5 minutes the top cylinder fails. it is getting worst... Ride this bike with only one cylinder is terrible, it moves like a RS 50... ;-( Tomorrow I will have time to check the rest of the electrical components.
    1999 Aprilia RS 250

    What man would be without his machines?
    Power without lightness and grace?

  4. #4
    apriliaforum Member BeeepSmoke's Avatar
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    And the Oscar goes to top cylinder Pick-up...

    I tested/changed every single component on the list above. The pick-ups were the last components that I tested and changed. Its called Murphy's law. Lets see...

    During this week I will ride the bike naked in order to make sure everything is runnig well.

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    1999 Aprilia RS 250

    What man would be without his machines?
    Power without lightness and grace?

  5. #5
    apriliaforum expert mattology's Avatar
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    loving the Tuono250

    Get your confidence back with Aprilia.

    caution: the use of motorcycles may be habit forming. side effects include purchasing multiple examples of the same bike, in different states of tune, different years, or different models altogether. some motorcycles may be not running when purchased. some parts are no longer available. there are rare instances where aprilias are bought over the internet and upon arrival, they are not as were originally disclosed. there is a small group of people who cannot handle two stroke engines and motorcycle maintenance. if this is the case, you may not be a candidate for Aprilia RS250's.

    Aprilia. Ask your doctor if the RS250 is right for you.

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