Question about 2003 Kymco Venox 250

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No spark on my venox 250?

I removed spark plug and pressed on engine case and hit start button but no spark? i tested both cylinders and no spark in either? any suggestions? many thanks

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  • graham davies Nov 30, 2011

    no power to coil. where do i go from here?



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Possible failure of the ignition unit. you need to trace the voltage to the coil, the trigger voltage if absent then the ignition system is defective. Check the input and also the 12 volt to the coil , if coil is heating it can be faulty.

Posted on Nov 30, 2011

  • graham davies Nov 30, 2011

    there is no voltage to coil with ignition on, even when pressing starter button

  • graham davies Nov 30, 2011

    right there is 12v volt to coil when ignition is on but no pulse voltage from other wire when pressing starter button. ignition unit faulty?



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Do a compression test. Check for spark at the plugs BUT best to have new plugs.

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Could you take a moment and rate my answer? Thanks!

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How to Test Engine CompressionAn engine depends on an equal compression reading in each cylinder to run smoothly. If poor compression exits in one or more cylinders it can cause a rough idle condition and low power. A compression test can be performed to check wear or internal damage. To start a engine compression test gauge is needed. There are two types of gauge styles, one threads into the spark plug hole which is more accurate. The other style of gauge is constructed with a rubber plug that is meant to be pressed against the spark plug hole, this style of gauge is difficult to use. To perform a engine cylinder compression test follow the steps below.
  • Remove ignition coil connector or ignition system fuse to disable power to the ignition system
  • Test ignition system to ensure that the power to the system has been disabled
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Engine Cylinder Compression Gauge
  • After the compression gauge has been inserted, use the starter to crank the engine over for about five seconds. Use about the same five seconds to test the remaining cylinders.
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  • Remove the compression gauge and reinsert the spark plug
  • Follow this procedure until all cylinders have been tested
  • Compare cylinders compression reading, all readings should be within about 5% of each other
If low compression exists a cylinder malfunction exits and further inspection is required. Possible causes for a low compression condition are: burned intake or exhaust valve, broken piston or piston ring, broken valve spring or a blown head gasket.

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