1998 sportsman 500 No spark - ATVConnection.com ATV Enthusiast Community

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Old 03-17-2004, 08:35 PM
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Default 1998 sportsman 500 No spark

I have no ignition spark,can any body point me in the direction to start looking for the cause?
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Old 03-17-2004, 11:04 PM
Pro Rider
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Default 1998 sportsman 500 No spark

Do you have a service manual for the quad? It is a very useful tool, especially in this circumstance.

The no spark instance is a very complicated means of testing - check the simple stuff first - - are you checking for spark with a new plug? Are there any obvious broken/torn wires? Have you shorted anything out?

Then you can get into component testing -
does the coil ohm out within specs? (primary - terminal on coil where blue/white wire connects to coil ground = 0.3 ohms) (secondary - spark plug cap removed - resistance from end of wire to coil ground = 6.3K ohms)
Then exciter and trigger coils - wires coming out of engine unplugged and measure resistance (on engine side connector) across:
red to green = 3.2 ohms (98 model)
black/red to green = 446 ohms

If these components are OK, then you most likely have a defective CDI module.

Hope this helps.
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