Can CDI cause no spark?
Sometimes, a bad CDI does not cause sparks at all. Again, when a CDI box is about to go bad, it can lead to misfires, issues with starting, rough running or even stall the motor. Therefore, the only way you can tell whether your CDI has a problem is by confirming that everything else is in the right condition.
Can a bad CDI cause weak spark?
Re: reasons for weak spark on CDI system? The COIL can give weak spark in spite of the spark being triggered by a CDI box. If you have an anemic yellowy spark from the plug then I would suggest to check that all of the connections are clean and tight.
How do you diagnose a bad CDI?
CDI Box Troubleshooting
- Misfires.
- Rough running.
- Difficulty starting.
- Other ignition problems.
- Engine stalling.
What should I do if my spark is not working?
Turn the ignition to the On position. DO NOT CRANK THE ENGINE. With a small jumper wire, short the Green and Violet magnetic pickup wires together then pull the jumper off. Each time the short is removed a spark should jump If spark is present, the ignition is working properly. Inspect all of the wiring. Substitute another coil and test again.
How to check for Spark on an ATV?
This is the side with the spark plug caps. If your ignition coil has two spark plug caps, simply put the red test lead in one and the black in the other. Look for around 16k ohms resistance, but again you should check your service manual for your specific measurements.
What should I do if there is no spark on my MSD?
Inspect all of the wiring. Substitute another coil and test again. If there is now spark, the coil is at fault. If there is still no spark, check to make sure there is 12 volts on the small Red wire from the MSD when the key is in the On position.
How can I tell if my spark plug is working?
Turn the ignition to the On position. DO NOT CRANK THE ENGINE. Tap the White wire to ground several times. Each time the wire is pulled away from ground a spark should jump from the coil wire to ground. If spark is present, the ignition is working properly. Inspect all of the wiring. Substitute another coil and test again.