Ask the Editors: CDI Testing
CDI readings range for the Xpress.
Dear ATVC: I have a Polaris 300 Xpress making no spark. The coil and stator readings are all within limits but I can’t find anywhere what the resistance readings for the CDI should come in around. Will someone please tell me what those reading should be? Thanks in advance.
Your diagnostic process of elimination is spot on. Fortunately, testing the CDI box should prove even more painless than getting a reading from the stator.
Detach and remove the CDI box so that you can test its internal circuitry separate from the rest of the ATV’s electrical system.
Grab your multimeter, set it to measure resistance in Ohms and place a probe on each side of the CDI’s terminal plug to complete the circuit.
There can be a bit of variance in what you measure here but typically between 0.5 and 2 Ohms means the unit is functioning internally as it should. If you get a reading outside of this range, you’ve found the culprit.
