First, make sure the wires to the switch/Module are not shorting out the spark. Then check the air gap of the module/rotor(.010-.012).
If no help, then you can remove the rear switch housing,
keeping the wires attached. Make a shorting wire between the spark plug and the transformer. If no spark can be detected then you have either a Module or a Transformer failure.
I stock parts for both current and Vintage HOMELITE models.
VINTAGE HOMELITE * 785-562-3539
SERVICING HOMELITE FOR OVER 50 YEARS
Bill Walcott, February 2008