Small Engine Troubleshooting Problems? Ask a Mechanic Now.
This CH 20 engine? The engine has two coils. and a single kill wire to each coil. Locate the kill wire from keyswitch to coils and remove the wires from the coils and see if you have spark. If you have spark, the kill circuit is grounding out the spark. This engine can also come with the OIL GUARD system , if oil switch grounds the spark, you loose the spark.