Small Engine Troubleshooting Problems? Ask a Mechanic Now.
What are the readings you get on the coil?
The primary winding should read 2.9 - 3.6 ohms, and the secondary winding should read 14,500 - 19,800 ohms.
If this is good, the problem is most likely in the electronic ignition module. Fortunately, it is very easy to test with a voltmeter.
Disconnect the spark plug wires. Disconnect the red and black ignition module wires from the terminals of the coil. Run a 12V jumper to the red wire. Set your meter to VDC and connect the negative lead to a good ground. Connect the positive lead to the black wire coming from the ignition module. Slowly turn the engine over by hand. The meter should read 12V for 1/2 revolution and drop to about 1V for the other half revolution. Turn the motor through at least 3 full revolutions.