Mine typically just went dead. The M110 engine manual has considerable verbiage on how to test for dwell with the electronic ignition. The black box itself is full of condensers, resistors and contacts--which is why it was a $300 item nearly 40 years ago.

A misfire sounds like faulty plugs, wires, or corrosion on the rotor tip or inside the distributor cap.

Substituting a normal 12V coil and bypassing the box temporarily would determine whether it's the box or some other component


Tim Kraakevik
kraakevik@voyager.net
630 474-9164