cap10b, I have both types of CH ignitions, one with syncro spark and one without. The both use the same type of Hall effect switch. If Bass1's switch is good it should fire.

On the Brisons that I am familiar with there is a small screw next to the switch. The screw goes in the mount and just grazes the switch plastic which is what holds it in. Remove the screw and pull the switch out to replace it. The CH web site lists the switch. Why not try moving it a little closer to the magnet to see if you get a spark.

I've only had one Hall effect switch go bad in all my years of using these. It happened this past spring at a big bird flyin. I was flying my Brison 5.8 equipped Ziroli Corsair when the engine started missing badly. I landed and started checking it out. Changed the plug. Same miss. I found that a friend had the same trouble about a week before with his plane. I borrowed his spare switch and put it in. Re timed it and the problem was solved. Any time you change one of these switches you have to recheck the timing because it can change. I would have thought the switch would have been solidly good or dead. Not so, there can be an in between state.

Ken