CDI Repair

Sometimes an older motorcycle or in this case my tractors CDI will fail, and you will have no spark.

A short term trick to get the CDI to work when this happens, is to heat the whole CDI box with a hot air gun so it's hot to the touch, or apply pressure to the broadsides of the box. These two two short term fixes work by forcing failing contact points of cold solder and components back together but it is temporary and makes the engine unreliable for starting.

If you find yourself at this point, like me, you have some choices to make. Either see how long you can go with just heating up the CDI box or clamping it, or shucking out $$ and just buying a new CDI box.

In this video, I am showing a complete repair that will last for many years to a failing CDI box for my Honda 5518 tractor. I have used this same method in the past for "old" motorcycle CDI's and the majority of the time it works - though is not foolproof.

If you are sure your CDI is the culprit for unreliable or no spark, you have some basic soldering skills, have good vision, have about an hour to kill, and want to save yourself some money, you might want to try my fix. Enjoy!

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