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NotTaR of small Gasoline Engines and Rotary Lawn Mowers : Capacitor discharge ignitions systems
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1994-2007, Samuel M. Goldwasser. All Rights Reserved. Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied: 1. This notice is included in its entirety at the beginning. 2. There is no charge except to cover the costs of copying.
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(From: Matthias Meerwein (mmerwei@eis.k8.rt.bosch.de).)
I once fixed a CDI unit for a 3-cylinder Evinrude 2-stroke outboard motor.
The storage capacitor (1 uF, 400VDC) had a short. Quite simple to replace,
but digging the PCB out of the silicone RTV sealing compound inside the
ignition box was a real pain! But considering that Evinrude charges real
big bucks (about 800 DM = 500$) for the ignition box, it was worth the effort.
Another possible cause of failure of the CDI are the SCRs. Also, check the
charging and trigger windings as well as the cables and connections.