NaFe Posted 5January, 2023 Report Share Posted 5January, 2023 Searching a CDI box for 911 SC 1981 engine (preferrably Melbourne) and depending on what the going rate is these days Following some tuning yesterday after my rebuild I went to start the engine this morning and the engine wouldnt fire. Conclusion is that I need a replacement CDI box Fuel, but no spark. 1. I tested the red 15 live wire to the CDI box and was reading 12.4V 2. I measured resistance between 7and 31d and no measurement. 3. cranking the engine, I had no spark from HD lead. 4. ignition on, I had near no voltage at coil (either terminal - white, not brown) 5. I opened up the back of the CDI box and this is what I found: In hind sight, on a couple of instances the tacho dropped its signal, which a bit of research seems to be a symptom of a CDI box on its was out? Quote Link to comment Share on other sites More sharing options...
NaFe Posted 6January, 2023 Author Report Share Posted 6January, 2023 Problem resolved. You can just about see the break in the "wire" on pin 31/1 to the PCB board. Cheers tk111, 81SC and Peter M 3 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.