Quote:
Originally Posted by Jonny H
Had well over 250+ Bosch CDI units through our shop.
Some are quieter than others but genuine 3 and 6 pin Bosch CDI units all squeal / whine when powered.
Easily audible with the ignition on prior to engine running.
(OP, Replica boxes or replacement internals tend not to make a noise)
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Not really! Most likely with those that have loose cores/tape, the result of careless handling. Furthermore, it's also a function of one's hearing ability.
It's like many naive troubleshooting/guessing procedures of little value, another "wives tail" like multiple sparks provide more HP.