Hi everyone,
I m new here, i have a CB1 model 1990. My CDI unit have some problem with rpm output (dead rpm line), so that i searched around ebay then found some racing CDI units: a superchips CDI unit (with UK flag) and EK2 HRC cdi.
Both of it from CBR400RR 1991.
I know that my CB1 and CBR400RR have same machine type (NC27 vs NC29)

When i plug they on my CB1, EK2 doesn't work, but Superchips CDI works. However, the bike have a limit sound when reaching 5000rpm.

Can u help me about this problem ? Or can u send me a CDI's diagram of them ?

To use the EK2 cdi you need to move one of the pins in the CDi see these threads:

viewtopic.php?f=28&t=11172&start=10

viewtopic.php?f=28&t=15056

Thank for your help

This is it image :


Is it any different between CDI of NC23 & NC29 ? I m using CB1 (NC27), that some people said its CDI is similiar with NC23

I need some pictures about wire's color of the connecting pins on CBR400RR CDI, could u help me ?

I think I have one on the computer at home but I won't be back for a couple of weeks as we are getting work done to the house. I will look them