r1-z

[tzr-v4]

Maybe -70 CDI version is for "Racing" one like for the others TZR...

[howARD]

Is the racing CDi unable on the road or just for race use, maybe 3XC-70 stands for 70bhp lol.

[tzr-v4]

I think racing CDI is to avoid Japanese road restriction to 45hp or 40hp for late model.
-70 stands for 170hp 

[Yatsushiro]

The 3XC-70 was rare to the point of being almost mythical.

A few years back, they were changing hands for up to £400 on Yahoo Japan. In the last couple of months, I've seen a couple on Yahoo Japan go for between £150 & £260.

From what I understand, there was a 'one make' race series for R1-Z's, with YEC (or Mihara Specialities) CDI's, labelled as 3XC-70.

There's a fair bit of information out there, but as I don't understand Japanese (or entirely trust Google Translate), I've never got to the bottom of precisely what this CDI allows. I believe it provides for higher peak RPM, with overrun.

There is a suspicion that the 3XC-70 is almost identical to the 2XT CDI.