NC30 Speedo Changeover

[Peter.H]

I have a set of UK clocks for my NC that I inherited from a previous bike I bought in bits. Tried to swap them with the standard KM clocks and stumbled across one cable that goes in to the rear on the top right of the speedo that is on the Jap clocks but not the UK ones. Does anyone know what it does / ability to switch it to the UK clocks?

Any help is welcomed and appreciated.


UK Clocks the gap is where the rubber bung is


By my index finger

[richyrd5]

Probably a resistor mod/deristricting device??looks like the clock light though???

[Peter.H]

The cable bottom right of this picture I got from eBay

[Peter.H]

Think you may well be right - is anyone able to confirm?

[richyrd5]

That's the main clock loom..

[Peter.H]

Any way of changing it over?

[Neosophist]

you mean a small cable with a 3 pin plug on it?

thatll be your JDM speedo restriction ciruit.

If the bikes 180km/h restirctor hasnt already been bypassed then if you dont re-connect that 3 pin plug up then the bike will missfire over 5500 rpm.

from your description im 99% sure your talking abotu the speed restirctor (uk clocks never had it)

just leave it be, but if you get the miss-fire you will have to disable the speed limiter, you can do this at the cdi end by splicing two wires togheter (blue /orange / black/white) scothlock type connector on the two will do it.

[JZH]

Do you mean the speed warning light? Not all J-spec NC30s had it, just the 2J and 4J models, which I think were only sold in certain perfectures in Japan. I have the Japanese-language workshop manual for the NC30, and there are two wiring diagrams--one showing the warning light and the other not.

VFR400R J2-J4 Wiring Diagram (partial).PDF

Ciao,

[Neosophist]

Do you mean the speed warning light? Not all J-spec NC30s had it, just the 2J and 4J models, which I think were only sold in certain perfectures in Japan. I have the Japanese-language workshop manual for the NC30, and there are two wiring diagrams--one showing the warning light and the other not.

VFR400R J2-J4 Wiring Diagram (partial).PDF

Ciao,

not sure if this speed warning lamp bike was ever sold anywhere... 80km/h motorcycle speed limit was dropped nationally in 1988 and from 1989 a mandatory speed limiter of 180km/h was enforced.. hence the 1989 bikes starting with nc30 having limiter and no warning light, unlike the nc21/24 of previous generation that had an 80km/h overspeed light but no top end limiter.

that wiring diagram does show a 4 pin speed lmiiter plug instead of a 3 pin one with an added warning light as well as the tradition blue/orange speed limiter.

could be some out there but ive never seen one and never come across anyone with a blog post about them.

just seems odd.. perhaps they were training bikes or some other special purpose bikes.. i dont think they were road bikes. ill see if i can dig some more info out.

As for the op. if you look at the pictures he posted youw ill see that the uk clocks have nothing coming out of the speedo part (they had no speed sensor in them) and the JDM clocks do.

probably just the traditional 3 pin speed limiter that can be bypassed as per my original post.