My NC30 has a spluttery misfire/flat spot around 6000 rpm, I suspected fuelling but unplugging the POSH FIRM box seems to have cured it.

Is this box a delimiter and are they known for problems.

Back in the day I used to knock up a basic PCB to plug in instead of the speedo sensor that told the cdi that it was always travelling below 112mph. I used this on ZXRs and FZRs but never a Honda - anyone else used this method?

Yeah, the de-restrictor box can be home made with a 5p resistor, use the search function and look for resistor mod.

you can also open the speedo and bend the tab out of the way.

as described here...

http://www.vsource.org/VFR-RVF_files/NC ... iction.htm" onclick="window.open(this.href);return false;