speedo/speed restriction

[badbannedbiker]

if I disconnect my speedo, do i still have the 112mph top speed restriction? I know if I disconnect the rev counter the bike doesn't work but I can bypass that.

Cheers

[leopard_pagan]

turning the bike in to a track day tool?
if your talking about just unscrewing the speedo cable from the speedo.. the restriction will remain "bypassed" as the wiring is still pluged in to the ECU/CDI sending "i'm still here" signals.
if you remove the whole speedo from the dash, you will render your bike useless past 30mph/5,000rpm.

you can fit a small by-pass MOD and remove the speedo from the dash.
you can make one your self.. or buy a pre-made kit. both come with instructions on how to fit etc.
ebay Item number: 190332964737

or PM me for the free DIY instructions.

[Mikiboy]

I have the plug in derestrictor for sale . Genuine Jap mod bought in Japan for the 23rr

[Cammo]

if I disconnect my speedo, do i still have the 112mph top speed restriction?

If you unscrew the speedo cable: No.

[petrolhead19]

on my nc23 all i have is 2 wires going into back of my speedo bullet connectors and thats my restrictor if yours is same just unplug them lol thats all ive done :D does the job

[leopard_pagan]

"if yours is same just unplug them lol thats all ive done :D does the job"
>>> are you sure about that m8? a 1989 NC23 and all NC29s if you unplug that from the loom with out anything else plugged in to the loom (by-pass mod), the bike will NOT rev past 5,000RPM... end of chat, do not pass go or collect your $200.
earlier NC23s i cant comment on as i know they dont have a limiter.. just a red light that pops on when you go over 112mph.. not a bit of black tape wont cure!

[petrolhead19]

yeah im pretty certain bud it was limited when i got it and got told its an electronic switch or something inside the speedo and i just unplugged it and its fine now plots on to full speed no problem and revs all the way up fine, so bit wierd then? lol

[leopard_pagan]

inside the speedo is a lig/beam trap switch. a disk attached to the needle inside the speedo cuts the beam at 112mph.
what then happens is a signal is lost/stopped to the bikes CDI unit telling it to cut power to two spark plugs. this signal will continue to be cut all the while you try to go over 112mph. once you drop under it, the signal resumes and the CDI powers all 4 plugs again.
Some times bikes have hic-ups with the limiter. this is often caused by bad by-pass wiring, loose wires or more commonly the fuse for the *dash*, indicators, lights has blown.
when this happens the CDI no longer receives the "i'm here doing my job" signal and automatically shuts down two spark plugs as soon as the bike revs over 5,500 RPM.

there are a few by-passes:
1) remove the disk from inside the speedo so nothing cuts the beam, leave sensor plugged in to loom.
2) fit a Resistor by-pass in the main loom behind the dash, unplug speedo from loom.
3) fit resistor by-pass next to the CDI unit, unplug the speedo from the loom. *cant have the 2 working against each other*
4) if you have KPH reading speedo, fit a manual KPH to MPH converter. your bike will NEVER get to 180Mph where the limiter to send the signal now sits!!
5) a few Ozzy racers have a bodge where they cut and re-wire the CDI limiter wires together...
6) a HRC CDI unit has been fitted....

petrolhead19, i believe you may have number 3, 4,5 or 6 on your bike to allow you to unplug the speedo from the main loom and rev over 5.5K rpm.

[petrolhead19]

yeah that kinda makes sense now :D thanks
i never understood how i could just unplug the limiter and it was alright lol.

Thanks :D its all a learning curve at the end of the day lol need to know these things for my mechanics course :)

[missinNZ]

been away for a while, but whats about this subject going in as a sticky to save poor LP from typing it out every time? or do you have it pre typed and use cut n paste?