can someone identify this???

[chuckles78]

You were a long way from home when you saw me cruising up the m4 just outside st mellons the other weekend then thunderace lol...

[Velociraptor]

I have in my possession a derestrictor with HRC logo on it. I dont know if its really an HRC thing, or just a copy of the logo from another manufacturer...

But the thing is ...guess what the derestrictor does... It just rewires the loom, just like the way I proposed above. And it doesn't even include a resistor... All in the box is just a re-wiring of the two wires I allready wrote.

I used a multimeter and made a reverse engineering to know this...

Anyway, the logic of the restrictor is this, the orange-blue wire comes from the speedometer, and has two states 12V which means ''under 180kmh'' and 0V which means ''above 180kmh''.

When the ECU reads 12V from the orange-blue wire, all goes well, but when it gets 0V, it goes ''kill ignition until rpm goes under 5000rpm OR signal goes 12V, whichever comes first''

Thats why removing the speedometer, the bike goes 5000rpm max. Removing the speedometer=>removing the restrictor sensor=>0V goes to the ECU=>ECU goes ''kill ignition above 5000rpm''

Same happens if you also replace the speedometer with Koso meter, 0V goes permanently to the orange-blue wire, since the KOSO meter ignores it...

If you do the rewiring I propose, 12V goes permanently to the ECU => ECU goes all well permanently , and that applies whatever you do at the meters.

I suppose your derestrictor does the exact same thing... so using your derestrictor will have the exact same effect with the rewiring I propose, except of course the disadvantage of an extra box around there...

I hope I helped a bit... just do the rewiring and the NC30 will work always OK regardless what u do to the meters.

[Cammo]

I've always just rewired as you say velociraptor, never bothered with a resistor.

Chuckles: Plug the derestrictor in to the cdi - it will remove the 180 km/h speed restriction and allow you to remove the standard clocks and all will be fine.

[Neosophist]

Or just fit a UK speedo, or remove the contacts inside the kph one

A UK speedo by itself wont delimit a Japanese bike, it will actually trip the limit circuit as there is no circuitary inside the UK clocks to plug into the Japanese loom.

I have in my possession a derestrictor with HRC logo on it. I dont know if its really an HRC thing, or just a copy of the logo from another manufacturer...

But the thing is ...guess what the derestrictor does... It just rewires the loom, just like the way I proposed above. And it doesn't even include a resistor... All in the box is just a re-wiring of the two wires I allready wrote.

And yes.. the HRC SP Unit (delimit box) has nothing inside it but it connects the wire mentioned to 12v.

I have a photo soemwhere of one cut in half.

To the OP.

Maybe it wasn't clear in my original post but yes, if that is a normal restriction box then it will allow you to do whtever. I cant tell the make of it from that picture but it sure looks like a resitrciton removing box.

You can just remove the speedo.

The method you mention about leaving the circuitboard from the speedo in a ziplock bag is for those people who do not wish to fit a de-resriction box or rewire the bike.

[speedy231278]

your all mis-understanding me guys I know this will derestrict the bike thats why i bought it lol...

I missed this bit. Are you assuming that by 'derestricting' the bike you're going to get lots more power and torque, or at least a better spread? If so, you are going to be disappointed as no-one has found conclusive evidence of such a phenomenon occurring. The only change you will see are is the end to the speed limiter. I believe that only the HRC ignition does anything whatsoever to alter any of the characteristics of the way the bike runs, the most significant allegedly being an extra 1000rpm and maintaining full advance on the ignition until the rev limiter cuts in. However, in order to make use of this, you need to be running other race kit stuff like a full exhaust system, modified carbs, ported heads, reprofiled cams, etc. A standard engine is simply built to produce circa 60bhp, and isn't restricted in the sense that it has had the power capped by being significantly limited by the carbs, ignition, exhaust or whatever. You can bolt a small number of BHPs on to the bike, but probably count them on one hand without lots of very expensive work.

Interestingly enough, a short time ago someone actually decided to do a proper study on the subject, and arranged a dyno session with both an NC30 and 35 to test stock, HRC and an aftermarket race ignitions back to back on the same bikes to see what difference it made. Very, very little, and in fact it most runs with the stock ignition produced more power! The differences were very small to the point that even if you were on a racetrack you'd have to be some of god to notice the fractional difference!

[chuckles78]

Thanks raptor thats exactly what I needed to know and also I dont know what make it is either I bought it off flea bay... I was using a motrax speedo convertor to take away the speed limiter but it has all gone pear shaped so fed up of buying them at 25 quid a pop when the gauges are the only thing that stand out from modern day machines so decided to save money and fit the koso gauge but if I ever sell the bike I will supply original parts with it..
May I ask you to describe to me how to wire a relay on my bike to safely run h4 55w xenon bulbs without affecting my switchgear as you really know your stuff with the wiring cheers mate... a very grateful Anthony

[chuckles78]

Thanks for the info speedy but I did actually mean the speed limiter jdm market crap 112 m.p.h restriction but the info you gave is good to know saves spending a lot of money trying to acheive the impossible and getting ripped off by lying b**tards on flea bay... many thanks for that here is my bike guys..

Notice the personalisation on the tail lol..(I am a rossi fan really)

[speedy231278]

More horsepower isn't impossible, it's just not as simple as plugging in a little box of tricks and bolting on a noisy can! :-)

[chuckles78]

dont really want to go down the road of porting and polishing, profiling cams etc as I am gonna get a gixxer 750 for more horsepower but didnt expect to fall in love with my first big bike gonna find it hard to part with it...

[tmjns796]

Don't part with it! save up and buy the Gsxr as well :-D keep the NC30 for a toy, for the heads of the valleys!