NSR125R French model derestricting

[Gaz86]

Hi,

I have a yr 2000 Honda NSR125R French import that I would like to fully derestrict. When I purchased it I found that there was no restriction in the exhaust.

Rather than having to spend several hundreds of pounds changing the cdi unit to a CI639 and TV-124 and changing the jetting from standard. 132main, 60 power and 40 idle to 138main, 65 power and 42 idle, is it possible to "cheat" by disconnecting the servo motor and then fully open the power valve and then pin it open?

Thanks,

Gareth

[spitfire123]

[spitfire123]

[alains]

gareth download my file https://www.geneva-racing.ch/~alains/NSRtips.doc
read it closely and you will find all yours answers about derestricting your bike
my bike is a 1998 french so i know what i am talking about !
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the worst day fishing is better than the best day working

[Gaz86]

Thanks for your advice. Much appreciated.

Cheers,

Gareth

[Gaz86]

Cheers Luke. Appreciate your help.

-Gareth

[Gaz86]

Hi,

I am going to de restricte my NSR125R (French model) yr 2000 but need the following parts.

Powervalve controller TV78

CDI unit (CI626)

I got sent what a breaker told me over the phone were the correct parts but this morning to my horror it turned out he had sent me what I already have which is Powervalve controller TV124 and CDI unit CI639.

If anyone could help me out that would be great. I already have the change of jets required.

Am willing to pay up to £80 for the pair. I paid £75 inc P&P for the wrong parts! If you are local to me, South Bucks, (Wycombe area) or even West London I will come and pick up the bits tomorrow if possbile as I was hoping to carry out the work this weekend.
My number is 07968351944.

Thanks,

Gareth

[alains]

i called you but you were out and i dont live you a message . send those units back top your breaker , because they are not the units needed . you need TV78 & CI626 (not CI626A which equal to CI639) . the average price is £100 for both
dont forget if you change CDI you MUST cross black/yellow and green at the 4 wires connector !
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the worst day fishing is better than the best day working

[Gaz86]

Hi Alain

Thanks for your reply. Sorry I didnt pick up your call. Have sent those wrong bits backs and have now ordered what I have been assured are the correct bits, (TV78 and CI626.)

With regards to the crossing the wires when changing the CDI unit is this all explained in your document that I downloaded?

Cheers,

Gareth

[alains]

yes it is
the chart shows you the status of the connections
look CI639 connections and compare with your's , i assume they are identical
if you look , now , the CI626 connections you'll see that b/y and grren are crossed
if you fit a CI626 you mus have the right order of wiring , otherwise the primary coil discharge will be in the reverse way and this ,after less than 5 hours running the bike,will destroy the thyristor door . a thyristor (or triac) act as a closed diode and when you introduce a tiny amperage (by the timming coil) the diode will let the voltage going through . i will make you a simple diagram to show
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the worst day fishing is better than the best day working

[Gaz86]

Will look forward to receiving the diagrams.

Thanks again for all your help.

[Noxious89123]

I think alains must have an NSR fetish or something...

How the hell does he know so much about NSR's?!


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'06 Honda CBR125RW-6 ~ '00 Honda CBR600F-Y ~ '07 Honda CBR600RR-7 ~ Bikeless
'53 Ford Ka 1.3 ~ '03 Vauxhall Astra SRi 1.8 ~ '52 Vauxhall Astra SRi 2.2 ~ '53 Vauxhall Astra GSi

[alains]

since my first mopet in 1957 (it was a blue mobylette) any bike bought was with the workshop manual to learn and pratice any mechanic on my bike . i was fomatted in the air force as electro-technician with a degree of sub-ingeneer , so any electrics on car and bikes was part of my job . the best thing in the air force is that you benefit of a formation continue , so with the electonics growing ...........................
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the worst day fishing is better than the best day working

[M1ke]

...

[Gaz86]

Hi Alain,

Do you think you could send me that wirring diagram today?

Thanks,

Gareth

[alains]

my file : https://www.geneva-racing.ch/~alains/NSRtips.doc
wiring diagram :
1989-1992 https://www.geneva-racing.ch/~alains/schema_R.jpg
1993-2001 https://www.geneva-racing.ch/~alains/NSR125R.jpg
sorry but the foxeye model is in french , if you need translation of something , let me know
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the worst day fishing is better than the best day working

[Gaz86]

Hi Allain

Ok then over the weekend I changed the CDI unit and powervalve control unit from French spec to British spec. (CI626 and TV78) and also changed the jets. Your instructions were easy to follow and luckily my friend who was helping me with the rerestriciton is half Swss French so we managed to wire the CDI unit up as specified.

However though my acceleration is noteably faster, (though I did think there would be a better powerband at 7000rpm) it still wont go any faster than 80mph!

Could this be due to a restriction in the exhaust? Would racing reeds help or a hotter running spark plug?

Hoping you can help?

Thanks,

Gareth

[alains]

of course a race pipe will increase the power by 2-3 Bhp depense on the made . carbon reeds will ease the engine filling in mixture and give extra revs in the 10500-11000 zone
also a BR9EIX plug will give you a better ignition and consequently spare a bit of fuel plus a smoother engine
about your top speed , it's perhaps a wrong set of sprockets
tell me how many tooth in front & rear
then make a test :
- take a run after 7-8 minutes warming and note your max rpm in 4th,5th & 6th gear
- back home , unplug the servo-motor and with multipliers turn the servo pulley as far as you can on HI (probably it will pass the mark)
- take an other run and note again max rpm in 4-5-6 gear
- back home re-plug your servo
then report the results
here for the reeds (i have those on mine) https://cgi.ebay.de/JOllify-Carbon-Membrane-fuer-Honda-NSR-125-JC22-036_W0QQitemZ160327874271QQcmdZViewItemQQptZMotorrad_Kraftradteile?hash=item160327874271&_trksid=p4634.c0.m14.l1262&_trkparms=%7C301%3A1%7C293%3A1%7C294%3A30
here for the plug https://www.sparkplugs.co.uk
i saw that in EBAY UK
https://cgi.ebay.co.uk/HONDA-NSR-125-FOXEYE-ARROW-EXHAUST_W0QQitemZ170328116241QQcmdZViewItemQQptZUK_Motorcycle_Parts?hash=item170328116241&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A10%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50
i think you can go until 120quids
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the worst day fishing is better than the best day working

[Gaz86]

Thank for your help Alain,

I will let you know how I get on.

Cheers,

Gareth

[Gaz86]

Hi Alain,

I dont really feel competant enough disconecting the powervalve etc. However I have ordered some racing reeds which I should receive later this week in time to fit on Saturday morning. I understand they will just improve aceleration rather than top speed? Will they give me more a powerband at all over 7000rpm?

One final thing I'm sure there is a restriction still in the exhaust which is limiting the aceleration and top speed. Also I cant really hit the red line even in 1st and 2nd gear. A friend of mine has a derestricted tzr125 and in 1st and 2 gears he can easilly reach and if your not careful go into the red line!

Any suggestions?

Thanks,

Gareth

[alains]

disconnecting the servo-motor is quite easy , just unplug the connector . when your tank is lifted on it's stand , you see the servo with the pulley . a cubic box is on the left of the tray , open it and following the servo loom look which connector it is and just unplug (see joined pict)
i am sure that your problem is a valves openning fault
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the worst day fishing is better than the best day working

[Gaz86]

Hi Alain,

Ok thanks will give it a try then. I thought as I have now got fitted the English CDI unit and powervalve unit rather than the restricted French ones I wouldnt have any issues with the powervalve opening to about 85-90%?

What benefits should I get from the racing reeds?

Thanks again.

-Gareth

[alains]

better filling of the engine and a better resonance at high revs . the engine is smoother and accelerations are more linear
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the worst day fishing is better than the best day working

[Gaz86]

Hi,

My NSR 125 (yr 2000) is running like a bag of nails!

It wont rev past 5000rpm, it wont tick over, after running for a couple of minutes it clogs up the plug. I have cleaned out the exhaust and drained the two stroke oil, (was using Esso fully synthetic) now using "rock oil"

Still no joy! A friend suggested I change the head gasket, so we are going to do that tonight as well as clean the top end. Does anyone know what the torque settings for the nuts/bolts should be at all?

Thanks

Gareth

[alains]

if you are going to change the gasket , i suggest you change rings , piston pin , clips, small end bearing , base cylinder seal , oil seal (RC/valves)
about 1 hour more but you'll start on a good basis . all spares will cost less than £50 and are stocked by david silver spares
here is you torque chart
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the worst day fishing is better than the best day working