Honda NSR -97 , blackbox?

Fenat · L Plate Warrior Joined: 18 Apr 2007 Karma :

Hello

I'm about to try and de-restrict my NSR. I have looked in the air intake and the exhaust pipe and found nothing. Still the motorcycle barley do 110 km/h. I have heard something about a black box somewhere under the tank.

The problem is, i have no clue about what one looks like so i can't check if I have one. So I was wondering if anyone could post a picture of a blackbox?

I checked myself and found this thing, is this the one?
https://i14.tinypic.com/4371579.jpg

There are four cables going in to it. It looks like a gold box, about 2x2x2 cm in volume.
Thanks

demoNSR · Scooby Slapper Joined: 06 Apr 2007 Karma :

Have a look at Alains de-restriction guide. https://www.geneva-racing.com/~alains/NSRtips.doc I am sure there is something in here about the CDI unit for European spec bikes. Assuming yours is a European spec model.
UK spec models have a baffle in the header, and a restrictor behind the carburettor. Idea

Also, have a look at NSR125.com Workshop section. this tells you how to de-restrict a UK spec bike.

Fenat · L Plate Warrior Joined: 18 Apr 2007 Karma :

Well i have checked both of these links before and I don't think they will help. Because at nsr125.com they only show you how to take out the baffle in the header, and a restrictor behind the carburettor. And as I said, I don't have any of those.

About the CDI-unit, thats lokated back at the rear lights if i got it right? The blackbox would be mounted under the fuel tank and restrict the, now i can't find the english word for it, but I think you understand if I say the rpm. My bike only does 7500 rpm.

demoNSR · Scooby Slapper Joined: 06 Apr 2007 Karma :

Alains guide also tells you that you need to make adjustment to the Airbox. This is a black box, about 30x15cm. This is located under the tank also, and the lid/top is held down with 6 screws. You will need to make extra holes in the box to allow more air in. This is explained in Alains guide. But if your bike is European spec, the CDI unit is also restricted, which would explain why you only achieve 7,500rpm. This will only require you to make a break in a connection. But not sure which connection. Hope this helps Idea

Fenat · L Plate Warrior Joined: 18 Apr 2007 Karma :

Oh so that restriction is also in the CDI.

I heard that there was a blackbox, not a "black box". The blackbox, together with the ordinary restrictions, resticts the bike so it only can go in 80km/h in Germany.

But I will check on the CDI unit again, hopefully someone in here knows wich cable to cut.

demoNSR · Scooby Slapper Joined: 06 Apr 2007 Karma :

The jont is a soldered joint on the circuit board, but i am not sure which one. I think this restricts the power valves. but i am sure there is something about it in Alains de-restriction guide. But my bike is UK spec, so i did not take much notice of the procedure, as the CDI on UK spec bikes is not restricted. Once your bike is fully de-restricted, you should reach speeds of around 105-110 mph, or about 150-160 kmh (i think) But you will also need to make extra holes in the Airbox to allow more air in. Thumbs Up

Fenat · L Plate Warrior Joined: 18 Apr 2007 Karma :

Black/white ........ Start key
Red/black ........... CDI charge
green ................. ground
blue ................... Ignition timing
Red/white .......... RC valves timing
Black/yellow ....... Spark+tachometer
Green/white ....... Security stand

I got this from Alains guide. It's not start key, security stand ord ground i suppose. RC valves timing i tried to cut of last summer, no change there. CDI chagre i guess should be plugged in.
That leaves Ignition timing, which i read somethin about some week ago, you think that I should cut it?

Edit: Spark + tachometer I have no clue of what that is.

demoNSR · Scooby Slapper Joined: 06 Apr 2007 Karma :

DON'T cut any wires!!! The join is on the CDI circuit board. It is a bridged joint between 2 points which is soldered. You will need a soldering iron to melt the joint to break it. I just don't know which joint it is. You will have to do some searching to find out which joint needs melting. But i think it controls the power valves. I am sure, somewhere in Alains guide tells you which joint to melt.

Fenat · L Plate Warrior Joined: 18 Apr 2007 Karma :

So you're saying i should open up the CDI-unit and melt away so there's no contact between two points?
I will check Alains guide alittle more careful then.

demoNSR · Scooby Slapper Joined: 06 Apr 2007 Karma :

Yes, there is a bridged joint on the circuit board in the CDI that will need to be broken. This will allow your valves to open fully, (i think). But check the guide to be sure. Smile

Fenat · L Plate Warrior Joined: 18 Apr 2007 Karma :

Yeah. By the way, I just noticed that I had an outdated version of the guide. Alittle more to read now, hehe.

But if i do this, this will make the RC valves open fully? And not make the bike being capable to climb to higher RPM?

demoNSR · Scooby Slapper Joined: 06 Apr 2007 Karma :

This should de-restrict the valves, but what have you done so far? What size front sprocket is on the bike? There may be more than one factor you need to look at before your bike is FULLY de-restricted.
I know for UK spec bikes, you need to remove a baffle from the exhaust intake, remove restriction from behind the carburettor, up-jet the carburettor (new jets), modify the air box and fit a new larger front sprocket. I am also goint to fit an after market exhaust, which should give me a little more power too. and carbon reeds. But you will need to do everything in Alains guide for a European spec NSR to fully de-restrict. He seems to know more about NSR's than anyone else, so it is the best place to look.
My bike is UK spec, so that is what i am concentrating on, and i am no expert, i just pick up tips along the way.
A good idea is to print the whole guide for your particular bike, then you will have it beside you when doing the work. Idea

Fenat · L Plate Warrior Joined: 18 Apr 2007 Karma :

So far I practically haven't done nothing. I have just looked for restrictions. There was no one in the exhaust pipe or in the air intake.
And to be honest, I don't know what size the sprockets are. My guess is that they are the original size.

I dont think I will buy new jets nor a new exhaustpipe, going for a bigger bike in the summer Wink

But for now it would be fun if all my friends didn't drive away from me so easily.

demoNSR · Scooby Slapper Joined: 06 Apr 2007 Karma :

Ah you poor luv Rolling Eyes

You will most likely need a new front sprocket, modify the airbox, and up-jet the carburettor.
New jets are very cheap, about €20 for all 3 needed.
To modify the airbox is free/gratis, if you know what needs to be done.
New front sprocket will be around €60
And of course, de-restrict the CDI.

alains · World Chat Champion Joined: 08 Jul 2004 Karma :

i've just read this post , send me pm with your serial number and i will guide you . waiting that dont make some stupid cutings or modification if you have not understand my guide . but it's important before doing something to know the import country first
your serial number is on a label between the 2 yokes
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