de-restricting zxr 400

Moderator: Moderators

Post Reply
jimbo
Posts: 17
Joined: Tue Feb 09, 2010 2:41 pm
My Bike: zxr 400

de-restricting zxr 400

Post by jimbo »

hi ive just de-restricted my zxr 400 by taking the restrictors out of the carbs,but it still feels like its restricted is there any other restrictors?
cargo
zxr400 oc member
zxr400 oc member
Posts: 3341
Joined: Sat Jan 08, 2005 10:33 am
My Bike: tomos moped
Location: Carrickfergus Northern Ireland

Re: de-restricting zxr 400

Post by cargo »

Is it a UK model or an import
jimbo
Posts: 17
Joined: Tue Feb 09, 2010 2:41 pm
My Bike: zxr 400

Re: de-restricting zxr 400

Post by jimbo »

Its an import
User avatar
extonyg
zxr400 oc member
zxr400 oc member
Posts: 405
Joined: Tue May 12, 2009 9:40 pm
My Bike: zxr 400 L1 uk
Location: Portsmouth

Re: de-restricting zxr 400

Post by extonyg »

if you do a search .........top right corner.............. theres loads of threads about restictions..........smaller 30mm carbs, cdi, speedo
jimbo
Posts: 17
Joined: Tue Feb 09, 2010 2:41 pm
My Bike: zxr 400

Re: de-restricting zxr 400

Post by jimbo »

my cdi has these numbers on it 2119 1394 and its a yellow sticker is it restricted?
cargo
zxr400 oc member
zxr400 oc member
Posts: 3341
Joined: Sat Jan 08, 2005 10:33 am
My Bike: tomos moped
Location: Carrickfergus Northern Ireland

Re: de-restricting zxr 400

Post by cargo »

Easy answer is yes however it could be that somebody has overcome it.

But yes a yellow CDI box is a restriced one.

You should also see a 3 wire lead from your speedo that connects to the loom via a black connecter.

I'll post a photo for you if you like ?
jimbo
Posts: 17
Joined: Tue Feb 09, 2010 2:41 pm
My Bike: zxr 400

Re: de-restricting zxr 400

Post by jimbo »

yes it has,would this effect the acceleration as well as the top speed?
cargo
zxr400 oc member
zxr400 oc member
Posts: 3341
Joined: Sat Jan 08, 2005 10:33 am
My Bike: tomos moped
Location: Carrickfergus Northern Ireland

Re: de-restricting zxr 400

Post by cargo »

OK I'll explain

You have an Import ZXR400 it is restricted..................this restriction takes to form of a speed sensor in the speedo that restricts your top speed I think it's 110mph. This is done voa the 3 wire black connecter sending a signal to the CDI that you bike has reach that preset top speed.

If you unplug the unplug black 3 wire connecter at the speedo the CDI box goes into a default mode and will not allow the bike to rev over 10,000

There are anumber of methods of overcoming the restriction all of which are explain in the various threads on this subject
A quick run through...........................

1. Replace CDI for a blue UK one or

2. Fit an after market deristricter or

3. Connect a 10 ohm resister across two of the wires at the black connecter I think it's the outside two or

4. Open the speedo and bend back the little tab that makes the connection at the preset top speed or

5. disconnect the speedo drive cable (illegal) or

6. Buy a UK ZXR 400
jimbo
Posts: 17
Joined: Tue Feb 09, 2010 2:41 pm
My Bike: zxr 400

Re: de-restricting zxr 400

Post by jimbo »

Mine struggles to hit 85mph? it also has a kph-mph converter fitted
cargo
zxr400 oc member
zxr400 oc member
Posts: 3341
Joined: Sat Jan 08, 2005 10:33 am
My Bike: tomos moped
Location: Carrickfergus Northern Ireland

Re: de-restricting zxr 400

Post by cargo »

Ah maybe it restricted to 110 KPH
jimbo
Posts: 17
Joined: Tue Feb 09, 2010 2:41 pm
My Bike: zxr 400

Re: de-restricting zxr 400

Post by jimbo »

OK thanks for your help i will proberly look into changing the cdi
cargo
zxr400 oc member
zxr400 oc member
Posts: 3341
Joined: Sat Jan 08, 2005 10:33 am
My Bike: tomos moped
Location: Carrickfergus Northern Ireland

Re: de-restricting zxr 400

Post by cargo »

Funny enough I had a CDI problem yesterday.................watch this space
User avatar
Miles
zxr400 oc member
zxr400 oc member
Posts: 498
Joined: Wed Apr 30, 2008 11:00 pm
My Bike: ZXR 400 L3
Location: Bangor, Northern Ireland

Re: de-restricting zxr 400

Post by Miles »

That reminds me cargo I still have two of your CDI's. must get them back to you
zimm
zxr400 oc member
zxr400 oc member
Posts: 2320
Joined: Tue Oct 10, 2006 12:32 am
My Bike: ZXR400-M4, ZX4, ZX6R.
Location: Herefordshire

Re: de-restricting zxr 400

Post by zimm »

to draw this all in to one place as the original thread was locked and i found this on an old thread ..
jimbo wrote:i just brought a uk cdi with the letter L on it whats the top speed?
answer to the above is "same as before" you have a 21119-1331 cdi, blue label, big "L" on it .. just another restricted import ignition

you want a 21119-1332, blue label, big "M" on it.


however.. if its fit the bike should pull over 85 whatever ignition is fitted.

kph or mph clocks ?

check it hasnt had tiny jets fitted when it was restricted, and that the air filter/airbox assembly is complete and in good condition.
jimbo
Posts: 17
Joined: Tue Feb 09, 2010 2:41 pm
My Bike: zxr 400

Re: de-restricting zxr 400

Post by jimbo »

hi if my down pipes are blowing a bit would that be the cause of my problem
Post Reply