Please explain 3tj 1990 restriction

[MarkT]

You have probably seen my posts about my troubles with my fzr not running well. Reading through the forum I still do not understand how this was done.
Speedo seems one place so when it reachs 180 mph.
Previous owner said he took the speedo apart and turned a disk upside down so the needle would not hit the restrictor pin? I though that I read that the speedo had to hit a sensor at ignition on so it would ready the cdi for riding? Is this wrong and maybe explain the bad running?

Also is the 3tj cdi restictied also or does it just react to the speedo signals.

Please explain what needs to be done to deristrct properly so I know at least that has been done properly and do I need to buy a magic box or anything? I need to learn as much as I can about this bike as I could have it for some time!

Thank you for any information
Mark

[Evilchicken0]

I ssume the person you bought it off also took out the exup and told you it goes really well because of it ... he's wrong.

If everything's standard the CDI resticts the bikes revs so it doesn't exceed 180kmh.
The bike needs to recieve a signal from the speedo at 0kmh when the ignition is turned on, or it will restrict to 12,500 rpm in every gear. (turning the disc over will cause that to happen).
If the bike's speedo is at 0kmh it will restrict to 12,500 rpm in every gear so when your dynoing a jap bike the speedo needs to be spinning for it to rev out.
180kmh is 112mph so really derestricting it is only going to affect you on a private road or track day.

There are 3 ways to derestrict the bike

1. Use a KMH to MPH converter they screw between the bottom of the speedo and the speedo drive and move the restriction from 180kmh to 180MPH so you never hit the restriction. They're useful because your speedo now reads MPH so your less likely to get a speeding ticket. You need a GOLD coloured one, the blue one don't allow the speedo cable to be plugged in. (£30 and mph converted speedo)

2. You get a derestriction box that plugs into the loom. Look behind the speedo and you'll see 3 wires coming out unplug them and plug the box into the loom. Good if your bikes on a dyno or you don't have a speedo like a track bike. (£30 kmh speedo)

3. Have your CDI doctored Like the derestriction box only cleaner and you can remove the wiring so it's good for race bikes (£50 I think from somebody on here).

Because your speedo has been messed with I don't know if you can put it back .... if you can then go for option 1 if you can't the 2 or 3 is better.

[MarkT]

You are so right, thank you so much for your help as you have replied to a lot of my posts! Where can I get this gold mph converter as I will take the speedo out and turn the plate back around! Have no idea how to remove speedo if anyone has any pointers! I must admit when it hits the magic five thou revs it takes off like a rocket!
As for the other ways to deristrict to save me possibly buggering the speedo where can I get the parts of the other options you mention especially the thing you put on the speedo!

Thanks so much
Mark

[Evilchicken0]

After you've been on the forum for a while you'll find a lot of the questions come around again

Mechanical converter - offer £30 but wait and see if you can repair the speedo first.
http://www.ebay.co.uk/itm/MECHANICAL-KI ... 588eda3570

The plug in type are harder to find, I'd probably have the CDI done.

To get to the speedo - take the fairing lowers off then the fairing inserts at the top (where the reserve switch lives) then on the inside of the top fairing there are 4 nuts holding that on. The lights share the same mounts. now you can see the clocks and speedo.

[MarkT]

Thank you so much, a true. Friend! I think I would rather take the cdi route as I am a bit worried aboiut buggering the speedo if I take it apart ! Can you remember where I can get it done or at least where to look?
Cheers mark

[Taggyd]

was it bendy on here who did them?

[Evilchicken0]

Yes that's right it was bendy.

[MarkT]

Where are you bendy ?

[MarkT]

Didn't realise sidestand switch had to be isolated as well? Wondered why my cable had been cut!