1990 ns125r k HELP Please

gene_cann · Renault 5 Driver Joined: 02 Mar 2004 Karma :

Hi guys just wondering if you could help me my mate said he could de-restrict my bike but he couldn't and he did not put the bike back together i have a manual obtained a copy from scotty with thanks!.

so i can get it back together just wanted to know if you guys know how to de-restrict it as i can only get 65 out of it and my "MATE" has the same bike and can get 90mph out of it and it has not been modified in any way

any help is greatly appreciated Thumbs Up

Regard's

Gene
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NSR125-Kid-UK · Attention Whore Joined: 03 May 2003 Karma :

https://www.nsr125.com/derestrict.htm

This page refers to bikes from 1993 onwards so I'm not sure how much help it could be, but I'd imagine the principles are the same.

I'm afraid that although I own an NSR (125R - 2000) myself, it was derestricted when i bought it so i've not actually carried out the process myself.

In any case, I hope this is of some help to you, although as I say there may be differences in your bike's workings, so i'd wait for further advice before opening your bike up.

Best of luck whatever happens mate. Thumbs Up

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gene_cann · Renault 5 Driver Joined: 02 Mar 2004 Karma :

Hi yeah it looks good but is what there saying remove the exhaust look in there to see how thick the walls are then is the big thing what they say remove that big black box which the tube goes into the engine and thats where the restrictor plate is if so i will do that then could you explain to me about the front sprocket restriction thing please i know this must sound really dumb but i am quite dumb when it comes to bike i don't really know what all the bits are called!LOL Laughing

All help much appreciated!

Cheer's

Gene
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"If your not part of the solution then your part of the problem"

gene_cann · Renault 5 Driver Joined: 02 Mar 2004 Karma :

Hi all

Just a quickie straying away from the other question but still help with it please! Mr. Green

My friend wants to know what is the best type of paint to spray his nsr with??????? also what colour scheme do you think would be cool??

Cheer's

Gene & Martin
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ZaphodBeeble · World Chat Champion Joined: 10 Feb 2004 Karma :

There isn't any restriction on the sprockets on the NSR. For that matter there isn't a restrictor on a sprocket at all. The only way it would be considered as restricted is if the gearing was made lower by having a smaller front sprocket. This does not affect engine power but mainly acceleration and top speed. There is a trade-off you see, if you want higher top speed you must sacrifice acceleration and vice-versa.

As for the exhaust restriction, it will be inside the pipe when you take it off, it shouldn't be inside the engine exhaust port (as far as I know). The other restrictor will be on the opposite side of the engine between the engine head and the carburettor. (Usually a rubber pipe about 2 or 3 inches long.) There will be a plate between that rubber connector and the engine. That can be removed. Be careful not to remove the reed block though as that is an important part of the engine. (It has plastic 'flaps' on it that can be moved.)

Hope this helps Thumbs Up

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Hex · Party Boy Joined: 04 Feb 2002 Karma :

The ns isn't restricted the same way as the nsr. I used to have one and it would do 90ish with an after market system on (came with the bike).

Count the teeth on the sprockets to see if your gearing is the same as your mates. Thats the easiest way to see if your both looking at similar gearing.

I think your problem is probably going to be down to the fact your engine needs its rings changing though. How long ago where they done?
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gene_cann · Renault 5 Driver Joined: 02 Mar 2004 Karma :

what and where are the sprokets????? and rings????

Thanks for your help it is much appreciated

Regards

Gene Cann
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gene_cann · Renault 5 Driver Joined: 02 Mar 2004 Karma :

hi again just taking of the exhaust but one of the alenkey screws i cant get to due the the bend in the exhaust what could i use to get it off??

Thanks for your help it is much appreciated

Regards

Gene Cann
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Ian (GPX) · Brolly Dolly Joined: 05 Aug 2003 Karma :

Huh ?

Why are you trying to take off the can ? Leave the 3 alenkeys alone.

Just undo the bolt that hold it to the rear foot rest and from under the bike too, then undo the 2 nuts at the front of the engine, the zaust will fall off then.

Ian (GPX) · Brolly Dolly Joined: 05 Aug 2003 Karma :

McJamweasel · BCF Junkie Joined: 22 Mar 2002 Karma :

Ian. WTF??

People have to start somewhere - not everyone is born with an intimate knowledge of motorcycle parts, as I assume you were from that comment.
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Ian (GPX) · Brolly Dolly Joined: 05 Aug 2003 Karma :

Ste · Not Work Safe Joined: 01 Sep 2002 Karma :

McJam.

You don't know anything until you are ask and find out, or you look it up. Well, most of us don't. Laughing

Ste · Not Work Safe Joined: 01 Sep 2002 Karma :

McJamweasel · BCF Junkie Joined: 22 Mar 2002 Karma :

Ian (GPX) · Brolly Dolly Joined: 05 Aug 2003 Karma :

Ian (GPX) · Brolly Dolly Joined: 05 Aug 2003 Karma :

gene_cann · Renault 5 Driver Joined: 02 Mar 2004 Karma :

HI dont i have to take the end part of the exhaust off becouse i think the restriction is in the end part?

THANKS for your help it is much appreciated

Regards

Gene Cann
____________________
"If your not part of the solution then your part of the problem"

Ian (GPX) · Brolly Dolly Joined: 05 Aug 2003 Karma :

If your bike is an NS125 and not an NSR125 then no, the restrictor is at the front of the zaust, it's a round ring thats welded into it and has to be drilled and filed out.

Does your bike look like this one ?

https://hayabusa.bikepics.com/honda-nsr125-87-bikepics-073878.jpg

SKIN2537 · L Plate Warrior Joined: 25 Feb 2004 Karma :

Gene...If you get your rings done, please let me know how much it cost. i've just become a NSR owner too. i'm 65 flat out, i reckon i gotta do th exhaust thing and the rest. Thumbs Up

If you've done yours, let me know how you got on.

ilovens125f's · Renault 5 Driver Joined: 20 Sep 2003 Karma :

Hi there is another restriction in the Exaust...
Where it says "HERE" its a collor!!!

Hope this helps

Kev Thumbs Up

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Scooby · Scrappy Doo Joined: 26 Mar 2002 Karma :

Ian (GPX) · Brolly Dolly Joined: 05 Aug 2003 Karma :

Valentino Mossy · World Chat Champion Joined: 13 Jul 2003 Karma :

Derestricted Ns125r are fun when they work ! Silence

Dont ask me on how to rebuild the things ! Laughing

OT
Parts came today Ian !
Whats the last number on the regulator mean ?
My old one says : sh522b-12 0.2
New one : sh522b-12 7.1 Confused

BTW : That photo of the ns, was it yours as its very nice ! Thumbs Up

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Ian (GPX) · Brolly Dolly Joined: 05 Aug 2003 Karma :

Part no..... no idea mate !

Nah, that was not mine, same as mine, mine was all red in colour.

Restrictor in can, depends on the can, mine never had the standard end can, so it did not have one. I had a spare can and that did have the plate in it.