how do i de restrict my nsr 125

smythm · L Plate Warrior Joined: 07 Jun 2005 Karma :

how do i do it and is it easy to do and will it damage my bike

kingsknight · World Chat Champion Joined: 21 Jun 2003 Karma :

www.nsr125.com for all your NSR needs my friend And i believe it will damage your bike in the long run but you will have a good time on the way Wink

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carful_16 · Two Stroke Sniffer Joined: 05 Jan 2007 Karma :

0ddball · World Chat Champion Joined: 15 Jul 2005 Karma :

Derestricting it is simply letting it work as the manufacturer designed it to work. It's not overstressing the engine or anything.

The only reason they are sold restricted in this country is to comply with the licencing laws.

carful_16 · Two Stroke Sniffer Joined: 05 Jan 2007 Karma :

Thanks man ! truly appreciated

Finglonga · World Chat Champion Joined: 27 Jul 2004 Karma :

But too many people don't know what they are doing and only do half a job or try to squeeze the last once of power out of the small engine.....In the end it will go pop. Wink

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

depense on your serial number (between the yokes & begin by ZDCJC22..... if it's 1993 and later) , because it depense on the country make and the year , if you want a guide give it to me . have a look here https://www.geneva-racing.com/~alains/NSRtips.doc
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ncrn · World Chat Champion Joined: 24 May 2006 Karma :

you also need to rejet the carbs don't you? Tis the only reason I haven't done mine yet I can't seem to locate the jets I need..
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alains · World Chat Champion Joined: 08 Jul 2004 Karma :

a quick search here should have give you the solution . however the recommanded jets are : main 138 , slow (idle) 42 , power 65
https://www.dellorto.co.uk carb is 28PHBH/FD (1993 & later) or 28PHBH/FS (1989-1992)
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ncrn · World Chat Champion Joined: 24 May 2006 Karma :

Wafer_Thin_Ham · Super Spammer Joined: 18 Nov 2005 Karma :

Isn't it a restrictor welded into the exhaust and a plate in the airbox?? Just take those out and re-jet. Don't be surprised for it to go bang though, NSR's can be quite fragile once de-restricted.
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alains · World Chat Champion Joined: 08 Jul 2004 Karma :

the plate is not in the airbox but between carb and reed block and i do know a bike which is running with . the best de-restriction on UK or IT bikes is a race pipe . also french , swiss & german import have special restrictions , this is why serial number is important . i think you have a lot more to learn on NSR's
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rpg · Scooby Slapper Joined: 08 Jun 2005 Karma :

Alains-do all of the PHBH28 carbs have a powerjet?
thanks.

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

yes for the 28 on NSR's , i am not sure about the 26 (NS125R) but matt cooper at dellorto will tell you
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Marci · Brolly Dolly Joined: 01 Sep 2005 Karma :

Definitely powerjet on my old NS125R-K with 26mm D'O carb...
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rpg · Scooby Slapper Joined: 08 Jun 2005 Karma :

Thanks Alains and Marci Smile