nsr 125 de-restriction

[ukscoobydog]

hi all can u help plz?

i have a nsr 125 2001 uk spec bike and about to de-restrict it what would be the best make of exhaust?

and would it be safe to use the bike if i left the orignal exhaust on but took out the intake restrictor?

thank for all ur help :)

[Flip]

Don't know about a new exhaust, you'll have to search. But yes it's safe to do the exhaust, everyone does.

www.nsr125.com Theres a guide there mate

[ukscoobydog]

cheers flip will have a look :)

[Flip]

I took the intake resrictor out and left the exhaust alone. Gave it a boost acceleration wise but not top end

[ukscoobydog]

thanks flip may take it out this weekend:)

[alains]

best exhaust system is jollymoto 402CARB , contact Ronnie Amighetti : info@jollymoto.it
no picture on the site but i've got one and i bought 5 others for my mates who are fully satisfied : good sound , nice looking , full power the cost is around £220
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the worst day fishing is better than the best day working

[inthetuck]

I Read up on how to derestrict my 2000 NSR125 but im concerned that it will decrease the engine life and increase the risk of a blow out. am i right or jus bein paranoid.

[alains]

i will think about the second option . the nsr works better in high revs . the crankshaft has been tested at 15000 revs for 36 hours with less than 0.5% broken . about barrel & piston the only thing to avoid is a too poor mixture . do not worry too much it's a very reliable bike if you take care of it .
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the worst day fishing is better than the best day working

[alains]

about de-restricting the exhaust . if the restrictor is at the begining of the exhaust (cylinder exit) it's easy to take it off , but some bikes have the restrictor about 8 inches inside the pipe . take a lenght of iron wire (or strong cuper) , take off the exhaust , introduce the wire in the pipe (cylinder side) if you are stopped after 8 inches (or about) you've got the restrictor . mark the length and take the wire off , report the length outside and mark it . you will know cut the pipe as vertical as possible (use a steel saw , not disc) , prior cutting make an horizontal mark which will be use to put later the 2 pieces on line . after cutting you will see the restrictor and with pliers take it off . put the 2 pieces on line (with the mark) and solder it with oxyacethylenic torch and soft steel , never with electric .
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the worst day fishing is better than the best day working

[inthetuck]

do u know anywhere that i can buy an arrow system for my nsr as well, i know arrow make them but i dnt know any one in the uk who will supply them

[alains]

i do not know , but look above and send a fax or a mail to ronnie amighetti with the year of your bike , he will guide you about buying a jollymoto which is far more better than arrow
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the worst day fishing is better than the best day working

[Whitetrash]

[Simple]

Im looking at getting an NSR125R 2002 bike,

the guide on the site posted at the top of the thread
the guide for derestricting NSRs says upuntil 2001 spec bikes...

is there a difference in the derestriction?
is it still possible


Simple

[alains]

the engines are the same in UK & IT since 1989 , they have been changed only for france in 1993 (11.5 KW)and for special models in DE (50 mph) , SU , SW (both 70 mph) . they stop selling them in 2001 in france may be this why you were thinking about the thread
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the worst day fishing is better than the best day working

[alx.f]

about de-restriction a NSR125RR import. Do i need to change the cdi box aswell as the fuel inlet and the zost? The bike is from Italy and is a 2004 bike. Cheers for any help.

[alains]

the bike is named NSR125R the second R is the year of make 1994
check also your jets you need with a race exhaust jets as : main 145 , slow 45 , power 70 . you can change also your reed valves by carbon one and fit a BR9EIX . no restrictions except the RC valves control box which not open fully the valves . look the post i've just put on about an added circuit
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the worst day fishing is better than the best day working

[DimmniBurek]

Hi, I have 1999 NSR and it goes only about 110km/h, thats aproximately 65mph, some guy told me, that it has someelectronic restrictions!
How to derestrict this?
PLEASE HELP ME
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[alains]

pass me a pm with your serial number (something like ZCJC ........)
i will try to find out which kind of nsr it is .
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the worst day fishing is better than the best day working

[DimmniBurek]

Where do I get this number?
Is it on the bike? Where?

I was told that this electronic restriction is under the seat in some box with silicone, and you just have to cut the wire and put the silicone back in
____________________
There Is No Stronger Drug Than Reality
There Is No Engine Like TURBO Engine

[alains]

do not do anything stupid . i suppose you have in UK a paper going with the bike , your serial number is surely on it . for exemple mine is ZDCJC22B0WF203518 . JC22B is the type of the bike , 0 import , W is 1998, F france and 203518 frame number . try to find this number .
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the worst day fishing is better than the best day working

[DimmniBurek]

So this number is in the papers?
Im from slovenia so I dont believe its UK version...
Well, I write the number ASAP
____________________
There Is No Stronger Drug Than Reality
There Is No Engine Like TURBO Engine

[DimmniBurek]

This electronic restrictions makes a hole in rpms, it doesnt go so much between 5000 and i think 7000rpm
____________________
There Is No Stronger Drug Than Reality
There Is No Engine Like TURBO Engine

[alains]

no , the restriction is in the full opening of the valves . in the UK (and IT) version of the control box the level of the voltage provided to the servo is 5.2 Volts , for the others it's only 4.3 Volts . have a look on the attachment .
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the worst day fishing is better than the best day working

[DimmniBurek]

WTF?
Whats that?
I dont get it, the restriction provides more volts than unrestricted or what?
I just want to derestrict this electronic restriction, so what should I do?
____________________
There Is No Stronger Drug Than Reality
There Is No Engine Like TURBO Engine

[alains]

no , you're wrong . look on the doc the servo-motor work , i think it's clearly explained . the rc control box has voltage values function of the rpm . on UK & IT models this voltage is 5.2 Volts , on import models it's only 4.3 or 4.4 volts . the servo is an electric motor which has on it's axel a potentiometer fed under 8 Volts . when the servo move left or right you've got on the cursor a part voltage function of it's position . at low it's around 2.2 volts at high it should be 5.2 . this voltage is returned to the box which check is the required position has been reached . this easy to see that : when you put you key on , you hear the servo moving anticlockwise then moving back a bit to adjust the valves at 1/4 opening . this process is the same when you put throttle on . the servo is only a slave making the job under the control box references . so , if you want a de-restriction , you need first to know which control box you have and which CDI (in case of import)
this why it's important to know your serial number , prior making a de-restriction . is it clear enough ?
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the worst day fishing is better than the best day working