NSR 125 rr

[Blunet600]

was wondering about whether the NSR will need rejetting once its derestricted because at the moment its restricted in the exhaust and air intake (im not sure on the sprocket). and i wanna derestrict asap but im not sure whether the bike will need rejetting or not?

[tatters]

If its a RR its a european import so has the CDI resitriction as well. use the search funtion to find posts about it.
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

[Blunet600]

its not an RR its only 1 R.lol.

[mrsteko]

hey there dude,

Have a look at the exhaust and air intake behind the carb. If the exhaust is restricted, there will be an obvious collar just inside with 3 welds holding it in place - drill these out and remeove the tube. Simple case of removing the plate from between the carb and cylinder.( both these actions are described on the nsr125 main site)

Now, if these two elements are not present, then your bike is electronically restricted. In this case you must check the reference numbers on both the power valve control unit AND the CDI.

Power valve control unit should be TV-78
CDI unit should be CI 626

Anything other than these units are restricted and must be replaced,( eg CI 639 - restricted)

Later!
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Theory passed Dec 05 : Practical passed 28th April '06
Bikes : 1999 NSR 125 R (sold)
: 1998 bandit 600

[alains]

as i said number of times , the bike serial number will tell if it's restricted or not . look the letter after ZDCJC22 :
A italy (not restricted)
B france (barrel different)
C UK (not restricted)
E Switzerland (barrel different
so all these bikes are restricted on exhaust and have an intake plate between carb & engine , and they are underjet .
B & E have electronic restriction on both CDI & RC valves control unit . you can transform them in uk specs by changing barrel kit and the valves system (base guide and the 2 valves) . you must also change both electronics but it's necessary to cross the green and yellow/black wires on the 4 wires connector coming out from the loom and going to the CDI (no modification changing the RC valves unit) . warning! the valves cables are reversed on those bikes .
look my file https://www.geneva-racing.com/~alains/NSRtips.doc
obviously you must :
- take off (on all bikes) exhaust restriction (they are sited differently on B & A bikes) and the intake plate
- upjet as main 138 , slow 42 , power 65
- fit carbon reeds and BR9EIX plug

NOTE : some bike between 1996 & 1997 may have a special number begining by ZDCJC228 and on those i've no info about their restrictions , the best way to find is to look both electronics . CDI with CI626 are unrestricted , RC valves with TV-78 also
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the worst day fishing is better than the best day working

[NSRracer]

LOL, so many replys but no-one has actually answered the question. Can't you see he's asking if he need to rejet or not after derestriction rather than asking how to derestrict.

And on the matter... I'm not 100% sure that its an absoloute must, but i've been told too gain the full power out of it, rejetting is pretty much the clever thing to do.

[tokarev]

[Kickstart]

[Finglonga]

[alains]

i think you feel nearly the tricks . download my file here :
https://www.geneva-racing.com/~alains/NSRtips.doc
if you want more infos send me a pm with your serial number
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the worst day fishing is better than the best day working

[NSR-Rulez]

Flip told me that the jets did not need changing when derestricting a UK NSR, which is it rejet or not, as i will hopefully be derestricting soon to


NSR-Rulez
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Past: 1985 Suzuki GS 125 + 2002 Honda NSR 125 R-2 + Ford Fusion
Present: Honda CBR 600 RR-5 + Suzuki SV650S-K4 + Mitsubishi FTO GPX

[alains]

when you derestrict , you hope to go higher in the revs , so if you do not want a seizure you must fit a bigger main jet , a bigger power jet . the bigger slow jet is just to ease cold starting . you are set at 132(or 135) , 38 , 55 (or 60) , i recommand 138,42,65
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the worst day fishing is better than the best day working

[NSR-Rulez]

Thanks alains, i'll get the jets when i derestrict,


NSR-Rulez
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Past: 1985 Suzuki GS 125 + 2002 Honda NSR 125 R-2 + Ford Fusion
Present: Honda CBR 600 RR-5 + Suzuki SV650S-K4 + Mitsubishi FTO GPX

[fuzz]

I've just rejetted mine after using it for a year as standard. You will not blow it up by not rejetting, so it isn't a must. The reason I did was to see if I could get it to pull in top gear up to the redline, as it only ever got ot about 9000 revs in 6th.

Jets I had already in place were 135, 38, 65 so you might not need another power jet. Mine was an Irish import, however, but is identical to a UK spec. If you do need a power jet, you can have mine.
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https://www.bikepics.com/members/fuzzbcf/
Bikes: '99 NSR125R, '00 SV650S, K1 GSX-R600, '97 CB500, K3 SV1000S, '16 VFR800

[lllN30lll]

[Chiz]

I was also thinking of derestricting my nsr and was just about to ask the same question. One of my mates used to have an imported nsr (2000) and he said his bike seized three times after derestricting and not changing the jet but another person i know who had a uk nsr (1995) derestricted it and didn't bother changing the jet - his never seized! I'm still not sure whether to change the jet in mine (UK 1999). I was planning on derestricting it tomorrow but i'm not sure now. ???

[alains]

check your jets and go for 138,42,65 otherwise DANGER , i have no time to explain why it happens to one and not to the other , but DO IT !
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the worst day fishing is better than the best day working

[Jamie.]

125's are not made for speed, so why push them?

[puremagic72]

nsr125's are made for speed! thats why people professionally race them, and that you can tune them to get 100mph+!

[Chiz]

Chickened out of derestricting - all this talk of seizing scared my wallet. Gave it a service though and found out there was almost no brake fluid in the front (wondered why i had to touch the bars before it started to bite anyway, much better now.) Where do i get different jets from and what do they need to be?

[Chiz]

Just spoke to a honda spares place - apparently the only jet that will be a different size is the main jet (135 not 138). And its going to cost about £70 for the set! sounds a bit steep to me, what kind of price should they be and where's the best place to get them from?

[lllN30lll]

i have an ns125r, i got my jets for about 2 quid each from a place called Dans Motorcycles in Stone, Stoke on trent.

or try get some from the Dellorto website
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Turbo R1
CRF450R

[Kickstart]

Hi

New jet from the Dellorto importers should only be a few quid.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[alains]

exactly , shipped to france 3 jets are £12 , so to UK about £10 for the 3 . other thing the NS125R (TC01) and the NSR125R (JC20-JC22) are 2 different bike the carb is 26 on TC01 and 28 on JC's
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the worst day fishing is better than the best day working

[paul]

I have a fully derestricted french import nsr and I havn't upjetted it. I have never had any problems with the bike and it always gets to 11,000 revs in 6th. I understand that the bike could seize at high rpm but it seems fine however you can never tell with a 2 stroke. If you have a UK nsr there is no need to upjet.