Honda NSR 2001 Restriction

[prawnstar3000]

Hi fellas,

New to the boards so before I go ahead and ask you a question i'd like to say a big hello to all the fellow bikers out there.

I have just bought a 2001 NSR which has all the restrictions in place, and I am going to remove them, but the bike only does 60MPH and will not rev past 8000rpm, now from what I understand about UK spec NSR's is that they are restricted in the exhaust and the air intake, but usually as stock they will do 75mph even with the restrictions in place.

Do you think that the bike has been restricted via the CDI unit as it seems a tad strange that the bike will only do 60mph and will only rev to 8000rpm.

Just incase you wondered I am not a learner, I actually bought the bike as a fun little run around and it was cheap, my other bike is a 04 HM Plant blade, but that only comes out when the sun is shining, I want to use the NSR to go to and from work on a daily basis, but still want to be able to overtake if I need to.

[Timmeh]

www.nsr125.com.
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GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

[prawnstar3000]

Yeah cheers for that timmeh, but I already knew about the restrictions and how to remove them, it just seems funny that this is a uk spec bike, yet will not go past 60mph, it feels like it wants to but then gets tugged back again.

I know it is a uk bike because the HPI check said it was not an import, yet even on that site it says that a stock bike will do 75MPH.

Just proper confused.

[Timmeh]

get the compression and fuelling checked.


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GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

[alains]

give me your serial number (between the yokes) , it begins by ZDCJC22..........
download my file https://www.geneva-racing.com/~alains/NSRtips.doc
if you have further question you will be welcome . i dont want to denigrate the site shown above , but it needs to be updated and doesnot show the new models
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the worst day fishing is better than the best day working

[prawnstar3000]

cheers alains will post my serial number tomorrow as its all under wraps at the mo.

But if you wouldn't mind checking it for me tomorrow I will be grateful.

Cheers for your help bud.

[faith183uk]

I would still check the cdi unit and the valve control unit to make sure they are UK versions.

I see you HPi'd the bike and the VRM has come back as UK, but with the ever growing prices for the uk Spec units many learners have sold the original units and then bought cheap alternatives. We have had about 4 or 5 UK JC22's NSR's come through the door with import boxes on. Mainly the valve control unit, it should be TV 78

Also check the valve servo is opening correctly by lifting tank and reving engine.

Also check no washers have been placed on the throttle cable near the carb (another old school restriction sometimes used)
Finally check the jets in carb and the carb needle notch position.
Check air box filter, and fuel tank breather hole.

Just one last note, also check you have no physical problems like binding pads on discs, bearing etc as this along with riders size, slightly under inflated tyres etc could easily drop 10-15mph off top end.

[alains]

i think you know a bit but this bit is very small . dont say things idiots like "washer in the throttle" or "people sold their original electronics and replace by cheaper model" !
after 15 years of practice & mechanics on this bike i can speak about it , which is certainly not your case !
i wrote several documents with mates that you can download here https://www.geneva-racing.com/~alains/NSRtips.doc
after reading it you may be able to argue
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the worst day fishing is better than the best day working

[MaybeGuy]

the CDI restriction would act as a rev limiter wouldnt it??

does it bounce off the revs? like screeeeeee bingbingbingbing at high RPM?

can you redline in any gears?
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[alains]

mostly CDI are restricted by a bad curve of ignition timming
for exemple the CI639 has a nice curve 2000-4500 then the curve has a limitation until 6500 , afterwards curve is ok and a limitation appears at 10500 (note that the CI626A do the same)
on the CI626 the curve is not optimum until 7000 then you feel the quick but no limitation appears over 10500
if you've got a race pipe and your valves well tuned 12200 is possible in all gears (this is what i've got) . obviously you wont reach red zone on climbing due to the weight
actually mate of mine is testing a programmable system from https://www.zeeltronic.com/page/honda.php
note that the alternator charge on the CR250 gives the same voltage as the NSR125R (200VAC)
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the worst day fishing is better than the best day working

[prawnstar3000]

First off let me thank everyone for their input on this is is appreciated.

Right the bike gets up to 8,000 revs which I belive is where the power should kick in but will not rev any higher that, you can feel that the bike wants to go higher but gets tugged back.

As I said before the HPI check says that the bike is not an import, so if it is not an import how come the clocks are in KMH?

I cannot redline the bike, it will not rev that high.

As to the brakes binding on sure that may limit the speed a tiny bit but it would not stop the engine from revving higher than it should do. But thanks for your input.

I have given alains my serial number lets see what he comes up with, I haven't posted it on here just incase. I will read your articles alains soon I am just in the process of buying word, hopefully they will shed a bit of light onto this subject.

Still confused!!!

[faith183uk]

Alains thanks for your comments -

Firstly, let me say because you have taken the time to write a quick info sheet on NSR 125s doesnt make you a genius on motorcycles.

Its extremely arrogant of you to assume just because you have knowledge on a certain model motorcycle its beyond possible for a uk bike to have had the cdi or Valve contol box changed in the past especially at 7 - 8 ys old given the nature,age and budget of the propective owners ie 17 yr olds

Secondly, 15 years agreed gives you a great knowledge of the NSR im not disputing that, but so does operating a motorcycle repair and tuning centre that has worked on all types of 2 stroke for decades motorcycles not limiting ourselves to just one model.

We have had 5 or more NSRs UK spec with changed cdis come in this year already, thats not a suggestion - Thats FACT.

Like wise, many nsrs have had washers added to the throttle cable, not as standard nor as a recommended or traded restriction. Again very foolish to assume this is not a possible scenario given it was a done practice on many previous models 2 strokes and a very much done practice on top end rebuilds in the past to limit revs during run in.

Perhaps you would like to contact stan stephens for clarity

[alains]

before my first NSR 1992 , in 1979 i bought a suzuki 125GT then 5 years later a 125GT/2 (first appearance of intake valves) then a 125RG first model with intake and exhaust controled system . i use to learn each of my bikes , i was able to dismount anything without the book . as electronic controled bikes appears on the market with restrictions , i was member of forum and we study how to de-restrict bikes and especially the NSR . i think it's criminal to restrict a so nice and healthy bike , this what has been done in france instead of limited cc's for young ridders . on my file all the technical mesurements are not written but i have it on my PC . so i know what i am talking about and without being arrogant , i still say : washer in a throttle is the biggest stupidity i've never heard and about the country specs , i am pretty sure that more than 50% of NSR sold since mid 2001 are french import
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the worst day fishing is better than the best day working

[faith183uk]

Oh agreed the washer restriction is ridiculous and ofcourse completely extint in terms or sensibility or reason.

keep up the info alains, by looking at past nsr posts you have helped a hell of a lot of people out and after all, thats what its all about.

All the best

[prawnstar3000]

Please let me point out faith that alains has correctly helped me identify what restrictions my NSR has, a job that would have been hard for me if I had not of spoken to him.

It is people like alains that help these sort of boards tick over. I don't wish to sound rude to you faith but as I just said his help has been enormously appreciated, and lets hope he can help many people like me in the future.

[faith183uk]

Thats what i said above?

Dont get me wrong im sure alains has been more than helpfull to numerous people. I was originally replying to his comments that i shouldnt suggest things that in his mind is rubbish, and a statement that im less than qualified to make such suggestions anyway, unlike him apparently. I feel that having earned world respect and name for some of the best 2 stroke street and road tuning available as featured in MCN etc, given my credentials im more than allowed to defend my opinion, especially on a net forum.

Fact is having worked professionally on 2 strokes for public and race, being the only tuning centre to bring an RS125 to a true 32BHP at rear wheel with 100% reliability, tune and set up more bikes than the rest of this forum put together if my expertise isnt wanted then no biggy my end.

Good luck to you all

[alains]

dont take too much out of your brains , only the result is worth of that , but which is even worth is the friendship : be bikers
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the worst day fishing is better than the best day working