NSR 125 Problems

[MartinMyhre]

Hi,

I have a 1992 Honda NSR 125, alcast frame, serial number starting with "HI-JC20".

I checked the exhaust for restrictions, but didn't find any, also checked the intake plate, nothing there either.

The bike only seems to hit 75 mph, with a pretty slow 0-60.

Any ideas on what's wrong with this bike?

[andy_g2k7]

have you tried cleaning the carb or de-coaking the exhaust things like that. i no there small things but they can make a difference as i found out on my ns125r
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nsr's rule

[The Artist]

It's a 125...

[andy_g2k7]

have you tried cleaning the carb or de-coaking the exhaust things like that. i no there small things but they can make a difference as i found out on my ns125r
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nsr's rule

[Hobes]

[mysterious_rider]

[alains]

check :
1) the compression (less than 125 PSI is bad and in this case a top end repair is necessary)
2) check your valves sequence of working (download my file https://www.geneva-racing.ch/~alains/NSRtips.doc
if your servo-motor doesnt move write me , i will guide you to investigate the bug
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the worst day fishing is better than the best day working

[MartinMyhre]

[alains]

MESURE COMPRESSION !!!!!
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the worst day fishing is better than the best day working

[MartinMyhre]

Alright, will do it on monday

[MartinMyhre]

the compression was at 120 psi, is that too low?

[alains]

book says : under 125 PSI is not good but not so worse
probably rings , which mileage and how long since last top-end maintenance (if you know)
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the worst day fishing is better than the best day working

[MartinMyhre]

The mileage is about 45 000 km, and the bike had a top end rebuild 4 years ago, but it's barely been ridden since, somewhere between 500 and 1000km.

[alains]

if you want to keep it more than one year , you should re-buid top-end which is around £220 . if not do nothing because the investment dont worth the benefit
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the worst day fishing is better than the best day working

[MartinMyhre]

Would i get any significant performance gains if i get i rebuilt?

The way it runs now is like its restricted, even though its not.
My cdi is a CI 589 C, and the rc controller is tv-78.

[alains]

i see !!!! your CDI is a french bull shit
find a CI572 but still , for my point of view, needs something to do in the top-end
just had a look on ebay and no luck , but in uk i know some breakers work together , find the site and ask (no more than £35)
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the worst day fishing is better than the best day working

[MartinMyhre]

Is it possible to cut a "bridge" on the ci589, like on the ci639?
Also the bike revs fine all the way up to 12000 rpm, so what would the ci572 do different?

[alains]

cuting the shunt on any CDI doesnt make any difference
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the worst day fishing is better than the best day working

[MartinMyhre]

So i should change the cdi for a ci572, and change piston rings? or a top end rebuild?

[alains]

it's only a question of purse
____________________
the worst day fishing is better than the best day working