Is my NSR125 restricted

[flik9999]

Heya so my bike is an NSR 125. I took a gps and found that it only really wants to go to about 72 mph (GPS) on the flat at 9k revs. Downhill it can do 10k revs which is about 80 mph. Clocks obviosly read more but what speed should I expect from a restricted or derestricted NSR 125.

Frame number is ZDCJC22800F008387

[jaffa90]

Sounds ok to me without tampering with.

[Teflon-Mike]

Restricted it has about 13bhp. Unrestricted it has about 22.
How fast do you hope it will go? The most powerful of the kiddie-go-kwik two-smoke 125's had just under 30bhp, and couldn't quite nudge the ton. Only specially prepared homologation special variants ever did that... just. They were all about as slow as a forty year old four-stroke 250 commuter bike, and if you check specks there, little with 20-25bhp, struggled much over a genuine 80mph.
On what is now, at least an 18 year old bike, that was rather prone to kiddie-go-kwik abuse when it was new, let alone with two decades or more of contributory abuse, PERSONALLY, I would merely be slightly more gratelful that the dang thing went at all! And 70mph is as fast as anything is legally allowed to go in this country, so what does it really matter? If you want more oomph, then there are an awful lot of bikes that have it, and can help you loose life or licence that much sooner, and probably not waste so much money or frustration along the way... b-u-t....
On a bike of that sort, of that age? Trying to speculate whether it may or may not be restricted from how fast it tops out, or its frame number, is pretty futile and least of worries, really.
It could have had any number of owners fiddling it it in the last twenty years, and who knows how close to 'standard' it may or may not be, or which 'standard' it likely doesn't comply with anyway!
And, as said.. its a 125, and as fast as any bike is legally allowed to go in this country, does it really matter much?
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It's about right. I had 2, one was fully de-restricted and would read just over 100mph (so probably around 90-95mph) with my skinny ex on it, the other was restricted and would read late 70's with my lardy arse on it, so probably around 72mph. I found the restricted one was rich at the top end though and actually went quicker with the throttle backed off slightly.

There are loads of differing restrictions depending on country of origin. My full power one was Italian and had restriction to the exhaust, which I found with an inspection camera. I got around this with a full Arrow system and a rejet. The restricted one was a UK bike and had a restriction to electronically restrict the power valve. All you had to do to disable this was remove a little plastic jumper with a little handle, which connected 2 wires in the little wiring box by the left of the cylinder head. You'll see what I mean if you look.

There's a poster who comes on here sometimes called Alains, who is an expert on all things NSR125. He has a great document with all his findings and can probably tell you the country of origin from your chassis number. What language are the safety stickers on the tank in? Mine were obvious Italian on the full power one and clearly English on the restricted one.
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[Ice Burger]

Your bike probably hasn't been fully derestricted, if not derestricted at all.

I've got my own fully derestricted Nsr 125.

It does 110mph, for a full derestriction you must remove the air intake restrictors and remove the exhaust restrictor. If you want higher top end speed you have to change the front sprocket too.

Essentially a good derestriction involves more air and fuel coming into the engine - and bigger bang, plus the exhaust gasses being able to flow out easier.

With a proper tune you can see the likes of 30hp if the carb is set up properly.

here's a guide
https://www.nsr125.com/derestrict.htm

PM me if you want help.

[Polarbear]

30bhp & 110 from a 125

I struggle to believe that when my 30hp YDS7 and RD250's struggled to break the ton.

https://dropbears.com/h/honda/nsr12599.htm

https://www.motorcyclespecs.co.za/model/Honda/honda_nsr125r%2097.htm
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[Ice Burger]

[MarJay]

[Ice Burger]

At my earliest opportunity I will try and prove it.

[redeem ouzzer]

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[redeem ouzzer]

RD250's etc make around 22-24 bhp at the wheel, good for 90-95 depending on how many pies the rider has consumed.

I would expect a 125 single making similar RWBHP would be good for a bit more as it's a fair bit lighter.
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[flik9999]

Would a conpression test reveal if its restricted or knackered?

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[flik9999]

Allegadly they were replaced just before I bought the bike at 20000 miles its now at 22k. However the seller is a liar and told me it was t restricted when it appears to be. Would a derestricted bike in bad condition do higher than 72?

Also you are meant to do rings every 6000 and piston every 12000 is it double that if the bike is restricted?

Heres a picture of my tank

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[alains]

go here https://www.bike-parts.fr/honda-moto/recherche_vehicule/chassis/ZDCJC22800F008387/FRANCE
all models before 1998 begin by ZDCJC228
then you will see that your bike is from italy 1997 with a sport production identification
it's most probably that they have change the licencied system has been replaced by the standart system . so control that your CDI & valves control are unrestricted models
the id is printed on the short side opposit of the looms
the controler should be TV78 , the CDI should be CI626 (not CI626A)
do a compression test (must be 125 PSI minimum) under 115 must have the top-end reset .
do everything and keep me posted
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[stevo as b4]

I agree with blue tbh!
I'm not necessarily say de-restrict a reliable good running bike that's just a daily rider to work or general A-B hack. Performance two strokes and daily use don't really sit together happily and who wants doubts about if it'll melt down on the way to work, or have to spend a weekend a month with the engine in bits and waiting for spares?

But back on topic, as Blue said take an Italian 125 sports bike around a decent technical track and it'll batter the shit out of a wobbly poorly braked and poorly sprung 250 four stroke twin that TM loves to mention.

Let's indulge him in his only as fast as a 250 mindset,
as there were some relatively fast 250's on top speed (not acceleration mind). A Honda VT250 could have up to 38-40bhp in the most powerful variants, and should in an ideal world do 100mph plus 5-6mph more regularly.

A Suzuki GSX250E was tested by MC mechanics at a best of 90/92 mph true. The Superdream, Z250, etc etc would all be about the same at best, and in the real world of hills and headwinds could be going a fair bit slower most of the time.

They were quite heavy too, as well as spindly chassis, crap brakes and old school tyres that you can't get in sticky push it to the limit compounds. Not only that you'll lose the centre stand if not both ends of the bike, long before a Mito etc has put a scratch on its hero blobs.

On a track there's no way an old 250 could beat a 125 cc sports bike it's physics!

[flik9999]

So deristring reduces reliability yes? But does that account to ragging the bike at 100 mph or just general wear and tear? If for example I derestricted and just used the derestriction to get better acceleration (0-6 in 6 seconds instead of 10 seconds). Am I putting the bike under more stress than if it stays restricted?

[flik9999]

Is the cdi near the taillight? Theres some sort of black box in front of my taillight under were the seatclip is?

[flik9999]

Ok bike is definatly restricted found this sticker.

Honda Italia IND. S.p.a
Standard motorcycle
124 cm3
9.0 kw
62.5 kw/1000kg
ZDCJC22800F
008387

Coupdnt find the cdi. What restrictions do italian bikes use? According to internet they dont restrict bit this one is definatly restricted.

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[flik9999]

Its got arrow. I take it thats not standard? Do italian ones tend to have cdi or is it just pipe and carb?

[Fin]

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