Honda nsr j22 2001 de-restricted but not fully performing

[nsr_J22_FOXEYE]

Hi every one, first time here, straight from nsr125.com . I have a small problem where as I have bought a 2001 Honda nsr in good condition and runs well but isn't amazing acceleration and only has a top end of around 90 on a good day. 0-60 is around 12 seconds and as I mentioned top end is usually 80mph but did roll up to 90 at mega ride. I have checked the exhort and it has had the restriction taken out and is the UK model so am pretty stumped as what is going on. any idea's would be cool, but please don't just jump to problems that you had, I don't mind you asking a question to find out more about the bike to confirm it, or give me a possible solution and going on to say you can check this by...

The power kicks in at around 7000 rpm.

Thank you for your time guys n gals, hope to hear from you soon.
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Never Ride Faster Than Your Angel Can Fly

[stirlinggaz]

checked gearing?
cheers,
GAZ

[swampy]

Have you taken out the restrictor from between the airbox and the carb ?
____________________
"I hate to advocate drugs, alcohol, violence or insanity to anyone, but they've always worked for me." Hunter S Thompson
"Faster, faster, faster, until the thrill of speed overcomes the fear of death..." Hunter S Thompson

[Carl_steveo]

Are you positive that it's the Uk model. Not calling you thick or nothing just making sure. I'm assuming you know how to check, but then if you know how to check then I'm sure you have already checked anyway lol. The Uk model only has an exhaust restriction so there shouldn't be an intake or electrical restriction.

As has been suggested you can change the gearing to get a better acceleration or top end.

Edit: Just a thought, do they need upjetting when you derestrict the standard exhaust?
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Current: Honda Nsr 125
Live: Sunderland
Luke "cant be arsed to read your post, but suck my balls anyway."

[nsr_J22_FOXEYE]

Gaz : Gearing "looks" standard so shouldn't be a problem but the bike is booked in Monday for a better for acceleration sprocket, thank you for you post.

Swampy : I assume the owner before me or before him wouldn't have been so stupid to leave that in, I had a quick eyeball and took the air filter out but didnt get as far as the manifold with the restrictor due to lack of proper tools, thank you for you post .

Carl : Frame numbers I believe, and I did check it, tbh that could have caught me out a few years ago so thank you for checking a simple one that I bet some people miss. I do believe they need re-jetting after a de-restriction and carbs need looking at. Any way you know of to check if this is the problem? thank you
____________________
Never Ride Faster Than Your Angel Can Fly

[Kickstart]

Hi

Assuming the intake restrictor is removed then it does sound like a possible mechanical issue. While incorrect jetting would slightly affect top speed I wouldn't expect the difference you have without it being dangerously lean (and prone to seizing).

I would say to do a compression check (should be 128psi +/- 14psi I think). Also if you have the exhaust off then look up the exhaust port and examine the power valve blades, possibly operating the ignition switch to get them to cycle while you are looking (don't start the engine while looking up there!). I have seen an NSR where the power valves had worn and one had dropped down out of position.

You acceleration is exceptionally poor, but gearing wise that would only happen with very high gearing, which wouldn't really affect top speed by that much (just top speed might be in 5th or 4th rather than 6th), assuming you are revving it out through the gears.

All the best

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

[swampy]

[nsr_J22_FOXEYE]

can over filling the gearbox cause the problems described?
____________________
Never Ride Faster Than Your Angel Can Fly

[Kickstart]

Hi

It seriously over filled then maybe.

All the best

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

[skatefreak]

As mentioned, it depends on how overfilled...
I'v had my 01NSR up to 1,200ml for about 60'ish miles (unknowingly at the time of course!)
without any long term problems for running issues at the time...
But i wouldnt recommend it...

Has the performance of the bike deteriorated or was it like this when you bought it, if it was like this when you got it i'd say check out all possible restrictions (compare part numbers) as you never know what was done by the previous owner...

Check out this file:
https://www.geneva-racing.ch/~alains/NSRtips.doc
curtesy of alains (NSR guru).

Best of luck

-Jvr