Can't derestrict NSR. Help.

[ProXimaCore]

Right, I've mentioned this already but I had other problems to sort out at the time. So now that my bike is running well after adjusting the mixture screw and the idle screw (thanks kickstart) it's time for me to take another look at de-restricting my bike.

Problem is this. I checked for the intake restrictor. Isn't there... Checked for the exhaust restrictor. Isn't there....

Bike pulls up to 85Mph on the flat. 6th gear maybe adds that extra 5mph to get to that top speed but you have to get it just right or it drops all the way back down to 70Mph. If I get it right, then sitting in 6th gear at 85mph the revs sit at 9000RPM. Should a full power NSR reach the redline in 6th?

I don't know what the 0-60 speed is. I'll need to do some further testing on that. Feels really quick but then it's all I've ever been used to.

My bike is an NSR125. It's an R Reg '98. As far as I'm aware it's not an import. The clocks are in MPH. Under the seat on the frame it says it'sa NSR125RS. Not sure what that's all about...

Has anyone got any ideas for me to try? Sorry to bother you all with these crappy de-restriction questions. I'm sure you've had enough of them....
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Honda NSR125R -> Suzuki GSXR400R GK76a -> Kawasaki ZX636 B1H -> Honda CBR400RR NC29 -> Nothing

[Ste]

Is it an import or a UK bike?

If it's an import it'll be electrically restricted in the CDI.

[ProXimaCore]

How can I tell? Sorry...
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Honda NSR125R -> Suzuki GSXR400R GK76a -> Kawasaki ZX636 B1H -> Honda CBR400RR NC29 -> Nothing

[ZaphodBeeble]

If it ain't redlining and you have to be clever to change into 6th then I'd say it's still restricted as my bro's 2001 NSR will do 85mph in 6th with no problem at 9000rpm (so the sprockets are the same as my bro's too). It may well be restricted in the CDI in this case. Hmm weird...
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Current bike: VTR1000F Firestorm. Previous: Firestorm (written off) - XJ600 Divvy - NSR125 - DT125 and a load of offroaders.

[Ste]

[ProXimaCore]

[Ste]

That paint job in your Avatar doesn't look like a UK one but it culd be different panels to when new, and I could be wrong.

Does it have KM or MPH on the clocks? (I know you said it does 85mph but you can get overlays for clocks).Ever had any problems with the headlights dip for the MOT?

[ProXimaCore]

[Ste]

Import bikes have the lights dipped the other way to us, as they ride on the other side of the road, thus don't want the beams to be shining in the eyes of oncoming cars.

It could mean this, or it could just mean your lights aren't quite adjusted correctly.

[Adam_P]

Headlights on the continent face the other way as you drive on the other side of the road. In the UK they should point slightly to the left, as we ride/drive on the left hand side of the road. Its the opposite if its an import as it will have been set up for a foreign country's roads.

If they have questioned the positioning of the headlight in the MOT then they might have had to adjust it (a lot!) for it to pass.

Edited to say that Ste beat me to it and was much more brief. I knew I shouldn't have bothered!
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Colin McRae MBE 1968 - 2007 RIP
Orwell Rolls in his Grave
God is imaginary

[ProXimaCore]

I'm thinking that the headlights must have been adjusted at previous MOTs. The guy's exact words on the MOT were 'no defined pattern in headlights'. I remember it as I had no idea what he was on about.
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Honda NSR125R -> Suzuki GSXR400R GK76a -> Kawasaki ZX636 B1H -> Honda CBR400RR NC29 -> Nothing

[ZaphodBeeble]

I've never had to MoT a bike. What's it like? Is it as difficult to MoT a bike as it is a car? I've MoT'd loads of bangers (never really spent a lot of money on cars) and had loads of trouble. I know that bikes are easier to work on but I suppose I'm asking if it's just as strict...

EDIT: PS. What's the main problem areas that people get with bike MoT's too?
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Current bike: VTR1000F Firestorm. Previous: Firestorm (written off) - XJ600 Divvy - NSR125 - DT125 and a load of offroaders.

[ProXimaCore]

The other thing I got failed on was that my handle bars didn't align with the front wheel. Meaning that I had to drive with the bars squint to go in a straight line. It wasn't really that bad. But how I never noticed I will never know.

Other parts were just things like a loose bit of fairing. Easy fixed. The other thing was the switch for the rear brake light was knackered.
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Honda NSR125R -> Suzuki GSXR400R GK76a -> Kawasaki ZX636 B1H -> Honda CBR400RR NC29 -> Nothing

[Kickstart]

Hi

Does sound possible that it is an import. However on a 1998 bike it might well be old enough that it would not have had a cdi unit restriction.

How many miles has it done? Has it had the piston / rings changed?

I think some people have found different restrictions in the exhaust.

The handlebars should be fairly easy to fix. Loosen the bolts clamping the forks to the top yoke. Slacken off the front wheel spindle a touch. Hold the front brake on and push down hard on the forks quite a few times. Then tighten everything back up again.

All the best

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

[ProXimaCore]

[bikedudextrm]

Is the power valve system working. As my old Cagiva mito would struggle to rev past 9,000 rpm. I found the power valve was locked stiff in the cylinder because of the build up of carbon from the exhaust gasses.
I managed to get it out which was quite a struggle, then i just cleaned it and got all the carbon off. I put it back in and the bike would now rev out to almost 12,000 rpm no problem and now had a meaty boost at 7,000 rpm and top speed went up from 90mph to an indicated 110mph (on the speedo of course).

Good luck.

[ProXimaCore]

[stevo as b4]

A dyno test might be one way to find out if your bike is partially de-restricted, or rather has other restrictions, that u.k. bikes dont have. A healthy NSR125RR should see 22-23r/w bhp. If its much less than that then you have either a problem with the motor or powervalve, or else theres another restriction. I have heard that some NSR125RK models that were imports only do around 85mph, and make about 16bhp, so there is obviously another restriction, possibly CDI? Have you checked that the carb slide retracts fully at full throttle, and also that the jetting is right? Some bike exhausts like the later DT125R's have about 3 restrictors in them and maybe a a Cataylst as well, so its nearly impossible to fully de-restrict the std pipe.

[monkeyman]

My 2001 bike has the same performance as yours and i'm almost certain it is a standard UK spec bike. Because of a HPI check I had on it. , Anyway I took it to the garage and they were very persistent it that there was nothing wrong with it.

I’m pretty sure though that something is limiting the power though. I’m considering getting it on a Dyno.

Recently though I have had to take spark plug out and clean it because it was black with oil and it wouldn’t start. This is maybe because I really just do short journeys on it; I shall do a 30 mile ride and check it after. But would if it was running rich with oil would that slow it down?

How much does a Dyno session cost? What do they actually do the bike?
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RM 250, Husky TE610, K1 GSXR 750