Which NSR reed and filter do I use?

[ZaphodBeeble]

Hi guys,

Just bought a '99 NSR

I'm going to take it apart and give it a damn good going over before I ride it so I thought I'd order some better components to fit while I'm at it.

I thought I'd get some better reeds for it and maybe a cone filter. I need to know what (in your opinion) are the best ones to buy.

Also, I think I'll need to re-jet the carb if I put a cone filter on it, so how do I do that? How do I know what size jets to use? I can do the work, that's easy, it's just knowing what jet size and mixture setting to use.

Cheers guys.
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Current bike: VTR1000F Firestorm. Previous: Firestorm (written off) - XJ600 Divvy - NSR125 - DT125 and a load of offroaders.

[bikedudextrm]

Yes you will have to up jet the carb if you fit a cone type air filter as it will let in alot more air so you need more petrol going in to compensate.

To up jet you will have to take the carb off, turn it up side down and let all the fuel drain out, then just undo the screw's on the bottom of the carb to take of the bottom part of the carb. This will expose the jets, the main jet is usually the one in the middle so just unscrew it and replace with what ever size jet needed.

It's best if you look in the work shop manual for your bike as it gives you a full step by step guide, some one on the site should be able to give the link to a site to download it.

Also there is no set guide to jetting, it's just a case of trial and error. Start from a main jet about 10 sizes larger than standard and just work your way down until it's running right. Also check the colour of the base of the plug, you want it to be a nice tanned colour and if it's too light or dark it means your bike ain't properly jetted.
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https://www.bikepics.com/members/bikedudextrm/

[mr jamez]

Well I would not even bother changing the reeds, it will not make a difference, just stick with the standard ones. By all means check that they are ok if you want to. As for the air filter, doubt that will make any difference either to power but I would imagine it will create more noise and the hassle of messing about with the jetting.

[ZaphodBeeble]

There will be an increase in power. If there is more air and fuel going into the engine then I imagine that the engine will produce (slightly) more power. It will also make it a lot easier to work on the bike in the future as the HUGE airbox won't be in the way.

I don't mind re-jetting as long as I know how to tell when it's right.

I also don't need to know how to take the carb apart as I have done that many times. I've just never altered the jets or messed with mixture.

I won't bother with the new reeds if you think it won't make a difference then. I'll just clean everything...
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Current bike: VTR1000F Firestorm. Previous: Firestorm (written off) - XJ600 Divvy - NSR125 - DT125 and a load of offroaders.

[mr jamez]

Well I agree about the air box being annoying Mine just does not fit right and gets in the way of everything, I had to seal up the hose that connects to it with silicone because the air box is at the wrong angle for it to go in. How much are the cone filters?

[alains]

they are not very expensive , but remember that the air intake has been made to guide the air in the airbox , so at high speed you may have trouble with the mixture . what i will recommand is to make the filter-carb entry a bit bigger .
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the worst day fishing is better than the best day working

[mr jamez]

[alains]

according to my friends (owners of nsr) they never put cones into their bikes because the cones will be durty quite quicly which affect the mixture and you knox that poor mixture make piston breaking ..the only way to make the box bigger is to adapt a conic entry at the base of the air box , take out of the right pipe the wiring and to guide it outside . also the foam can be exchange with kitchen loo-vent filter
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the worst day fishing is better than the best day working