Hi,

Does anyone run their NSR250 with individual filters? I saw on the carb tuning page of this website a picture of an NSR carb with a cylindrical black / blue air filter. Please can anyone tell me what this is? And where I can get one?

Thanks, Mat Grant.

You can get them from demond tweeks or a simular place. Andy (nsr-world) uses them as does my freind on his MC21. I think afew other forum use them too if they remove the air box.
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If I have to take the carbs off once more...

Those particular filters are made by Ramax.

Pod filters generally tend to screw up the mid range a bit, but hey, it's loud and it looks good, so what the hell! :lol:

Flat out or parked, that's what I say!

Andy.
NSR-WORLD.COM

Andy wrote:Flat out or parked, that's what I say!
Andy.
NSR-WORLD.COM

Just like his women!
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

Andy.
NSR-WORLD.COM

Hi,

Thanks for the replies - Ramax... not heard or them, I've heard of a company called Ramair(?) Could that be it? Does anyone know where to get the Ramax filters from for the TA22 TA21 carbs?

The issue for me is that I am building a project bike, and space is critical, so I'm going to the individual filters for space reasons. I'm hoping they will be less restrictive on peak flow, so may give higher top end power, I'm expecting the midrange to get worse, I'm not too bothered as long as it's rideable...

Does anyone have data or experience from riding for how they affect power?

Thanks, Mat

Being as the Ramax filters on the bike in the Site belong to me, I guess I'm partly qualified to answer this one!

They are definitely RAMAX filters, NOTRamair. They each need to be trimmed on one side a little as the carbs are so close together.

Mid range suffers a little, but good dyno time should claw most of it back (I'll let you know on that in a couple of weeks!).

The carbs sound great with filters... just about as loud as open carbs.

Andy.
NSR-WORLD.COM


Last edited by Andy on Wed Dec 15, 2004 9:06 pm; edited 1 time in total

Thanks Andy, I'd be really interested to see the dyno curves for the bike with the Ramax air filters. Why did you go to them by the way?

I have a hybrid bike, NS400 engine in an RGV250 frame, I'm in the process of trying to fit NSR TA22 carbs as they are bigger bore. The NS400 airbox doesn't fit in the RGV frame so I've had to cut it down. It is now small, and because I'm worried about them being restrictive, I want to fit individual filters...

Cheers, Mat.

StephenRC45 has an NS400 that I think he was going to fit MC21 carbs to at some point. Maybe you could compare notes later?! He'll be doing some dyno runs on my MC21 shortly, so charts will be available for you all to laugh at soon.

I bought my Ramax filters from a local scrappy who just had them sitting on the shelf. I figured I would bond the foam part to the original rubber rampipes but when I offered them up, by happy accident, they were exactly the same size as the NSR carbs! Cost was about £40 for the pair though, so not exactly cheap!

Andy.
NSR-WORLD.COM

I thought the best thing for carbs was a big airbox - better even than pod filters?

That being the case, surely the best thing to do is build a big box - can't be that hard to do: bit of card, pair of sissors and some fibreglass should do it!
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

Dave Ett wrote:I thought the best thing for carbs was a big airbox...

It is, but the pods lookcooler! ;)

The airbox also quietens things down... now that's no good is it?!! :lol:

Power? Who needs power!

All show and no go... that's what I say! :D

Andy.
NSR-WORLD.COM

Hi,

That's what I've done, built an airbox cut down from the original NS400 one and rebuilt with fibreglass. Building the airbox is ok to do - but I can't build a large airbox because there isn't space, the NS400 frame is a lot wider than the RGV one. The airbox I've built which just squeezes into the RGV frame is a lot smaller than the original NS one.

Racers run open carbs, isn't individual filtering the next best thing to open carbs for top end power? Like the individual filters that people fit to RG500s?

Mat.

You need the biggest, badest air box you can make. There are a few thing you can do with the stock carbs for an NS400. But that would have to be covered in another thread. MC21 carbs could be fitted in a bank of 3 if you made up new inlet manifolds.

damnit that was from me.
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If I have to take the carbs off once more...

Your best bet will be to build the 'box up as big as you can, but leave it open (like an HRC airbox). Fitting the pod filters will give you the protection you need from dust and dirt. The large airbox will then be more of a "still air" shield, which is what you really want on a 2-stroke... unless you ram-air it, of course!!

As long as it's loud though!!

It's not the HP at the wheel, it's the Db at the ear - that's what I say! ;)

Hey, any chance of seeing this project?

Andy.
NSR-WORLD.COM