Air filter pods.

[Hetzer]

I'm thinking of junking the airbox and fitting individual pods to the carbs.

In Japan I had to take the carbs off my Blade and fit a K&N jet kit as I'd fitted a full system (Micron). It involved drilling holes in x4 somethings. Everything went back together fine and the bike ran perfectly.

Now I read up on doing it again and everyone sucks their teeth and mentions dyno runs and carb-balancing. Did I just get lucky with the Blade or is it safe to wing it again?
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"There's the horizon! Ride hard, ride fast and cut down all who stand in your way!"

[Gazza M]

I've got pods on my ZRX - I'm pretty sure it's been set up properly on a dyno though as the carbs are the 40mm ones off a ZZR1100, and I have a custom exhaust (all done by the blokes before me).

Couple of threads here and here from the ZRX forum may be worth a read - ask them too as I don't really know how much extra setup will be required.

But yeah, they look the dog's danglies and make a sweet induction sound too. Not to mention the extra space you get under the seat!

EDIT: having a look around people are saying you will almost definitely have to rejet, although baseline settings are fairly easy to find depending on which exhaust you have, then you can put it on a dyno to see what adjustments if any are needed.
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Past: '07 YBR125, '00 GPZ500S, '99 ZRX1100, '98 CBR600 track bike, '97 ZX9R
Present: '05 R6 track bike, 140 pit bike

[_Iain_]

You have a ZRX dont you?

If so, dynojet kit stage 3 required. Can work, has been done however the motor runs iffy low down, so not much good unless you're riding it hard 24/7. Workshops been having fun with a customers trying to trace this non existant fault, turns out it's a fairly common complaint.

Depends how you plan to use it really.
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Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[Hetzer]

I've read that the low-end issue is due to K&N needles being pretty shit. Ivans are highly rated and don't have the same issues.

Already seen those links, but thanks anyway.

Yes, ZRX.

I can do all the work myself, just not the fettling/fine tuning. Apparently the K&N recommended clip settings are well over-rich.
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[Wafer_Thin_Ham]

Bare intake trumpets look awesome on these. Probably end up with bits in your engine, which isn't ideal though.
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[temeluchus]

You will NEVER get the bottom end to perform as well as an airbox with pods, no matter how much you fuck with it.

Fitting a DJ stage 3 kit, getting it well set up will let the motor run OK and may even give you a little bit more power up top, but CV carbs don't work well with the turbulent slow air you get with no airbox when revs are low. You can drill the slide holes to be a little larger and that overcomes the problem a little.

I went down the same route with my GPz1100E (same engine) and put up with the slight performance hit low down as the ease of servicing is worth it.

If you are deadly serious and want to spend some money, Mikuni RS38, Keihin FCR39 or Lectron are the best bet for getting it running well with pods.
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[Fizzer Thou]

I fitted pods to the Exup and it has made a differance to the roll on power from about 4,000 rpm upwards but has lost some bottom end rideability despite the fitting of a Stage 3 K&N jetting kit

https://i666.photobucket.com/albums/vv23/WiNot_Rhencullen/Honda%20750/My%20bikes/20100611_1.jpg

On some bikes the slides are drilled,on others the springs are replaced.The design/flow rate of the Dynojet main jets are also differant to the standard Mikuni mains.But the biggest change are the needles,and this is where most of the development went into the kit.I had the Stage 1 DJ kit with the standard airbox but with a standard replacement K&N air filter,and this improved everything throughout the rev range-even improving the fuel consumption.As far as I can make out,it is the intake length which smoothes the air flowing into the carb from the airbox.When pods are fitted,this smoother airflow is disrupted,so causing the low rev stumble.According to the Exup1000 forum,some have gone back to the standard airbox because of this disruption.

Factory Pro also make jet kits https://www.factorypro.com/products/carb.html
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Always have a 'Plan B'

[evoboy]

I have foam 'pods' on my ZRX11, with ZZR cams, full Akra system and a DJ stg 3 kit.

It pulls perfect low down, so much so it reaches for the sky quite abruptly at 3k rpm if your a bit eager on the grip....but will also pull 5th from 30mph at very low revs, 2 up, without any hesitation what so ever.

When I got the bike, it was set to the DJ specs. It would judder at around 1/4 throttle. After chatting with temeluchus about it, I dropped the needles a notch and it ran perfect.....apart from the fact it would'nt rev beyond 7k...but that turned out to be poor pod filters that had a 'restriction' inside.

It fuels perfect IMO and is super smooth to ride....it looks and sounds far better aswell.
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APT Motorcycles

[temeluchus]

[Vincent]

Does the bike not run too well with the standard airbox?
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[Hetzer]

[Hetzer]

[Vincent]

I was reading about CR, smooth Bore carbs on the CB1100 forum the other day. A lot of septics spend a fortune on these carbs and I was surprised to find that better alternatives are out there for this particular bike, including using early GSXR1100 carbs which fit with very little alterations. It's done on the CBFs as the original carbs were suspect, especially if trying to use with a tuned engine.

They may look nice but fitting aftermarket carbs on a road bike can be a real pain in the arse, same with filters. I'd stick with something that's known to work with this particular bike then you shouldn't be back and forth to the Dyno trying to get it right.

Is there a turbo for the ZRX?
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[stevo as b4]

As long as your using big enough air filters spaced out enough from the carbs and fitted with bell mouth plates inside, I can see no reason why with enough tuning time and re-jetting that you cannot make individual air filters work well, and give decent carburation throughout the rev and load range.

It's the same with 2strokes, where people say it's a huge no no to fit individual air filters and bin the airbox. If the filters are big enough in terms of surface area and the end plate is sufficiently far from the carb mouth, then you should be able to jet them up to get decent fueling, you might not gain power or torque over running the std airbox, but with the right filters and the right dyno tuned setting up, it should end up rideable and smooth IMO.

[Hetzer]

[P.]

[Vincent]

£300(ish), would get you a set of these:-

https://page22.auctions.yahoo.co.jp/jp/auction/l214152171
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[Vincent]

https://i77.photobucket.com/albums/j71/Drewskovitch/lico_net_japan-img577x392-137748800_zps6d750ad4.jpg
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[stevo as b4]

You can't blame the big man for wanting to keep the character of a big angry snarling rasp, but just to have a bit more of it!

On a bike like the ZRX i'd go for high compression pistons and a big bore kit every time over a turbo! Once you start lowering compression for big boost Forced induction set ups you lose some low end torque and ruin the low down roll on response to an extent.

Big instant torquey grunt on a litre+ naked is where it's at. I'd not turbo anything that was not a long low slippery fully faired machine, with 200mph+ aspirations personally.

[P.]

Never ridden a ZRX, naturally though, I expect power from a litre bike.

[Hetzer]

[Vincent]

[Hetzer]

[Hetzer]

Well, the chap at PDQ says it's entirely possible for a bloke like me to drop the kit in per the instructions and get a perfectly well-running result without recourse to balancing or dynoing (so long as I don't fiddle with anything not included in the instructions).

Otherwise it's £180 for three hours' worth of setup on their dyno, on top of the £200 plus for the kit and pods.

He also says they remove Ivan kits to replace them with K&N stuff.
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"There's the horizon! Ride hard, ride fast and cut down all who stand in your way!"

[temeluchus]