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View Full Version : ZXR 250.... how do i bypass the hose from the carbs that goes to the airbox?


skidMark
17th November 2007, 00:50
on my zxr 250a there is a hose from the carbys to the top of the airbox...which is like a vacuum / suction hose....the problem ive got is i want to put a pod filter on each carby. but i know if you take the hose off it runs like crap because it has an airleak from the hose being off...but if you block it off the bike will not rev over 8 k

i could just put the pod filters inside the airbox...but that sucks lol

the only thought i have had is to hook the hose with a t section hose splitter and put it onto one of the intake manifold vacuum hoses (that goes to the fuel tap to vacuum it open to let fuel flow through the main fuel line...

do any of you know how to bypass using this hose...? it's driving me nuts knowing i cant put pod filters on cus if this silly hose...and it's been rejectted rich enough for the aftermrket muffler and poddys... so it runs like crap..and no way in hell i wanna muck around with jets again.... because i want poddys...more air = go faster yup yup yup...

cheers in advance : mark
Pancakes
17th November 2007, 23:25
At least you've got 6 months to work it out eh! Bonus!

Is it the vaccum advance or what? get crafty with a T junction and plumb it in? You'll lose more torque than you'll make extra power with naked pods. Get an insert for your airbox.
skidMark
17th November 2007, 23:41
At least you've got 6 months to work it out eh! Bonus!

Is it the vaccum advance or what? get crafty with a T junction and plumb it in? You'll lose more torque than you'll make extra power with naked pods. Get an insert for your airbox.


also would have to ditch the ram air....

but it's been rejetted so hey no harm in throwing some poddys at her for the sake of 60 bucks eh
Pancakes
18th November 2007, 00:38
Yeah cos for $30 each they'll be shit Mark. Get a washable panel filter and customise the 'box to fit.
Squiggles
18th November 2007, 21:45
Wouldnt it be better to make the box larger to get more air? Dont pod's restrict the airflow in a way, making the choke point closer to the carbs (thus less air between them and the carbs which can be used) or did i completely misunderstand that/it only really applies to the big twins and the big gulps of air they take in (read on tlzone) :(
skidMark
18th November 2007, 21:59
more air = more hp ...u dnt want more fuel in an engine you want more air...more air = go faster lol....

**hmmm could run no filters..... :D**

just gotta figure out this bloodey hose....
98tls
18th November 2007, 21:59
Pod filters will do nothing but cause you grief mate...........take it from an old ex pod filter expert,:mad:
Pancakes
18th November 2007, 22:00
He's a boy racer Squiggles. He wants Pod filters and induction noise at the expense of power/rideablilty.

They really are tuned well from factory on most bikes. Look at cars too, all the funny shapes etc hanging off the induction, looks pretty deliberate eh Mark?

An airbox is normally tuned so after a cyclinder takes it's share there is a slight vaccum, the vaccum causes air to be sucked into the box and air (as viewed from a fluid dynamics perspective) has mass. The airbox ends up with some positive pressure just at the right time for the valve to open. Real similar to gasses cooling/contracting in a scavenging exhaust system. In the case of Marks bike it's fairly revvy so the inlets and stroke are probably suited to high rev power and the intake and pipe are tuned to add mid. He may (probably will) make more top end with Pods and pipe (as the jets have been done) but will have a hole in the mid range and as it's a 250 will be a P.O.S. to ride.

Mark how did you get the jets right BEFORE the mods were done? You don't even know what filters your getting yeat and as you sound like your not spending much they'll be paper shit ones. If your making a race bike (low K's, non-road use) why don't you leave the box and run no filter?
Mountlocal1
19th November 2007, 06:47
Go for a bigger/modified airbox mark. I was guna do a pod conversion a few years back and had my bike rejetted etc. Every single person I asked said do not do it. Causes endless problems and she will never run right. I know a guy with a bike like mine that did the pod conversion. We have exactly the same mods bar the intake (I have a bigger DNA out of a GSX1400) and my bike uses less gas,goes faster, has more torque and never misses a beat.

Wana go faster? Wait till you have your full and buy a bigger bike. Easy
Vagabond
19th November 2007, 08:02
Wana go faster? Wait till you have your full and buy a bigger bike. Easy

:niceone: Totally agree and while you at it get something decent like a HONDA!:spanking:
MSTRS
19th November 2007, 10:54
more air = more hp ...u dnt want more fuel in an engine you want more air...more air = go faster .

Not necessarily so....
More air - without more fuel = lean = meltdown
Pancakes
19th November 2007, 11:41
........Wana go faster? Wait till you have your... licence back
...and buy a bigger bike. Easy

And stop driving that work truck, you look dodgy and are bound to get stopped. For your own sake. A judge would love to go to town on you I bet and with your record and driving while disqualified. Life will be worse not better.
skidMark
21st November 2007, 11:00
:niceone: Totally agree and while you at it get something decent like a HONDA!:spanking:
bastard....looked at the rear of ur honda way to long......but does it make me gay that i was pushing so hard chasing your rear?
bungbung
21st November 2007, 13:23
You can do pod filters, but no one will be able to see them. What about a coby muffler instead?
skidMark
21st November 2007, 13:53
You can do pod filters, but no one will be able to see them. What about a coby muffler instead?


nah already has a zx9r racecan...i'm gud lol
Pancakes
21st November 2007, 20:09
You can do pod filters, but no one will be able to see them. What about a coby muffler instead?

Blow-off valve first, then zorst!


bastard....looked at the rear of ur honda way to long......but does it make me gay that i was pushing so hard chasing your rear?

Thats not what makes you gay bro!


heheheh jokes
Vagabond
21st November 2007, 22:03
bastard....looked at the rear of ur honda way to long......but does it make me gay that i was pushing so hard chasing your rear?

:sweatdrop looking at my rear! Chasing my rear! :Oops:

Next time I come across you on the road I'm totally outta there!:whistle:

and they say Honda riders are ...............
The Pastor
21st November 2007, 22:43
Can we keep this on topic? I'd like to know about this as well.
Pancakes
23rd November 2007, 23:54
....look.....the rear of u......to long......does ... make me gay......i was pushing so hard.........

...........................
skidMark
24th November 2007, 00:01
:sweatdrop looking at my rear! Chasing my rear! :Oops:

Next time I come across you on the road I'm totally outta there!:whistle:

and they say Honda riders are ...............


yeah getting outta there worked out well for ya last time ddnt it...

having a 250 chasing ya going yeah cmon ya old coot :buggerd:
Vagabond
24th November 2007, 01:16
yeah getting outta there worked out well for ya last time ddnt it...

having a 250 chasing ya going yeah cmon ya old coot :buggerd:

:girlfight: You just lucky that I did'nt give it heaps on the straights!

It's always more fun when up close an personal:crazy::whistle: