SIMPLE MOD MAY SOLVE POD TUNING HARDSHIPS!

Hey guy been a long time since i have been on had surgery havent been riding. I have been playing around with the pods and have figured a few more things out. The kidney hole can't be restricted in anyway it need the air valosity in order for everything to run correct. it needs that pos pressure in order for the functin right. I have make insert and everything but restricting the hole any effect the way the bike will run when you use the inrichment when warm up. the bike iwll not pick up engine speed. what i have done is the following. i used the boots off of the air box. they fit my pod perfectly. The grove that was used to hold them to the box is the grove that my pods attach to and then they just attach to the carba normaly. there is a slight clearance problem with the outside pods but i can live with that. that is what i have come up with. Im in the mix of rebiulding all my carbs alot of smal problems... (throttle shaft seals were shoot) once i get all the parts i will get back to working on this problem.

 

So, really what's basically happened after all this time & effort is, that we discovered that the simplest, cheapest & quickest method to eliminate/minimise the effects of POD induced turbulence affecting the slide-lift/air jet's air supply, is to utilise Yamaha's original velocity-stack airbox rubbers.... Kinda a bit like Streetbrawler originally did way back when? :?

And this still doesn't account for the fact that POD's improved PEAK mass airflow over the stock airbox would still require a larger main jet to provide stoichiometric mixture at WOT heading to peak revs....

*runs away swiftly after booting hornets nest* :twisted:


#please note before your flame attack, the author does not detract from anybody's ideas/theories or testing whatsoever & in fact humbly admires the hours of thought, research & effort put into attempting to find solutions for those who insist on running pod filters for whatever reason that may be, but is merely stating the facts as they are at this moment in time, that if you fit pods, "you're gonna need to rejet"# :wink:

 

Funny I posted that i had done the pod to boot set up after a deep conversation on the phone with rick back in 2008 No response I just thought everyone thought i was crazy. I will say it again Pods, High flow slip-on mufflers #126 mains #43 pilots shimmed needle .050 Pods attached to factory boots. 10,000 miles later still put a huge grin on my face when i get on that little blue rocket. Enjoy the ride people it doesnt last forever

 

Whomever is acredited with being the first to attatch the stock boot to the pod matters not, what matters is that it is above all the best solution to date.

 

I think a set of the Racing Velocity Stacks would help Narrow and Accelerate the Intake Stream helping the alleviate the Lean Condition.

But at $600 -to- a Grand, ... you might as well pop for the Fully Adjustable Keihin Carbs or a set of Carbs off from a Kawasaki Police Bike.

No matter which way you go, ... the price is going to way-up there!

http://www.carbparts.com/keihin.html

The Keihin Carbs are going for Multi-thousands of Dollars on Ebay.

http://www.ebay.com/sch/i.html?_from=R4 ... rbs&_sop=3

 

oh my god! why are those so much? whats so special about those carbs?

 

And then why would I buy carbs that expensive if I could simply use stock carbs, with stock boots and pods, with some specific new jets, all of this pretty cheap, like southpaw suggests?

 

And to think I'm happy with connecting a stock airbox to the stock airboots and connecting them to the stock carbs with the stock jets. If I want a faster bike, I hop on one of the others. If I want more powerful ride, I just hop on one of the others.

Yup.....as I've said before- I have a set of pods, too.....they sit right on the shelf, purty as can be. All brand new and stuff, right in their brand new boxes.

Dave Fox

 

They're primarily, ... Racing Carbs.

The faster you want to go, ... the more it's going to cost you!

 

You must be mad! Why on earth would you do that when you could have hours of fun diagnosing "ignition problems" that turn out to be fuelling glitches caused by those shiny new pods?

For the sort of money those carbs make you could go faster on another bike than any XJ is ever going to do with those carbs fitted (cheaper to go 190mph on a stock old 'busa than it'd be to fit them to an XJ and do all the other mods to reach that sort of speed.

I wonder when people will stop trying to make a race bike out of a 30+ year old shaftie? Maybe we should drill our cranks next :roll: :lol:

 

So the stock rubber joints would reduce the wind tunnel effect?

Just a thought seeing as I have read many of the pages but Not all damn 21 ,

Has the thought of a baffle inside the pod been brought up?
Just like a 1" thick "X" or something made of tin to break the wind tunnel up? Or am I not understanding the tunnel concept correctly.

Just a thought!


I bought my xj700 with pods , bike runs stupid rich, im working on it.

 

It's not a "Wind Tunnel effect, per se.

The Boot acts as a Velocity Stack.
The Boot has a narrower Inside Diameter.

The AIR drawn through the Boot takes shape.
It becomes a column of dense, Un-turbulent, air; accelerated to perform a vital function.
Reducing the PRESSURE at the Top of the MAIN NOZZLE (Emulsion Tube).

With a Low Pressure at the Nozzle's Exit Orifice; MAIN FUEL JET supplied FUEL is Siphoned into the Air Column.
Additional AIR from the drilled orifices surrounding the NOZZLE contribute greatly in Siphoning the FUEL.

Without the Boot, INTAKE AIR Supply is much more Turbulent.
The AIR is less compact.
The Volume lacks speed and shape.
LESS PRESSURE reduction at the NOZZLE Exit weakens the Siphoning action.
The Bike runs Lean.

Various Jet Kits are available offering to alleviate performance related issues.

Search "PODS" in the Forums.
We should have initiated a Hall of Fame for the various designs, many with photographs, that Members developed searching Intake nirvana.

 

If it's running rich, your carbs have likely been "modded" either by rejetting or somebody may have drilled the jets.

 

Agreed. When I crack them open I'll be sure to go the extra mile and write down jet sizes and inspect them for drilling. I definitely smell a bit of gas in the oil. Lots of factors to rule out still. My enrichment stalls the bike.

Lots to do, little time to do it .

 

In two weeks I'll be back stateside to greet a cosmetically challenged Seca with a clean power plant but the rest of her needs some serious love and some new gasketry... I decided to get pods.

May God help me. 8O

 

Hi there guys, can anyone tell me if the gears in a XJ 650 are the same as an xJ750
Thanks in advance

 

sorry I posted into the wrong place, will get the hang of this one day

 

ya i like my keihins, stock boots, green foam and mens dress socks,black hair ties under $5. go ahead and call it ghetto, seems to be working great. However I am modifying a kz stock air box with an automotive air filter cut to size. with mold rubber and masking tape over. the rubber pours around the edge, allowed to set then peeled the tape up. somewhat replaceable. still looks like crap, bondo and paint. my socks just go right in the laundry.

 

After 18 months +/-
And 22 pages

This is what all the discussion produces.

So with this being the only testing done.

Can we conclude that the original theory was incorrect, and that by far the simplest way to adapt the bike for the use of pods is to use the original airbox to carb boots to correctly shape, and deliver the correct airflow into the carbs?

Velocity stacked pods (stock airbox to carb boots).
Rejetting Required!!

Ghost

 

Anybody know of a simple alternative to the airbox rubbers? Will a length of hose do the job? Will stacks from a different bike fit?

The PO of my Seca proudly told me how he'd fitted new pods before putting the bike up for sale, the box & rubbers are long gone and spares are non-existant here in the UK

I'm loving bringing this one back from the dead and I want to get it as good as I can