installed factory air box today

otakar wrote:

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Dynojet jets are a totally different numbering system than standard Mikuni jets. Mikuni jets are measured in flow (cc/Min) Dynojet is measured in hole size. The relationship between them is not linear. The stock 998 motor with stock cams will not produce enough vacuum for the CV carbs to work properly with pods. A larger motor of 1100cc or larger runs beautifully with pods. There is a simple modification to the CV carbs to allow them to work flawlessly with pods even on small motors as little as 650cc. People just don't do the math before switching to pods. I remembered in high-school when guys would put Holly 850 double-pumpers on their stock 350 Chevy and couldn't figure out why they wouldn't run right. This bike has had pods on it since I built it and it runs like a raped-ape. Proper balance is the secret. The top picture it was a 998 stock "J" motor and lower picture it is a 1150 with .420 lift cams, 84 GPZ1100 head, oversize valves and porting. This bike started life as a 1981 KZ1000 CSR.
kzrider.com/forum/11-projects/169462-bui...z1150-from-a-csr1000

Man...perfect timing. I'm hungry and you showed up with baloney. Make me a sandwich already :lol:

That's not true at all about the 998 not producing enough vacuum to run pods on BS34's. In fact, I'll wager a stock 998J puts a stronger signal to the carburetors than your bike does with that 83 GPz11 head and that intake cam you're running. :evil:

Those heads have way too big intake runners. I've measured velocity in them. A stock J is better.

The whole concept of the CV carburetor is that the function of vacuum is what's supposed to make allowable, the use of a carburetor, for all around performance, that would be too large for such application in manual throttle slide form.

It's a matter of getting the slide lifting at the appropriate rate with the appropriate fuel calibration components. Vacuum signal strength is certainly tied to cylinder displacement but in the case of a 998 vs 1100....it's insignificant. I've installed many jet kits on 750's and 998's and they worked fine.

Throw a cam into the mix and you then start asking the carburetor to respond to a situation that it wasn't calibrated to respond to....hence, the stumble often associated with such scenarios. The thig is this...the air box proper isn't nearly as restrictive as people think it is & what restriction it does impose can be over come at the rear of the box without tossing the whole works out.

In situations where intake cam places a sudden demand for fuel as the bike comes on the cam, it can require a different needle taper, different springs for the slides or the slide lift hole drilled out in order to overcome the stumble. It's certainly not something for a guy that just wants to ride the bike and not be spending the time/effort/money to tweak things to perfection.

Sure, some guys love that and can actually do it. Many end up frustrated from a seemingly impossible problem to solve.

Not let's toss into the mix that the carbs are 30 years old. Just how good are they really after 30 years and who knows how many hacked attempts someone else has made to turn those things into fire breathers.....

Here's how much better POD's can make as bike run or not. We took our parts man's 900 Ninja with 34mm Keihin CVK carbs, Jet Kit & K&N filters, Supertrap slip on mufflers, lowered, strut in the rear, electric ignition kill on the shifter....NO wheelie bar. All internal engine pars were OEM Kaw.

The bike ran 10.6's all day long with him riding it. At the track one night it cooled off and the jet box was forgotten. He duct taped the huge K&N pods over, leaving abouy 1" of filter untaped. The bike ran it's number all night long. The air box would have delivered that much air to it.

how much you want for the filters??

Hey,just what we needed --- another pods vs. airbox debate. And in the white corner, the pods,look cool,sound cool,run-like sh--. And in the red corner,the stock box,looks crappy,no sound, and runs great.Lays your money down and takes your pick-gents.The action starts at any time.Me, I run the box with snorkel and a K and N and my old J bike runs just fine.No intention of putting pods on it,even though I have 2 sets in the garage.Anybody want some K and N pods cheap,pm me.Lol.bj

o no i think i created a monster lol started it up today god what a difference!!!!

bigkzfan wrote: o no i think i created a monster lol started it up today god what a difference!!!!

No not a monster, it's just pods vs airbox is the second most argued topic next to "what oil should I run " ?

I belong to severall motorcycle forums, and I just can't believe the widely varying opinions on this topic.
Opinion A: "I noticed a 10hp seat of the pants gain with my pods"

Opinion B: "pods suck and killed my midrange, and I can't get them tuned"

I personally favor opinion "B"

I can also tell you i've never read a single pod experience with credable true street dyno performance gain #'s . But I can tell you my eyes are bloodshot from reading the thousands of "I just added pods and my bike don't run right" type posts... so draw your own conclusion...

People ride for different reasons and like different things. Some people like to fiddle with their machines. Some experiment. Some like to frankenstein, the love to mix and match and make new sometimes better bikes and some like stock. Some wants soft cushy suspension some like stiff suspension and some want 2 X 4 suspension. Some people want color and some want any color as long as it's black. Some wants their armpit hair flowing in the wind and some like their chin on the tank. Some wants the bitch on the back and some wants their old lady to get her own bike. Some wants a big old heavy hunk of rubber on the back (or front) and some would rather it handle better. Some want a raked out stretched chopper or a stripped cafe racer and some wants a tourer with a full set of Samsonite Safari Luggage and a mast and sail. Some want loud piss everyone off/call the cops/point out that I'm a derp exhaust and some want tuned quiet power exhaust. Some couldn't care less. Some want to look cool riding and think they do. Ahem! Some just want a motorcycle that can get them out of trouble as quick as it can get them in trouble. And then there are those who like pods. Some like them for their very exotic look, some think they are easier to remove and replace the carb bank with. Some say they can get a HP increase somewhere in the power curve. Some like the sucking sound they produce. If you like them so be it. But they are a tuners bane, they get wet and they lean out with crosswinds and there are a lot of cheap and not so cheap crappy ones out there. + I don't know why you are taking off your carbs so much to make installing the carbs THAT much of an issue. Get some new boots fercrissakes fold them over and install the carbs! But most of all know what you are doing when you go cutting off that nicely engineered airbox. Do the research before you do it. Do a search. It may be the difference in enjoying a motorcycle and dumping one because you cannot get it to run right and are not willing to invest the time to make it ridable. Whew!

o yeah on plan b...

well,I was going to get get some pods, but after reading that rant, I think I'll stick to the airbox, sounds like a pain in the ass, thanks for making up my mind

What horrors you'll hear:

POD's
In a cross wind you will loose some power (true, but this can be minimized), cross wind will lean it out (true on the outboard to that side unless you take measures to minimize), hole a piston (sure will and you'll have 3 headed babies too), destroy your engine with all the junk that gets sucked into it (anyone riding their 1000 in the dirt these days?), it will drown out if it rains (true and false, if it pours like you-know-what-out-of-a-boot then true, if not you might get a pop now and then), it wasn't engineered as well as the air box (I thought PODs looked like they were made from a cardboard tube, paperclip and rubber-bands), it will boost your hp or torque a gazillion percent! (nope, not a big boost across the board, a better boost at points in the band and though some would say show me the dyno including me, I will give it to Muzzy and Eddie that there was a bigger reason to run stacks (the closest cousin of the POD) rather than a box for more than just weight reduction or the "cool" factor.), look at all the lean, pops, backfires, won't run right posts on KZR if you don't believe me (I say look at all the J engine liter bikes with CV's or any other bike with CV's and just hit your back button when the condemnation of the POD over the application of it starts up, it makes your head hurt much less)

Box
Kills performance (doesn't kill it, just flattens it), it's out of sight so it's out of mind you'll not service it enough (most here would not let this happen, however most of us can remember how bad it looked in there when we got the bike), it's just a rats nest in waiting (if you store the bike right in the winter then no, if not then it is an inviting place for Mickey Mouse to set up home so just set it up right), it's engineered to give the best air flow, the factory engineers know best (that is very debatable since it is also used for cosmetic reasons and is shaped to go around things that share the same cavity, more than likely it is a case of fill the cavity with it as much as possible once all the other components are fitted in the prototype, that makes it a best with what you have to work with component more than a precisely engineered chamber to optimize air flow into the carbs as some preach.), you'll just get tired of all the air leaks and lean issue with a box (really? just replace the damn rubbers if they are still available and quit yer bitchin), it will get you a better resale value from your bike (true, unmolested is the best, just be sure to keep yours serviced or if the buyer pops the top and see's Mickey in there then more than your jaw is going to drop)

Do what YOU want, you'll be happiest either way.

It took me a while to find this article, but I did ! It's a great read from Cycle World circa 1983 on the true pros and cons of pods. (keep your airbox handy after reading this article) :laugh:

api.viglink.com/api/click?format=go&drKe...f%20Free%20Lunch.pdf

For those with CV's it should be required reading for the pros and cons with PODs and a pipe. Slides weren't anywhere near that bad to tune, that is why my head starts to hurt every time one of these PODs vs box threads gets going as it gets made into one pile called carbs.

www.jockeyjournal.com/forum/showthread.php?t=64769 heres the Dynojet vs Mikuni chart