Pod filters question...

What's up everyone, I have a question regarding installation of pod filters on my bike. I have decent mechanical knowledge when it comes to cars, but I'm a newb when it comes to bikes. I have an '80 KZ750 that I'm looking to build into a bobber-style bike and wanted to swap out my air box for the pod filters, but I'm confused from what I've read here and other places about this. If I do install pod filters on the bike will it be necessary to rejet the carbs? I'm not looking to go crazy and spend too much money on the bike, just a few changes here and there so I want to make sure I wouldn't have to rejet the carbs or buy a kit.

Any help you experts could provide would really be appreciated. Please help a new rider out.

Thanks

Here's a picture of what I'm working with

Welcome to KZR!

Installing pod filters increases the air flow. So yes, you will need to increase the jet size in your carbs.
The average increase is about one or two sizes larger on the main jet, depending on type of pod filters (foam or guaze) and anything else that you've done or will be doing to increase performance.

I'm no expert but I did stay at a Holiday Inn back in '88. Just my opinion but pods are a PITA. You will most likely have to re-jet and then spend some time dialing in the carbs after. You could still experience some lean conditions with side winds and passing trucks from wind blasts. Also during wet weather you might have to cover them. Be sure before removing the airbox because taking that critter off is no fun. Re-installing it is a bigger pain if the pods don't work out. In my opinion them Japanese engineers were pretty good. Might be better if you installed a nice hi-flow foam filter in the original airbox instead. If you do a search of pods vs airbox here you should get an earfull er...eyefull of info.

I'm bobbing a CSR right now too. Seems like they were made for it. here is my project thread LINK
Good luck with yours!

Thanks for the quick replies guys...looks like I might stick with the stock air box then. Not looking to put too much/extra cash into the bike, plus I heard rejetting the carbs isn't the easiest or quickest thing to do either? Am I wrong?

Thanks again.

rejet is CHEAP..and Quick if not stripped...and you can do it without removeing the throttle cables

Z1 will have it done for less then like 20bux bud...2.75 a jet...

pods r 7.99 each

mine is a twin so its a lil easier and cheaper then the 4's

but people here deff. lean towards airbox...and its a good thing for most

i have pods on alot of my toys so its not a bother for me...

it does take tuneing time more them cash time...

Good luck

I had a 73 Honda 500 with pods. Ran like complete crap. Took the pods off and it ran like a different bike.

Also, you have CV carbs on that 80 750-4. I heard those are even harder to dial in than a mechanical slide type of carb.

You failed to mention if there have been any engine/ignition/exhaust mods, and if so what they are. If so, that needs to be taken into consideration as well. Bottom line, the stock airbox is better as it will allow less tweaking at the tail end. I run pods on my 900/1000/1000E2 and the stock airbox on my 1300 (guess that explains why the airbox is preferred...more bodies,less tweaking) Many jetting issues involved with the use of pods can also include needle clip repositioning. Sync (by guage) is still probably the most important aspect of the carb set up. As with any set-up, it's good to check compression/spark/etc. before messing around with the jetting. Always keep in mind that in a perfect world,books can tell you how to do it...it's not a perfect world and every machine has it's own characteristics. I've been rebuilding the old carbs for around 30 years and still have new experiences with them. If ya want a machine that with less carb maintenance/tweaking, stay with the box. If ya want to learn about the principles of carburetion and get the "cool factor", go with the pods. It's really a matter of preference.

Spyder

I've had K&N pods on my 1980 750/4 E1. I bumped the primary main jets from stock 62 to 70 and the secondary mains from stock 125 to 140 and it ran well. I also had a 4 -> 1 exhaust. Jets are about $2 each from Z1 Enterproses.
Overall though I prefer the airbox for the lower speed performance. Pods do look cool though

You will have to rejet for pods and it will never run right again. It might run OK, but the airflow won't match the needle taper anymore. The stock air box also "regulates" the intake flow and "buffers" it from external effects like wind changes. You will also lose the rear mechanical support for the carbs which you will have to add or the intake manifolds will fail over time.

hello to all. This is my brothers bike and i am helping him with getting it running. This weekedn we got it running but it would die. Turns out his smog valve and all that junk was bad and clogged. So we proceedd to remove it all and will be pluggin up the holes from the valve cover this weekend.

Now my question is how much vacuum should the line going from the petcock to the carb have?

And his intake boots from the engine to the carbs should they also have some sort of vacuum ports?

The reason I ask is I did a little reading on here and saw that there are some that do have these ports and was unsure if when he got the bike maybe he got the wrong boots.

We got the bike to start and idle but as soon as you try to rev it dies out and also the carbs leak from the bottom ports. what is the most common casue to this? The guy he got the bike from said he had just recently rebuilt the carbs and had them synced as well.

Sorry for all the questions but I want to try and get this thing running for him ASAP so that he can ride with me this summer.

Ratty - just a suggestion, I would start your own thread.

The leak from the bottom is an issue with the float circuit not stopping the fuel from overfilling the float bowls.

Some boots have vacuum ports and some don't.

Not sure on the vacuum readings from the petcock, I would think a service manual would have that info.

ratty65 wrote: hello to all. This is my brothers bike and i am helping him with getting it running....

Hello, ratty65, and WELCOME to KZr!
We look forward to helping out with your brother's bike.

For better responses, would suggest creating your own New Topic to start a thread about the carbs on your brother's bike.
And be sure to include information about the make and model of the motorcycle.

Good Fortune!