More air more power airbox mod

Well it's done following the tech article on modifying your stock airbox by member philcsand. I now have more air then I know what to do with. My biggest challenge is finding the ideal main jet size to match the huge increase of air moving thru the airbox. I have taken pictures to show exactly what I did to my stock airbox to make it much more free flowing. who needs pods this flows so much air pods don't stand a chance. I went from vm22 to vm26 carbs. the main jet has been increased from 105 to 115 and I feel is nowhere close to what is needed. in order to not get it to bog on acceleration had to block the bottom of the airbox and restrict the top down to 1 3/4 inch a mere 1/4 inch larger then stock. This is one free flowing airbox just how big can i go with the main jets? Obviously the stock head design can only flow so much air so I know it has a limit. does anyone know what a stock kz650 heads flows in cfm? going to order some main jets like 125, 130 maybe larger anybody have experience with this setup? All I know it this will be a screamer when I dial it in. Can't wait:woohoo:
s640.photobucket.com/albums/uu129/spudbudy/

what exactly is the airbox mod?

"what exactly is the airbox mod? "

Probably punching more/bigger holes in airbox tube that holds filter in place or cutting the tube shorter. Ed

Click on the photobucket link at the end of his post and you can see what he did. I think it is an excellent mod, and he should be able to get the carbs dialed in to work fabulously IF the exhaust system is not blocking things up too much.

The photobucket link really explains the mod. Looks excellent

How about the jet needle & pilot jet?

Seems like a great alternative to pods. I wouldn't want to ride in the rain using pods, or in gusty wind. This would solve all that. Great idea, though you have to tear apart your original airbox

What effect would this mod have if the VM 22 carbs were used rather than the other carbs? Perhaps if the mod was not as severe and the Jet size was increased and needle clip was lowered?

How much more air would this mod flow over a K&N high flow air filter?

Well I had vm22's and with the stock airbox setup was able to run 102.5 mains, 17.5 pilots and needle clip on the fourth slot from the top. did not try the smaller carbs after doing the airbox mod. really wanted to see how much of an improvement it would be over the smaller carbs. until I get it dialed in I'm just experimenting with different main jets until I can't go any bigger. from what I have read about K&N filters the gain is about 3% more flow so at this point it doesn't make sense to pay the difference for a K&N as compared to a stock paper filter. I'm am currently running 115 mains, 17.5 pilot jets and needle clip I think is in the 4th slot from the top. I will work on those after I get the main jet dialed in.

OK then, after with drilling some jets to test out for size. I feel I'm almost there. Right now I'm using @140 main jets still not right but getting very close. When time and weather permits again I will try and drill out the jets to 150 and see if thats all I can get outta this setup. My thinking is 150 will be too much but who knows I still have the bottom of the airbox closed off. This is just running with the top cut open to 2 1/4 inches. I still have a slight hesitation and bog at WOT but nothing like I had with the smaller jets. My best guess right now is going to be 142.5/145/147.5. Not too shabby for what amounts to essentially a free mod. I will keep you posted on what I end up with.:woohoo: