air box mods

i've heard of a very simple mod were the airbox flap that is controlled much like an EXUP valve is removed allowing more in in at low revs increasing throttle response.


anyone heard of this? anyone have any experience similar.

it apparantly gains about 5% down low.

My bike is old and stuff, but it was "breathing" through a hole about 1.5" in diameter... I removed the whole top of the airbox, fabricated some brackets to hold the air filter in, and it breathes much better now. As for your new-found mod, I haven't heard of anything like that before, but who knows?

Hey Aussie, if you don't mind joining new boards, try http://sbw.sportbikes.com, there's wealth of information there, and sportbike riders only.

and sportbike riders only.

yeah i joined, don't post there anymore cos i found out it was for riders only :banghead:

lol, you don't have to own a bike at the moment, all you need is the enthusiasm and will to learn the sport. granted that you get the bike later ;p.

Yea air box mods are becomming quite popular as a way to free up some lowerend torque, most airboxes (especially kawi's if i remember right) are very restrictive to airflow. I'm not sure exactly why they do it, but possible vehicle regulations pops into my head.

I would go to a forum dedicated to your type of motorcycle and ask there if anybody has done it, and what type of tools you need to complete the job.

ps. no I haven't done it to mine either, but it is on the to-do list

i got the idea from www.rrzone.com which is all blades from all years and has guys from the US mostly but alot from all over the globe.

from what these guys said (i wasn't an active member of the thread as i didn't know anything on the subject and stood back and let others ask away)
it is more of a track day/racer modification. as such i still can't see a big benefit for them as the rev range affected by the mod is lower than their average rev range.

my mechanic said he hasn't seen it but he still racers carby'd bikes. his take on it was that it would probably also allow more fuel in as the oxygen sensor would read the extra flow of air, hence the extra power output at low revs. as the revs get higher the air box would be open anyway so no change.


main problem would be excessive fuel consumption

only other problem would be emission control. if you get picked by for a sniff test, you'd fail very nicely:banghead:

hmmm need more info before i really stuff my bike. Mr Honda doesn't do stuff for no reason.......

I don't know about the regs in Oz, but bikes are so damn fuel-efficient I wouldn't think that a change in airbox ALONE would cause it to drastically fail an emissions test... but then again, who knows?

I think bikes are getting even with cars when it comes to fuel efficiency, sure sportbikes are more efficient than sports car, but take a corolla or one of the hybrids, and the only ones that can come up to mpg are 600s (corolla/civic) or ninja 250 (hybrids). All else, especially big bores, get anywhere from 20-34 mpg average tops. Plus bikes have smaller fuel tank capacity. When I started riding, I figure I was going to get 80+ mpg at least out of 600. I typically get 40 mpg on average, 45-48 if really conservative, and less than 40 on spirited low gears riding.

I get damn near 50mpg even... sometimes better if I'm stuck doing a lot of highway riding or the like... I have added just about everything performance-wise that you can short of a HIGHLY modified intake and other induction methods. Now, granted, my bike is still tame, but 50mpg is not bad at all.

as for our polution control, we are quite strict but not as bad as california.

when they test the bike, the rev range has the airbox closed and therefore is running "lean" (for want of a better word). if the box is open and its running relatively "rich" then the sniff test will fail. especially with an air cleaner/exhaust mod.

this is how it was described to me.

i'm keen to do it but have had some problems with fuel mixtures and foulage of plugs due to not reving hard enough. not keen on more problems