cutting holes in air box

[EXC-Rider]

I was thinking about cutting some holes into the side of my air box on the exc and put a wire mesh behind it mainly for visual affect more than anything but I would know if I had to re jet the carb as more air is flowing ?
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owned bikes: DR50, Thumpsta 110 , Honda CR85, Speedfight 100, Yamaha XT125X, Honda CRF450, Honda Hornet '07
current bikes: KTM EXC525 AKA the wheelie machine
A friend in need is a friend indeed but a friend with weed is better!

[P.]

Don't do it. Rain gets in. TTR had the same

[Irn-Bru]

Most likely will need rejetted. I read on the KTM forum when I had my EXC that the jetting from standard isn't too good regardless. Usually they are set up lean to get around EU testing.
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KTM 990 SMT & Suzuki DR-Z 400 SM

[Doovy]

Reminds me of this guy: https://www.motorcyclenews.com/MCN/News/newsresults/General-news/2010/May/may2710-shervin-an-internet-motorcycle-celebrity-is-born/

https://www.motorcyclenews.com/upload/267830/Untitled-1.jpg
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Yamaha RXS 100 > Honda CD 250 > Honda Hornet 600 > Honda CBR 600RR > Yamaha RXS 100 > Kawasaki ZX6R J2 > Yamaha FZ1

[stinkwheel]

Don't do it.

Cutting a hole in your airbox will probably make it flow less air, not more and will screw up the laminart airflow meaning it wont carburate correctly.

You are looking at making grief for yourself for no good reason. Don't mess with airboxes unless you understand what you are doing and why (or are acting on the advice of someone who understands).
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Irn-Bru]

[G]

[robs321]

Dont!

[Matt-]

I wouldn't do it unless you've seen some good solid evidence of it working and making a improvement on your bike.

A lot of people do it for 2 strokes, i personally did 2 small holes with some piping coming out of drilled holes facing down and it gave me slight improvement on my 0 - 60 time,However it did give me issues when it rained hard.

Plus if it doesn't work, your left with a bodged airbox.
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RIP jack (wheelie king), you will never be forgotten.
Current Bike's - Road Legal TZR 125 Pitbike, Aprilia SR50R 2010

[Drake]

do it faggot
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was: derbi senda, aprilia sx125, nsr250 mc16, cagiva mito, cb600 hornet now: mk1 bandit, KR1S, landrover series 3 light weight 2.5 petrol, 5speed box

[Blau Zedong]

Be fine, get it drilled.
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18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[nathan k]

As mentioned, you'll probably make the air flow worse not better. If you do it, you'll probbly need to upjet.

[rac3r]

Just remove the airbox and put mesh where it used to be...
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Bikes : 2006 CBR125R - 2004 Monster 620ie - 2004 ZX-6R B1H - 2005 Monster S2R 800 - 2011 Street Triple - 2009 Streetfighter 1098 - 2014 ZX-6R 636

[stevo as b4]

Can you just take the lid off the airbox or remove the intake silencer rubber/snorkle and do a back to back dyno test?

If more airflow is needed then such a test with A/F ratio monitoring would show it up both with differences to power and to the fueling.

Some bikes have a restrictive airbox and some don't. If such a test doesn't show any gains or show up big changes in fueling, then it's not needed and not worthwhile. You can also do a dyno run with the airbox intact and the filter element removed, and this would tell you if a freer flowing filter element would be worth fitting or not.

[G]

None of my 2 stroke EXCs have had a snorkel like that I don't think - and nor did my husaberg that I remember; I'm presuming the 4 strokes don't either.
The more trail/road orientated bikes do/have done.

[stevo as b4]

Yeah I'd say that makes more sense, as your not really worrying about intake noise levels on a competition machine.

The snorkel is often as about reducing noise and turbulence in the inlet hole to the airbox as it is about effecting performance.

I know on some bikes like the KMX125 for example that the airbox entry/snorkel is smaller than the size of the opening to the filter element. Modifying the airbox lid correctly and re-jetting seems to add 1-2bhp over std too.

[Fizzer Thou]

If you want to let more air in,fit a K&N air filter purpose made for the bike

https://pdq1.com/part.php?PartID=465&MakeID=17&ModelID=777&YearID=3260&Year=

You can buy performance modifying needles from Allens Performance
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Just talk bikes.What else is there?

Always have a 'Plan B'

[deadwolf]

[EXC-Rider]

seems like no is the answer

thanks
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owned bikes: DR50, Thumpsta 110 , Honda CR85, Speedfight 100, Yamaha XT125X, Honda CRF450, Honda Hornet '07
current bikes: KTM EXC525 AKA the wheelie machine
A friend in need is a friend indeed but a friend with weed is better!

[cimbian]

Did this on my TA and cured its asthma but created a ram-air issue at speed even though it was behind the main fairing.
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22PlusY
Current: Moto Guzzi 1100 Breva. Previous: Honda XL650V TransAlp
Bearded, Balding, Born again Buddhist Biker

[pepperami]

Cut up the air-box set fire to bike = no more problems





The only time modifying an air-box has worked for me was when I re-jetted my RD 250 lc many moons ago.
And! then I only drilled some holes in it so it could suck better/more.
And! that was only after having a bad experience with those stupid after-market cone filters???
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I am the sum total of my own existence, what went before makes me who I am now!

[woodyeee]

Reminds me of years ago when I added a pee-shooter powerpipe exhaust on my Suzuki ap50 it sounded much faster........ but it was actually 5mph slower

[Matt-]

[cimbian]

I drilled six 15mm holes in the front of mine but this was BEFORE the filter so the flame-arrest function of the filter remained.
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22PlusY
Current: Moto Guzzi 1100 Breva. Previous: Honda XL650V TransAlp
Bearded, Balding, Born again Buddhist Biker

[1cyl]

Mesh? Pah!
If you want to mess with airflow for asthetic enhancements, this is how it's done:
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