Drilling holes in 19-22 KX450 air box?

Joko
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Joko
Edited Date/Time 8/16/2021 5:52am
Has anyone added additional openings on the right side of the air box to gain a bit more power/throttle response?
Seems the only opening on the left side isn’t enough?
Thx!
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cmotodad
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cmotodad 8/14/2021 8:28pm
8/14/2021 8:28pm
The stock opening is pretty open. You can trim off some of the flange that goes into the airbox and maybe get a little more.
Polish Power
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Polish Power 8/15/2021 4:58am
8/15/2021 4:58am
Try the No toil super flo air filter kit. It makes the bike more responsive.
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Cygrace74
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Cygrace74 8/15/2021 5:38am
8/15/2021 5:38am
Polish Power wrote:
Try the No toil super flo air filter kit. It makes the bike more responsive.
Just know the bolt that comes with it is too long and won’t fully seal the air filter unless they’ve updated it from the last two I had
RF219
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RF219 8/15/2021 6:50am
8/15/2021 6:50am

I did mine like this
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Joko
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Joko 8/15/2021 9:20am
8/15/2021 9:20am
RF219 wrote:
[img]https://p.vitalmx.com/photos/forums/2021/08/15/505751/s1200_E4C02E8F_ABBE_4A01_A89F_F62909122A5E.jpg[/img] I did mine like this

I did mine like this
Did it help? Did you notice more intake noise?
RF219
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RF219 8/15/2021 2:16pm
8/15/2021 2:16pm
no I didnt notice anymore noise that I remember. Yes it ran better, but I also had a FMF 4.1 slipon and the kawi tuner so I could change the mapping a little.
Lloydcarter
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Lloydcarter 8/15/2021 3:52pm
8/15/2021 3:52pm
Can someone explain to me what the point of doing this is
wide open wally 8/15/2021 6:22pm
8/15/2021 6:22pm Edited Date/Time 8/15/2021 6:22pm
Lloydcarter wrote:
Can someone explain to me what the point of doing this is
Simply put, More air for the intake gives you better response/power gains. One of the reasons the Yamaha air box is up in front of the bike.
Lloydcarter
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Lloydcarter 8/15/2021 9:16pm
8/15/2021 9:16pm
Lloydcarter wrote:
Can someone explain to me what the point of doing this is
wide open wally wrote:
Simply put, More air for the intake gives you better response/power gains. One of the reasons the Yamaha air box is up in front of the...
Simply put, More air for the intake gives you better response/power gains. One of the reasons the Yamaha air box is up in front of the bike.
Does anyone need more power out of a 450? Haha
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Spudnut
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Spudnut 8/15/2021 9:45pm
8/15/2021 9:45pm
Lloydcarter wrote:
Can someone explain to me what the point of doing this is
Ram air effect Evil
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adamw21
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adamw21 8/16/2021 5:14am
8/16/2021 5:14am
On a 250f but I did this



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Kyle978
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Kyle978 8/16/2021 5:37am
8/16/2021 5:37am Edited Date/Time 8/16/2021 5:52am
Lloydcarter wrote:
Does anyone need more power out of a 450? Haha
I was thinking this when I opened this topic.

I spent the last two days riding extremely deep, wet desert tracks. 200 lb. A rider on a 21' KX450 with pipe/fuel/mapping.

I couldn't believe how well that bike plowed through the deep stuff and the power was just endless. I am blown away with how well these bikes put the power down.

No holes cut for me, I prefer a cleaner filter.
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Markopolo400
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Markopolo400 8/16/2021 7:53am
8/16/2021 7:53am
The left side number plate already has a giant hole. How much more air do you need.
burn1986
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burn1986 8/16/2021 8:14am
8/16/2021 8:14am
The OP was just asking how to do it and if anyone had, not if he should do it.
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Kawboy14!
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Kawboy14! 8/16/2021 8:30am
8/16/2021 8:30am
Markopolo400 wrote:
The left side number plate already has a giant hole. How much more air do you need.
Right!

As long as the openingfor the air box is bigger than the exhaust exit, no more is needed!
kNewc
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kNewc 8/16/2021 8:58am
8/16/2021 8:58am
RF219 wrote:
[img]https://p.vitalmx.com/photos/forums/2021/08/15/505751/s1200_E4C02E8F_ABBE_4A01_A89F_F62909122A5E.jpg[/img] I did mine like this

I did mine like this
Good idea! I might do this to my 21 kx250.
dkurtd
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dkurtd 8/16/2021 10:12am
8/16/2021 10:12am
Markopolo400 wrote:
The left side number plate already has a giant hole. How much more air do you need.
Kawboy14! wrote:
Right!

As long as the openingfor the air box is bigger than the exhaust exit, no more is needed!
You should probably do some research on why intake valves are bigger than exhaust valves before making such a statement.
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