YZ250F 2019 air box mods

styler690
Edited Date/Time 1/4/2022 3:26pm
Has anyone drilled holes in the top of their air box on a 2019 YZ250F just wondering if it’s worth doing I have read some people had been doing this and adjusting the mapping to suit cheers
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hughesyzf134 4/8/2019 5:27pm
4/8/2019 5:27pm
styler690 wrote:
Has anyone drilled holes in the top of their air box on a 2019 YZ250F just wondering if it’s worth doing I have read some people...
Has anyone drilled holes in the top of their air box on a 2019 YZ250F just wondering if it’s worth doing I have read some people had been doing this and adjusting the mapping to suit cheers
i got the twin air powerflow kit for mine made a big difference
swtwtwtw
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swtwtwtw 4/8/2019 10:30pm
4/8/2019 10:30pm
Yup. Pulls farther and harder mid to top.
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Stevehrc
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Stevehrc 4/9/2019 1:21am
4/9/2019 1:21am
swtwtwtw wrote:
Yup. Pulls farther and harder mid to top. [img]https://p.vitalmx.com/photos/forums/2019/04/08/337266/s1200_CA5FFA10_A777_453D_B5E7_0374C5FE1351.jpg[/img]
Yup. Pulls farther and harder mid to top.
In my opinion you could have made it look a lot cleaner. That looks rough in the photo provided.
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fourfourone
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fourfourone 4/9/2019 10:00am
4/9/2019 10:00am
swtwtwtw wrote:
Yup. Pulls farther and harder mid to top. [img]https://p.vitalmx.com/photos/forums/2019/04/08/337266/s1200_CA5FFA10_A777_453D_B5E7_0374C5FE1351.jpg[/img]
Yup. Pulls farther and harder mid to top.
that looks terrible. Some people just drill small holes on the side of the upper shroud
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Spudnut
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Spudnut 4/9/2019 10:23pm
4/9/2019 10:23pm
That screen Aintkwwpongas much dirt oitnas you think it is check your valves lol
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Spudnut
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Spudnut 4/9/2019 10:25pm
4/9/2019 10:25pm
That screen isn’t doing much might as well be an open hole for dirt to go straight to your airbox
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styler690 4/12/2019 4:25pm
4/12/2019 4:25pm
Thanks for input I have ordered a twin air power filter kit not happy with way standard filter seals either cheers
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sandtrack315
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sandtrack315 4/21/2019 3:20am
4/21/2019 3:20am
I have the power flow kit. Makes it easiest to ensure no dirt in the air box during cleaning too.

The white cover looks perfect.
Gordon_Daniel
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Gordon_Daniel 4/23/2019 2:35pm
4/23/2019 2:35pm
I got the No Toil air flow system and put it on. I have not taken a ride yet. But it was quite a bit cheaper than the twin air and does the same thing. I ordered a twin air air flow filter hoping it will mount on the no toil system. I am not a big fan of the no toil.
tpete115
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tpete115 12/8/2020 8:08am
12/8/2020 8:08am
Did the twin air work on the no toil system? About to order one and wanted to make sure they work.
Thanks
Rider 5280
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Rider 5280 12/8/2020 9:29am
12/8/2020 9:29am
There is power to be had with these airbox cover mods, for sure.

I saw the below dyno curves on the VHM site for testing their large-volume airbox covers made of carbon fiber.

The YZ450F benefits more than the YZ250F given its "air gulps" are nearly twice that of the 250F, yet they use the same basic air intake system. Stands to reason that less restriction benefits the 450 more.

Drilling holes is priceless ... literally.

Carbon fiber not so much, but oh so pretty.




mx317
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mx317 12/8/2020 10:49am
12/8/2020 10:49am
tpete115 wrote:
Did the twin air work on the no toil system? About to order one and wanted to make sure they work.
Thanks
Perfect fit. The only difference the Twin Air cage has a pin that goes through a hole in the lip of the filter and the NoToil does not have the pin.
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08r1dilla
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08r1dilla 12/12/2020 3:19pm
12/12/2020 3:19pm
Revs quicker on the stand haven't rode it yet tho

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Mr. Robinson 12/12/2020 4:57pm
12/12/2020 4:57pm
I honestly don't think dynos do these mods justice. They seem better when you ride them. They just come off corners and pull through the mid range so much better and you don't really see that on the dyno sheets. And yes, the 450 is insane compared to the 250.
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adam8781
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adam8781 12/13/2020 9:18pm
12/13/2020 9:18pm
i run a slater skins airbox cover and no toil powerflo kit on my 19 yz450, huge difference in power

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Ryan625
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Ryan625 12/14/2020 11:53pm
12/14/2020 11:53pm
I recommend either the twin air or no-toil kit. I went no-toil because of the price point, I hear the twin air filters fit the no-toil cage perfectly as well.

I also drilled some holes in the airbox to let it breath a bit.




mx317
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mx317 12/15/2020 10:23am
12/15/2020 10:23am
2021 YZ250F has vents
Rider 5280
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Rider 5280 1/4/2022 3:25pm
1/4/2022 3:25pm Edited Date/Time 1/4/2022 3:26pm
Matthew_Zielinski wrote:
Had a go today at my own style of mod. Came out alright 👍 [img]https://p.vitalmx.com/photos/forums/2022/01/01/525815/s1200_B9ED5773_873E_4E30_9A57_2200F42EE8F5.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2022/01/01/525819/s1200_0322EB72_B901_47AE_BF82_B0829CB37C98.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2022/01/01/525817/s1200_B69752E7_9532_43D9_ACE9_7C53EC5D5B55.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2022/01/01/525816/s1200_31E13C8C_2E9D_420F_B1FE_7B2F8998B578.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2022/01/01/525818/s1200_E7CCFBAA_2585_4FFA_B919_C36FEA710394.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2022/01/01/525820/s1200_F6451508_8829_49C6_9BF9_373A3F0DB015.jpg[/img]
Had a go today at my own style of mod.
Came out alright 👍





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