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how to air box mod f4i

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Old Oct 22, 2007 | 12:56 PM
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Re: how to air box mod f4i
first time i have heard of this too... only thing i ever heard for F4i's was to tape off the airbox ram air inlet...


BUT... every F4i that i have ever ridden (At least 8 or 10 of them) felt like they have no bottom end and a nice annoying bog just off idle... if this helps that like people are saying then EVERYONE who owns an F4i needs to do it!!!
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Old Oct 22, 2007 | 02:45 PM
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Re: how to air box mod f4i
you can do it!!
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Old Oct 22, 2007 | 08:54 PM
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Re: how to air box mod f4i
Originally Posted by John LegionST

BUT... every F4i that i have ever ridden (At least 8 or 10 of them) felt like they have no bottom end and a nice annoying bog just off idle... if this helps that like people are saying then EVERYONE who owns an F4i needs to do it!!!
The peoples bikes you ride dont know how to maintain them. Mine doesn't do that.
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Old Oct 22, 2007 | 08:55 PM
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Re: how to air box mod f4i
Originally Posted by suicidl
i have never done this either

oh well i dont need it now
Damnit, I was counting on you to have some input on this. What good are you.
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Old Oct 22, 2007 | 09:02 PM
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Re: how to air box mod f4i
the clean air mod will give you better low end for two reasons

1- you don't get any of the hot oily air from the crank case in your airbox
2- by hooking the crankcase vent tube up to the clean air valve it creates a vaccum in the crank case and that is good for a few extra horse power and a couple foot pounds of torque
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Old Oct 22, 2007 | 09:03 PM
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Re: how to air box mod f4i
nick did it to his f4i that he has now
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Old Oct 22, 2007 | 09:04 PM
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Re: how to air box mod f4i
Originally Posted by old man roger
the clean air mod will give you better low end for two reasons

1- you don't get any of the hot oily air from the crank case in your airbox
2- by hooking the crankcase vent tube up to the clean air valve it creates a vaccum in the crank case and that is good for a few extra horse power and a couple foot pounds of torque
Well I guess I have plans for this weekend.

What size fittings?
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Old Oct 22, 2007 | 09:05 PM
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Re: how to air box mod f4i
Originally Posted by old man roger
nick did it to his f4i that he has now
I don't trust anything Nick rides lol
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Old Oct 22, 2007 | 09:05 PM
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Re: how to air box mod f4i
and if your tip over is disconnected and your bike is on it's side this mod will direct any oil that is pumped out to go directly to the exhaust port not your air box
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Old Oct 22, 2007 | 09:07 PM
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Re: how to air box mod f4i
Bike on its side...
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Old Oct 22, 2007 | 09:08 PM
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Re: how to air box mod f4i
lol........
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Old Oct 22, 2007 | 09:28 PM
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Re: how to air box mod f4i
I did it to mine, didnt feel any increase in idle power, but at least I dont have to worry about hydrolocking the motor.
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Old Oct 22, 2007 | 09:31 PM
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Re: how to air box mod f4i
OMR You know you **** I'm gona try the air mod. I'll let you know how it works.
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Old Oct 22, 2007 | 09:50 PM
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Re: how to air box mod f4i
it works any one who says it doesn't either has there original idle cable set wrong or soe thing because it makes more power with this mod .<thats a period..lol

tanus try turning up your stock idle cable
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Old Oct 22, 2007 | 10:00 PM
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Re: how to air box mod f4i
what in sam hell is going on here
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Old Oct 22, 2007 | 10:02 PM
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Re: how to air box mod f4i
question: my 929 has pretty much the exact same setup, as far as the PAIR hoses, and the crankcase breather... think this mod would help out the 929? (right now i just have the hoses clamped off)
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Old Oct 22, 2007 | 10:06 PM
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Re: how to air box mod f4i
having the hoses clamped of could be a bad idea because you can create pressure in your crankcase and that can be bad ........
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Old Oct 22, 2007 | 10:07 PM
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Re: how to air box mod f4i
I only did it becuase I dont want to hydrolock the bitch. Everyone knows how these things get when they're left running on the sides...
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Old Oct 22, 2007 | 10:09 PM
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Re: how to air box mod f4i
Originally Posted by Beto
I only did it becuase I dont want to hydrolock the bitch. Everyone knows how these things get when they're left running on the sides...
and that is a good enough reason in my oppinion
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Old Oct 23, 2007 | 05:04 AM
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Re: how to air box mod f4i
okay, i'm doin this mod right now

and holy **** i had oil in the airbox! ...from prolly the last 2 drops,

already disconnected all the hoses and took off #3.

my question is...


wat do i do with the T/valve thats already there? just leave it there? (its got a sensor in the back)...should i disconnect it at the sensor?
Last edited by DirtyToes; Oct 23, 2007 at 06:01 AM.
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