[momo951]

I have seen those homemade modifications done to the stock airbox on many 400ex's. Like drilling holes on the lid, or even taking off the lid. I have always wondered, do these mods actually work? Are they even safe for your motor?

 

[300ex power by monster]

yes taken the lid off is safe to do i do it

 

[Billy250X]

You have to give the motor more air and fuel to make power.If you just give it fuel it will not open up to the full potential.I would recommend a K&N filter so that it's cleanable.With the opening you'll get some dirt in it.

 

[300ex power by monster]

yah i run open box and go through some deep mud u be fine as long as u clean it

 

[momo951]

what about drilling holes in the lid? has that been effective?

 

[300ex power by monster]

i dont know

 

[mud99]

I have a lid on mine and a K&N air filter. I see no reason to remove the lid. You can jet the carb and steal keep the lid on. If you want to remove the lid I would make some kind of filter to replace it with to keep most of the trash out

 

[TRX2fiveO]

Dynojet states for stage 1 jetting you leave the lid on for stage 2 jetting you remove the lid but aftermarket mods are needed eg. exhaust and k&N filter. drilling holes doesn't help much I have 3 lids 1 drilled 1 half cut-out and the last is stock nothing done. I personally run with no lid, but you have to make sure you have the proper set-up.

 

[Redracer]

Really depends on your riding conditions. K&N makes a great product, they will let more dirt through than a foam filter but they also allow more air to go through. If you ride extremely dusty condtions, stick with a foam filter and you are safe running open box. If you want to run a K&N I HIGHLY recommend a pre-filter. For muddy conditions, I would run closed air box. You do NOT want any moisture getting sucked into your machine.

 

[moto134]

id stay away from k&n motor killers unless you keep it very clean.

 

[TRX2fiveO]

Agree, I clean mine everytime I ride for any length of time.

id stay away from k&n motor killers unless you keep it very clean.

 

[Billy250X]

Deffinetally run a pre filter.It'll ketch the littler stuff the filter it's self won't.And I run with the air box lid modded.I cut inbetween the bracing and then only some of it.Probably about 3x3 inch sections.But I tried to let enough meat to keep it strong.

 

[300ex power by monster]

i run a k&n air open box no pre filter and i ride through some deep mud and creeks and mudpit it works just fine with out a pre-filter and i ride in sand to it does just fine without the pre-filter

 

[moto134]

i run a k&n air open box no pre filter and i ride through some deep mud and creeks and mudpit it works just fine with out a pre-filter and i ride in sand to it does just fine without the pre-filter

lol not for long!!!

 

[tomgodd]

I clean my K&N after every ride. I have 2 and I carry the extra with me if it is really dirty. I also have a stock airbox. If I was going to mod or something of that nature I would order an Aluminum airbox. It relocates the battery and It is a stronger box and they also have lids for them.

 

[300ex power by monster]

well I'm going to get a foam filter and i might get a pre-filter sooner or later

 

[moto134]

id like to have a aluminum air box but i wouldnt have anywere safe to put my alarm.

 

[tomgodd]

My buddy ahs a Alarm that is conected to his brake disc. I don't know anything about it other than its loud. I guess it has batteries.

id like to have a aluminum air box but i wouldnt have anywere safe to put my alarm.

 

[moto134]

mines just like a car alarm runs off the quads battery

 

[tomgodd]

we put one on a motorcycle once. also a remotestart. It was a big Honda 1800VTX or something of that nature. It was nice untill he tried to start it in gear. LOL!