eleminate air box

[ommkevin]

couldnt u just put a k and n pre charger on the air filterand take oout the air box

[2004exrider]

they sell kits to do that, but id suggest just trying to run it with out the lid. It will have the same effect and be free.

jimmy

[ommkevin]

wouldnt itm be better to get rid of it b c u can suck air from all directions

[2004exrider]

no because it is opened up all of the way with the lid off, there is no restriction what so ever.

Jimmy

[ommkevin]

so ur sayin there is no gain by removing the air box

thanks

[wilkin250r]

I don't know about the 400EX, but I know on the 250r, you'll actually LOSE power by eliminating the boot between the airbox and carb. It helps streamline the incoming air.

Removing it and attaching the filter directly to the carb allows too much turbulence at the mouth of the carb, and it doesn't mix the fuel as well. You'll lose 2-5hp.

[JR3]

I konw of a couple people that did this and had no probs jetted perfect. But they only ride tracks and if the track is all wet and muddy i wouldnt want that. Im prolly gonna get the kit over the winter for my 400 to do that.

[smokinwrench]

Eliminating the airbox and intake on a 400ex helps power. The intake tube has too many bends to get good airflow.

Very true you don't want a clamp on filter at the carb, it creates air turbulance dyno can/will prove it as a lose of power but better then restricted airbox. Take the same filter and put it aobut 8 inches further back at the end of a nice smooth intake tube and youve added even more power. The long tube allows the air to enter the engine at higher speeds without all the turbulence.

http://cgi.ebay.com/ebaymotors/400ex-Velocity-Intake-with-K-N-filter-450r-not-dynojet_W0QQitemZ4585740514QQcategoryZ43979QQssPag eNameZWDVWQQrdZ1QQcmdZViewItem

I have one of these on my ex and I'm very happy with it. I did sacrifice my airbox and plastic tie it to the frame to help keep water out on the unexpected pond entries.

[QuadJunkies]

I done mine similar to yours^^^...

I havent ran an airbox for the last 2.5 years on my quad :) I put mine of the end of my intake boot not direct to carb.

I now will be running a aluminum box mainly because I wanted to relocate the battery. Ill be curious how much of a difference it will have with it vs. w/o it(wont have a lid) ...

i run no air box and mud dosent rilly get on the filter much. cuz in spring i get rilly muddy and i keep checking my filter and theirs only little speco on the filter.

[JR3]

Originally posted by smokinwrench
Eliminating the airbox and intake on a 400ex helps power. The intake tube has too many bends to get good airflow.

Very true you don't want a clamp on filter at the carb, it creates air turbulance dyno can/will prove it as a lose of power but better then restricted airbox. Take the same filter and put it aobut 8 inches further back at the end of a nice smooth intake tube and youve added even more power. The long tube allows the air to enter the engine at higher speeds without all the turbulence.

http://cgi.ebay.com/ebaymotors/400ex-Velocity-Intake-with-K-N-filter-450r-not-dynojet_W0QQitemZ4585740514QQcategoryZ43979QQssPag eNameZWDVWQQrdZ1QQcmdZViewItem

I have one of these on my ex and I'm very happy with it. I did sacrifice my airbox and plastic tie it to the frame to help keep water out on the unexpected pond entries.

link wont work can u try to get it to work cause id like to buy this kit if it is what i think.

[smokinwrench]

http://cgi.ebay.com/ebaymotors/400ex-Velocity-Intake-with-K-N-filter-450r-not-dynojet_W0QQcmdZViewItemQQcategoryZ43979QQitemZ458 5740514QQrdZ1QQsspagenameZWDVW


4585740514.......that is the auction number if this link doesn't work either.