400ex intake

[russellsroost31]

http://www.ebay.com/itm/400EX-Velocity-Intake-with-K-N-air-filter-450r-ex-/300417560248?pt=Motors_ATV_Parts_Accessories&hash=item45f2482eb8&vxp=mtr
hey guys i saw this on ebay wanted to know what you guys thought bought it
now ik all you guys will say somthing about mud or water im not worried about that

[Stickman400]

Here's a couple old threads about it:
http://www.exriders.com/vbb/showthread.php?s=&threadid=489962&highlight=Velocity+intake
http://www.exriders.com/vbb/showthread.php?s=&threadid=494468&highlight=Velocity+intake

[russellsroost31]

i just took off the airbox sounds alot stronger in the mid range and top end but seemed like it my be a lil boggy in the bottom end

[JOHNDOE83]

try to up the jetting a bit more, now you have alot more air coming in and a little more fuel will wake everything up nicely.

[russellsroost31]

it has a 165 main jet it needs like a 167
ima just experiment a little bit first

[cheater13]

I plan on getting one of those before drag racing season starts. I know i'll have to change the jetting on it cause it'll be sucking in more air.

[russellsroost31]

well i rode it today and it was pretty impressive
i just ripped up and down the driveway a lil but it seem like a stronger pull up through the midrange and a lot better throttle response
i did a race start also and the front end just started to rise it seems alot better now i gues it will stay off for indoors

[Blodg]

The kit from ebay has a small diameter intake tube and I don't doubt that it increases velocity but I wonder if it would flow enough volume for a built engine. The stock air boot has a large diameter leaving the air box and tapers down to the carb. This in theory should flow a higher volume of air than the velocity intake.

From what I have read a higher velocity of air in any motor will improve throttle response and low end power but for top end power you need a sufficient volume of air. Maybe removing the air box and using the stock air boot as Johndoe has done might be a better option?

I have a narrow air boot (2 1/4" radiator hose) on my hybrid with 500cc motor and it is a monster on the low end but does not rev out well and I think it may not flow enough volume at high rpm's.

[gasguzzler]

I just picked up a 40mm HV (I'm guessing it's a HV model anyways) that was bored out to 43mm. It's inlet flange was too big for my stock intake hose, so I built my own intake with stuff I had laying around my garage.

The carb has a 2.75" flange and the alum. piping is 3" from a Powerstroke Ford intercooler system. Air filter was from a custom set-up I had on my 94 Lightning.

http://i604.photobucket.com/albums/tt126/kbsupercharged/airintakeproject.jpg

[Blodg]

That looks great gasguzzler! That should flow a ton of air with that huge filter and no air box.

I made by own intake boots on my hybrid but it has an aluminum air box was built for dual carbs so it has two small flanges (2 1/4") instead of one big one. One motor I have was built for two carbs but now I am running one carb so the filter that fits one side of the dual airbox is small. I should take some pics and post them on here for ideas on how to do a better intake system but I need to keep an airbox.

[russellsroost31]

that thing looks like it will rip your arms off for a 400ex!!!

[cheater13]

Did you have to rejet yours? And would a UNI filter work on the end or would i have to buy the whole velocity kit with the K@N filter?

[russellsroost31]

i just took my airbox off and im not a uni fan so im not sure
no i didnt rejet it it seems to run pretty good
it can have a little bog in the botom end but when it warms up it seems to run fine i havent really got to open her up cause of the snow

[JOHNDOE83]

you should at the very least tune your main jet using the www.jetsrus.com method for main jet tuning in the faq section.

[RNL]

I'm interested to know real world gains with this.

[cheater13]

Originally posted by RNL
I'm interested to know real world gains with this.
I'll be ordering the complete kit here in a few months for drag racing so I'll probably post the results after i get it rejetted.

But i would like to know some other people's opinions on it too. I know JOHNDOE said that it helped him alot but i think he got a custom one built for his drag bike that was similar to the velocity kit.

[RNL]

Originally posted by cheater13
I'll be ordering the complete kit here in a few months for drag racing so I'll probably post the results after i get it rejetted.

But i would like to know some other people's opinions on it too. I know JOHNDOE said that it helped him alot but i think he got a custom one built for his drag bike that was similar to the velocity kit.

It looks sweet, but not sure how it would be for trail riding.

[cheater13]

Ehh, it might not be too bad. If you can put a prefilter over that k@n that comes with it, your be good to go.

[russellsroost31]

mine never came with a prefilter

[marsig416ex]

I have an 02 Honda 416ex with a DG slip on and when I first purchased the bike it had the stock carb and the stock intake tube and a K&N fiter on it. When I first purchased the velocity intake I did noticed a crisper throttle responds using 170 main jet. Low end was not as noticeable but it did open the mid to top end. I do believe in the intake but I've notice more and more people not liking the K&N filter and turning to the Uni filters. I hope this helps a bit.

[cheater13]

So you can use stock UNI filters on this intake kit? And is the snorkel completely eliminated with a snorkel block off, or when you put the kit on, is it still supposed to be hooked up?

This is probably the last performance thing i can do to my engine besides boring it so i hope it helps out. I might buy one of those fan kits from a user on here that he custom made too cause mine runs pretty dang hot.