400ex questions?

[TheAwesomehonda]

Ok i have a few questions that i'm sure yall will be able to answer. First i have 450r front shocks on my 400ex and i'm wondering if they will conflict with air scoops? Second I want your siggestions on what full under body skid plate is best price and best quality for the ex? Third is i'm thinking about buying a 450r carb and i want to know what can be used for the spacer between the carb and intake boot coming from the air box or do I need to buy the one that zrpilot makes because $53 is very steep for a little peace of medal.So what have u guys used? Also wondering how uses like the UM racing alumium air box? Thats all i can think of now so please comment and answer those questions.

[Thumpin440ex]

My UM scoops just miss the resi's on the shocks.. Not sure on the others makes.. The 04-05 450r carb will fit fine, just have to modify the intake boot.. Again it does on mine.. As long as the air box does not move the location of where the boot goes into it.. Pro Armor skids, Armadillo skids and others are nice, work well.. Um air boxes are nice from what I have read and seen. I am not using one, another make box I am using...


John

[TheAwesomehonda]

So what do u mean by modifying the intake boot? Yeah i'm probobly going with Armadillo skid plate because it is cheaper and has good reveiws. So u said your running any aftermarket air box? Which one is that?

[CJM]

You either need to enlarge the intake boot and move the airbox slightly closer to the carb or buy an adapter from ZR pilot-hes a forum member.

[TheAwesomehonda]

Ok so how can the air box be moved closed to the carb?? Hey i c u have the ccp stabilizer how do u like it? and i have the CFM oil tank to do u think it makes it run any cooler?

[01boneless]

it will make it run cooler but a stock ex dont need it. you will be glad you bought it when you start to mod more

[Thumpin440ex]

Not to disagree with CJM, but my air box keeps the orig location of the boot, I did nothing more then open up the end of it to slide onto the carb..



http://i6.photobucket.com/albums/y216/mangler0075/400ex%20build/carbboot.jpg

http://i6.photobucket.com/albums/y216/mangler0075/400ex%20build/carbboot1.jpg

John

[CJM]

Dremel+sander attachment is easier, but you can force the boot on if its heated slightly and pliable.

Thumpin-I know the stock airbox comes up a bit short, my adapter is about 1/4" longer than the normal carb end is.

[TheAwesomehonda]

@Thumpin440ex
What air box is that cuz that could be why your intake boot is long enough??

[Thumpin440ex]

Originally posted by CJM

Thumpin-I know the stock airbox comes up a bit short, my adapter is about 1/4" longer than the normal carb end is.

I could have sworn this box was the same distance to the carb as stock.. I can remember measuring for this when asking about this box.( but that was a year ago haha). You sir are correct.. Just did a quick measurement, damn if it isn't ruffly 1/4 longer in the front.. Hahaha

OP I am not sure who makes or made it. I think somebody one time mentioned nasty or something like that..

John

[slightlybent47]

A piece of 2” radiator hose and a few clamps works just fine for me. Cost about $5.00

http://i42.tinypic.com/wqt3ky.jpg

[TheAwesomehonda]

Thanks for the info guys that should save me some money.

[rockbrook]

Originally posted by slightlybent47
A piece of 2” radiator hose and a few clamps works just fine for me. Cost about $5.00

http://i42.tinypic.com/wqt3ky.jpg
Wait, so this can be used instead of the $50 piece from zRpilot? Im just really limited when it comes to money and i'd love to replace my old carb with a better 450r carb.

[Stickman400]

I'm sure there are lots of different ways to get around the length and diameter problem. ZRPilots adapter is just to make the whole install look cleaner. ^ That looks like it would work well as long as it didn't leak around the edges of where they meet.

[TheAwesomehonda]

HELP!!! I've got a big problem so today we got like 4in of snow and i was riding some. Then i drove into the shed and took off my seat and saw that my airbox is FULL of snow because i don't have the lid on. So i'm looking for siggestions on how to fix this problem. http://www.umracing.com/PDFfiles/UM%20Racing%20400EX%20Airbox.pdf That is a link to the air box i want to buy that i think will keep ou the snow. Please reply.

[01boneless]

take off the filter clean it good!!! dry it and oil it. drain and clean the air box and drain the bowl on the carb to get out water may even want to clean it and wipe out the air boot. and the um will not keep snow out unless you use a lid.

[Drfat400ex]

I bought a K&N Powerlid the other day. It keeps the snow out really good, the whole top of it was covered with it and after it melted I took it off to look and it was dry. They're kind of expensive for a little airbox lid but if you want you can get a FRAM filter and the stock lid and make your own.

[finsteratv]

I have a powerlid forsale if you're interested. I've never used it but it seems to be a popular/well functioning product.

[TheAwesomehonda]

Anybody have a UM racing air box for the 400ex???

[TheAwesomehonda]

Originally posted by finsteratv
I have a powerlid forsale if you're interested. I've never used it but it seems to be a popular/well functioning product. PM sent to u.

[CJM]

IDK I have an outwears lid. The kind where you cut your stock lid and mount thier piece. Yes its 50 bucks or so well spent imho. It filters extremely well, is water repellant and so far has held up great!

[TheAwesomehonda]

Originally posted by CJM
IDK I have an outwears lid. The kind where you cut your stock lid and mount thier piece. Yes its 50 bucks or so well spent imho. It filters extremely well, is water repellant and so far has held up great! Ok but i'm just really needing something to keep the snow out of my air box man idk what to get?????

[Stickman400]

Maybe you should just put the stock lid back on? You don't gain that much HP with it off. Or alteast put it on until the summer when you can take it off again. You're making a big deal out of an easy to fix problem.

[CJM]

Originally posted by TheAwesomehonda
Ok but i'm just really needing something to keep the snow out of my air box man idk what to get?????

That lid setup will keep the snow out. Its a thick nylon like semi waterproof material.

This is it: http://www.ebay.com/itm/EHS-Racing-400ex-air-box-400-ex-airbox-Outerwears-/360119474415?pt=Motors_ATV_Parts_Accessories&vxp=mtr&hash=item53d8cb18ef

I recall I only paid 60 for mine. You could easily buy the material off EHS and just make your plate yourself with 15 bucks of metal from home cheapo or lowes.

[400man]

Just get some duct tape and cover up the spaces on the sides and back of the airbox between the subframe/fenders and air box. thats what I usually do if im going on a ride and dont want a bunch of nasty in the airbox :p

[TheAwesomehonda]

Originally posted by Stickman400
Maybe you should just put the stock lid back on? You don't gain that much HP with it off. Or alteast put it on until the summer when you can take it off again. You're making a big deal out of an easy to fix problem. Hey man i would put on my lid but that means rejetting the carb each time. I don't know about u but with my hot and hmf full system exhaust i have big power gain with the lid off and 190 main jet.

[TheAwesomehonda]

Originally posted by CJM
That lid setup will keep the snow out. Its a thick nylon like semi waterproof material.

This is it: http://www.ebay.com/itm/EHS-Racing-400ex-air-box-400-ex-airbox-Outerwears-/360119474415?pt=Motors_ATV_Parts_Accessories&vxp=mtr&hash=item53d8cb18ef

I recall I only paid 60 for mine. You could easily buy the material off EHS and just make your plate yourself with 15 bucks of metal from home cheapo or lowes. So if thats true the um racing air box should do the same thing for 20 bucks more cuz it have the thick nylon material and then i could put my battery in the air box to and keep it out of the weather.

[CJM]

I suppose. But remember it just velcros to the box-mine is part of the box. I suppose you could do the same thing if you got a sheet of aluminum and made a real lid.

[kt1148]

This is exactly what I did to my lid, wasn't too difficult...http://www.exriders.com/vbb/showthread.php?s=&threadid=330349&highlight=airbox...keeps water and snow out,really good pre-filter

[TheAwesomehonda]

Ok guys new problem so i got the snow out of my air box and started riding today. i was riding for about ten minutes and every thing was working good. So i came out of a turn on my snow covered track and jabed the trottle but it wouldn't rev past about 5000 rpm but it would run ok. I'm wondering if this happened to any of u that how to fix it and what to check??

[01boneless]

like i said check the needle its happened to me before

[TheAwesomehonda]

Originally posted by 01boneless
like i said check the needle its happened to me before I know what u think boneless i already talked to u about i'm jw what other people think... lol

[99_300ex]

Possible your choke is on?

[TheAwesomehonda]

Originally posted by 99_300ex
Possible your choke is on? No it was off when this happened but I can't get the quad to start now no matter what i do but i think its flooding out.

[99_300ex]

Hmm. Is there gas coming out the overflow? I think I would take the carb off and check to see if the floats sticking possibly and just give it a good cleaning.

[TheAwesomehonda]

Ok well i figured out the not excelerating problem. The screws that hold the plunger (in the carb) to the linkage were viberated loose so when i pushed the trottle it wouldn't lift the plunger or move the needle in fact the needle was out of its hole and siting sideways in the plunger. So I found the screws and stuff and got it bolted back up.

[TheAwesomehonda]

Originally posted by slightlybent47
A piece of 2” radiator hose and a few clamps works just fine for me. Cost about $5.00

http://i42.tinypic.com/wqt3ky.jpg So my question about the 2'' radiator hose is how did u keep the intake boot from colapsing when u tighten the hose claps cuz mine does?

[TheAwesomehonda]

@slightlybent47
Are you sure thats a 2'' hose because i mesured the carb diameter is 2.49 so i'm guessing thats a 2.5'' but my question is how did you keep your intake boot from just calapsing. Can anyone else with the 450r carb on there ex show me how they fixed this problem. THanks