how can i get more throttle reponse out of a 400ex???

[kawasakimojaverider]

im looking to get some snap out of my bike what kind of mods can i do to make it better?? thanks

[Fox17]

TRX450R. 

[Team Alba Z400 Rider 43]

I would say put a Keihn FCR 39mm Carb on there.

List the mods that you currently have and I am sure a few of the 400ex guru's will chime in and hook you up.

[VForcedave]

You can try hooking it to the back of my KFX700.   

[Fox17]

on a more serious note, a pipe, jet kit, filter, and ignition from moose or someone would help. if you already have those, call ATP and get it ported and polished and high comp piston, new cam, maybe a 440 kit. pipes are different too where they make power. you can look for someone to custom build a low-mid hitting pipe or the HMF Ironman is supposed to deliver a low-mid range hit. but, when yu look at these prices, it might be cheaper and easier to get a 450R.

[Team Alba Z400 Rider 43]

^^ I agree, if you haven't gotten to deep into it yet, you might as well part ways with it, and start new with something more powerful.

[FoxHondaRider]

remove the choke, add the curtis sparks advanced timing key.  do those and it will feel like a whole new machine, can you say no more bogging? lol  my 400ex runs so good the power is like instant i love it

[novadave]

ATP racing port job

[Fox17]

heck, if you want a dirtbike and can give me some cash ill trade you my 05 CRF450R for it. i need a quad to race on saturday. the ftr bikes race on sunday and i cant go on sunday. the CRF has way more throttle response than youll ever want. its scary fast. i love it but i want a 400EX or a 450R to race.

[Cosmo]

You can try hooking it to the back of my KFX700.   

Quoted for truth brother!

[billabongcr]

if you want quick throttle response, look into a moose cdi ignition mod. its plug in and play (if you dont have other mods that require jetting). my brute 650 did good wheelies before, but after putting my moose cdi on, itll stand up from a dead stop. not only that but it gives you more power all over the powerband. pair that with an exhaust system, jetting and a good air filter..youll be good

[mudnuri]

heck, if you want a dirtbike and can give me some cash ill trade you my 05 CRF450R for it. i need a quad to race on saturday. the ftr bikes race on sunday and i cant go on sunday. the CRF has way more throttle response than youll ever want. its scary fast. i love it but i want a 400EX or a 450R to race.

See if www.benjacobdesigns.com can rent you one. He is offering them (KTM's) up for the FTR races fully prepped with a pit crew for $200!

[kawasakimojaverider]

heck, if you want a dirtbike and can give me some cash ill trade you my 05 CRF450R for it. i need a quad to race on saturday. the ftr bikes race on sunday and i cant go on sunday. the CRF has way more throttle response than youll ever want. its scary fast. i love it but i want a 400EX or a 450R to race.

any pics? how much money are we talking? does it have a title

[Fox17]

heck, if you want a dirtbike and can give me some cash ill trade you my 05 CRF450R for it. i need a quad to race on saturday. the ftr bikes race on sunday and i cant go on sunday. the CRF has way more throttle response than youll ever want. its scary fast. i love it but i want a 400EX or a 450R to race.

any pics? how much money are we talking? does it have a title

it has a title. idk how much $. what year is yours? mods? title? heres a link to it on here:

http://www.atvflorida.com/forum/index.php/topic,34366.0.html

[kawasakimojaverider]

mines a 03 i think it has a title i just got it. all it has done to it is itp gncc front tires and itp holeshots xc's or something like that renthal bars procuircet t-4 pipe and its jetted i can send some pics if you want them it has nerfs but they need to be welded on or new brackets i just traded my banshee for it its only been riding about ten times its hole life well thats what the previous owner said anyway

[kawasakimojaverider]

 here she is  http://i150.photobucket.com/albums/s95/kawasakimojaverider/DSCN2162.jpg

[Fox17]

$1500 and your bike? if you think that that is too much, shoot me a offer.

[shogun323]

TRX450R. 

Aint' that the truth. I have always loved my 400ex until I rodes my buddies stock 450's the other weekend. The difference in power is night and day.

[megapurt400]

This is gonna sound way to easy but I did it when I first got my 400EX......ready?...............wait for it..............drop one tooth on the front sprocket. That's it! try it and see what happens.

The 400 comes tuned way out of its league with other 400's . so you have to give a little to get a little. Drop the front sprocket one tooth, increase the diameter of rim and tire in the back by one, get an open header, run a denso plug, open your air box, jet kit, stay with foam filter if you ride in sand a lot, adjust tire pressure, it is the little things you do to the 400EX that makes it a fun ride. Mine personally will not beat my buddies stock KFX400. I can out run a 450r in the long run but stay three lengths behind at take off. I keep up thru the trails though. spend the $17.00 and try it.

[Fox17]

This is gonna sound way to easy but I did it when I first got my 400EX......ready?...............wait for it..............drop one tooth on the front sprocket. That's it! try it and see what happens.

The 400 comes tuned way out of its league with other 400's . so you have to give a little to get a little. Drop the front sprocket one tooth, increase the diameter of rim and tire in the back by one, get an open header, run a denso plug, open your air box, jet kit, stay with foam filter if you ride in sand a lot, adjust tire pressure, it is the little things you do to the 400EX that makes it a fun ride. Mine personally will not beat my buddies stock KFX400. I can out run a 450r in the long run but stay three lengths behind at take off. I keep up thru the trails though. spend the $17.00 and try it.

it may come tuned down but its way more reliable than any others. id almost rather have one than a 450R cause of maintenance and reliability. i rode my buddies 400ex the other day and i really miss mine now.

[megapurt400]

I really agree with that. That is why I bought all Hondas. Im kinda a die hard for Hondas anyway.

[kawasakimojaverider]

its for sale fox17= i thought about the trade and cant afford the cash diference that your bike is worth

[Fox17]

im a die hard honda guy too. i thought about a yfz but i just couldnt do it.

how much you askin for your bike kawasakimojaverider?

[kawasakimojaverider]

make offer

[megapurt400]

I used to think the YFZ was all that and six bags of potato chips unitl I got a hold of the Suzuki450 with a cherry bomb. Hold on cause yer hair is getting peeled off your forehead! I love that thing. Its just not comfy like the YFZ and the YFZ is way more stable on power slides and jumps I think.

[Fox17]

I used to think the YFZ was all that and six bags of potato chips unitl I got a hold of the Suzuki450 with a cherry bomb. Hold on cause yer hair is getting peeled off your forehead! I love that thing. Its just not comfy like the YFZ and the YFZ is way more stable on power slides and jumps I think.

i thought you had a honda?

[megapurt400]

I have a Honda 400ex 2007 and a 2004 250ex (slightly modified)

[Fox17]

I have a Honda 400ex 2007 and a 2004 250ex (slightly modified)

oh, i guess the LTR is a friends?

[Carepak]

I had a 400EX and spent thousands on it back in 2001 when there wasnt any other good motocross machines besides the 250R. CURTIS SPARKS national 416 kit, 39mm FCR,ROLL DESIGN suspension, and CUSTOM AXIS shocks etc. After all of the money i spent,I gave up trying to make it compete with the new sport quads (yfz,trx450,lt-r).I broke down and purchased a suzuki LT-R and couldnt believe it. Almost instantly i was better,faster, and smoother than i ever was on the 400. Now with just a few upgrades (pipe,filter,c-bomb,ergos,fox shocks) i feel like i can be buried with this bike!!! But to help you with your respnse issue i can tell you what i did to correct my problem. first, remove the plastic side cover on the carb,observe the linkages. check to see if there is any freeplay between the slide/accelerator pump you may need to bend slightly to take up the slack.What you are doing is basically advancing the pump timing on initial throttle opening. Its a free and simple fix i have done to many 400EX and had good results. after that, just play with the fuel screw a little, go in 1/4 turn,out1/4 turn fine tuning.           

[kawasakimojaverider]

I had a 400EX and spent thousands on it back in 2001 when there wasnt any other good motocross machines besides the 250R. CURTIS SPARKS national 416 kit, 39mm FCR,ROLL DESIGN suspension, and CUSTOM AXIS shocks etc. After all of the money i spent,I gave up trying to make it compete with the new sport quads (yfz,trx450,lt-r).I broke down and purchased a suzuki LT-R and couldnt believe it. Almost instantly i was better,faster, and smoother than i ever was on the 400. Now with just a few upgrades (pipe,filter,c-bomb,ergos,fox shocks) i feel like i can be buried with this bike!!! But to help you with your respnse issue i can tell you what i did to correct my problem. first, remove the plastic side cover on the carb,observe the linkages. check to see if there is any freeplay between the slide/accelerator pump you may need to bend slightly to take up the slack.What you are doing is basically advancing the pump timing on initial throttle opening. Its a free and simple fix i have done to many 400EX and had good results. after that, just play with the fuel screw a little, go in 1/4 turn,out1/4 turn fine tuning.           

where are you located id pay you to do it if your not to far from me??

[Carepak]

i own a mechanic shop in margate, just bring it here and ill do it for you.