why the 04-05 carb?

[tEXas400]

my buddy has a 06 450R and says those carbs are better than the 04-05..

question is why does everybody prefer them over the 06+ models

are they easier to hook up or something

[flyboy1294]

Originally posted by tEXas400
my buddy has a 06 450R and says those carbs are better than the 04-05..

question is why does everybody prefer them over the 06+ models

are they easier to hook up or something

06+ are a 40mm FCR. They have better throttle response, no hot start to deal with, and the diameter creates a better intake velocity. It is a better carb imo. That's why the 06+ are $250 are the 04-05 are ~$150

[MO-EX-RIDER]

i thought the 04-05 carbs almost slid into the stock 400ex carb boot also

[honda400ex2003]

06+ are taller and will require much more extensive work to get it to fit. It is a flat slide so the it is more squared off and will need a much bigger adaptor to fit or lots of grinding on the boots. It can be done and is still pretty simple but just more than the 04-05 ones. The cable comes out differently and can interfere with the tank too depending on how you mount it. preference i guess. steve

[tEXas400]

So it can be done, i doubt its rocket science to get it to hook up

what would you guys prefer, the 04-05 or the 06+

i want the best possible performance for my bike

[honda400ex2003]

not sure about performance but i like my 05 one. more of a preference than anything. the 06 up is slightly harder to tune imo. both can be done and there are pics of how people did it on here, you just have to search for them. cant be too much different than the 05 carb to install. I would say if you have a 440 or something that really flows alot then the 06 will be better since it is bigger. it really depends on where you want your power to be not just the highest hp engine possible. steve

[tEXas400]

ya the motor im doing is really similar to that "wheelie" guys motor

87mm piston, with a +4 Stroked crank

I just bought a full Yoshimura exhaust, completely upgraded cooling system, I guess i just want everything to be as cohesive as possible, just pondering my options

your are quick to help steve...... scuba steve

[JOHNDOE83]

he 05 is best imo because regardless of other types of carbs or how the install is, its still a bigger carb with a 42mm opening.

The bigger the better...."go big or go home" as I always say.

[tEXas400]

ya im probaly gonna go with the 04-05, gotta guy that wants to sell me his, ive already spent $1400 on my bike and i havent even got into the motor much yet

still havent rode it either

[Pipeless416]

Originally posted by JOHNDOE83
The bigger the better...."go big or go home"

that's a horrible slogan to match up with carburetor selection.

[JOHNDOE83]

LOL...why do you say that?

[Pipeless416]

Originally posted by JOHNDOE83
LOL...why do you say that?

because just like a cam, the size of your carb depicts where the power comes on. smaller carbs generally give more low end and bigger carbs usually flow better in the upper range. the 05 450r carb is a nice middle ground that gives an all around gain. there IS a such thing as too big.

[honda400ex2003]

x2 it all depends on how he wants his hp and torque to be and where. steve

[NMills]

Originally posted by tEXas400

I just bought a full Yoshimura exhaust, completely upgraded cooling system, I guess i just want everything to be as cohesive as possible, just pondering my options

your are quick to help steve...... scuba steve

I do have a question.... Completely upgraded cooling system??? By what do you mean??? i did not think it was really upgradeable... a couple small things but not much... i don't mean to be rude... but i'm just curious what can you do to the cooling system....

[JOHNDOE83]

Originally posted by Pipeless416
because just like a cam, the size of your carb depicts where the power comes on. smaller carbs generally give more low end and bigger carbs usually flow better in the upper range. the 05 450r carb is a nice middle ground that gives an all around gain. there IS a such thing as too big.

Right, I think you miss understood my advice though.

when it comes to picking carbs for a 400ex its either a 39mm, 40mm, 41mm, or 42mm.

no one is buying a 44mm carb for the ex, so out of these options the biggest would be best, the 05 450r 42mm.

even you said the 450r carb is a nice middle ground, thats what I said also.... in less words...lol.

I think most dont understand how these carbs work in these applications also, the FCRs are flat slides, they dont nesescarily give more power in the lower RPM range, the flat slide gives more of a stab when the throttle is opened, the flat slide is like a wall of air, the round slide is more like a flow of air.

Because the hole is bigger, 42mm instead of 39mm or 40mm, the power increase is all over the RPM range but most noticable in the higher rpms because of the extra air flow.

The 39mm fcr and the stock carb arent much different in power increase, the flat slide gives the impression of more power, when it actually is throttle response that is increased.

[tEXas400]

Originally posted by NMills
I do have a question.... Completely upgraded cooling system??? By what do you mean??? i did not think it was really upgradeable... a couple small things but not much... i don't mean to be rude... but i'm just curious what can you do to the cooling system....

Ha no offense taken bro

Upgraded oil cooling system:

+1 Quart CFM aluminum Oil Tank

CXRacing 10 Row aluminum oil cooler

5.2" Spal Fan

Stainless Steel Braided lines all around

if thats not upgraded i dont know what is.. bout the most you can do for it.... CXRacing makes coolers for transmission, power steering, oil etc. for race cars

[Pipeless416]

Originally posted by tEXas400
Ha no offense taken bro

Upgraded oil cooling system:

+1 Quart CFM aluminum Oil Tank

CXRacing 10 Row aluminum oil cooler

5.2" Spal Fan

Stainless Steel Braided lines all around

if thats not upgraded i dont know what is.. bout the most you can do for it.... CXRacing makes coolers for transmission, power steering, oil etc. for race cars

four stroke tech style routing is definitely the most noticeable improvement you can make.

it's quite a bit more involved though. look into it if you're interested in keeping your engine cool.

Originally posted by honda400ex2003
06+ are taller and will require much more extensive work to get it to fit. It is a flat slide so the it is more squared off and will need a much bigger adaptor to fit or lots of grinding on the boots. It can be done and is still pretty simple but just more than the 04-05 ones. The cable comes out differently and can interfere with the tank too depending on how you mount it. preference i guess. steve
steve some of what you said is true and some is not.
its not hard to put them on. and im using my stock boot.
it it a flat slid carb not a vac. carb the vac carb has to pull vacum.
the flat does not. when you hit it it there no waiting for it to pull vacum thin go it just goes. i can help you set it up i have one on mine. heres a pic. the only adaptor i made was for the air box but if you move the air box up you dont need on.
<a href="http://s825.photobucket.com/albums/zz179/ericcrip/?action=view&current=dsc01673.jpg" target="_blank"><img src="http://i825.photobucket.com/albums/zz179/ericcrip/dsc01673.jpg" border="0" alt="Photobucket"></a>
<a href="http://s825.photobucket.com/albums/zz179/ericcrip/?action=view&current=100_4686.jpg" target="_blank"><img src="http://i825.photobucket.com/albums/zz179/ericcrip/100_4686.jpg" border="0" alt="Photobucket"></a>

[tEXas400]

so many choices, im going to be thinking about this one for awhile

[honda400ex2003]

Originally posted by ericcrip
steve some of what you said is true and some is not.
its not hard to put them on. and im using my stock boot.
it it a flat slid carb not a vac. carb the vac carb has to pull vacum.
the flat does not. when you hit it it there no waiting for it to pull vacum thin go it just goes. i can help you set it up i have one on mine. heres a pic. the only adaptor i made was for the air box but if you move the air box up you dont need on.


not really sure which part of the quote isnt true, since it is only 3 lines long but... is it just tilted a bit or is the pic crooked lol? I agree on the flat slide though and it looks like yours is def taller than mine and sits up higher. some guys have to modify the plastic deflector with the 05 carb others dont, i didnt have to. Did you with the other one? i have came across pictures where they said they had to grind the tank to get the 06 one to fit in enough while having it straight up and down. it looks like the adaptor is about the same you just have to make one. if you move the box on the 05 one you dont really need an adaptor either. you can also use a 450 box but i chose to go with the 400 box instead. steve

[honda400ex2003]

http://www.exriders.com/vbb/showthread.php?s=&threadid=421133&highlight=install

heres mine, it also has a sheet for making a spacer yourself if you have a lathe or cnc mill. the engine side slides in easy with no grinding but the intake side doesnt as was stated before. steve

[riotact]

Originally posted by tEXas400
Ha no offense taken bro

Upgraded oil cooling system:

+1 Quart CFM aluminum Oil Tank

CXRacing 10 Row aluminum oil cooler

5.2" Spal Fan

Stainless Steel Braided lines all around

if thats not upgraded i dont know what is.. bout the most you can do for it.... CXRacing makes coolers for transmission, power steering, oil etc. for race cars

Would you mind posting a pic of this?This is the exact same setup I'm gonna run on mine with the exception of running an oil line to the top of the motor and a 4" Spal fan.

Originally posted by honda400ex2003
not really sure which part of the quote isnt true, since it is only 3 lines long but... is it just tilted a bit or is the pic crooked lol? I agree on the flat slide though and it looks like yours is def taller than mine and sits up higher. some guys have to modify the plastic deflector with the 05 carb others dont, i didnt have to. Did you with the other one? i have came across pictures where they said they had to grind the tank to get the 06 one to fit in enough while having it straight up and down. it looks like the adaptor is about the same you just have to make one. if you move the box on the 05 one you dont really need an adaptor either. you can also use a 450 box but i chose to go with the 400 box instead. steve
steve go on ebay and look at a 06 450 carb. then look at my top pic of the carb.
you will see what i did to the carb. i had to cut the top off by the throttle cable it does not effect the carb.
if you look at the to carb you will see where i cut it.

<a href="http://s825.photobucket.com/albums/zz179/ericcrip/?action=view&current=dsc01673.jpg" target="_blank"><img src="http://i825.photobucket.com/albums/zz179/ericcrip/dsc01673.jpg" border="0" alt="Photobucket"></a>
<a href="http://s825.photobucket.com/albums/zz179/ericcrip/?action=view&current=dsc01674.jpg" target="_blank"><img src="http://i825.photobucket.com/albums/zz179/ericcrip/dsc01674.jpg" border="0" alt="Photobucket"></a>

this is a short cut click on it pic of carb on ebay.
http://cgi.ebay.com/ebaymotors/honda-450r-450er-stock-carb-_W0QQcmdZViewItemQQitemZ380249033077QQptZMotorsQ5f ATVQ5fPartsQ5fAccessories

[honda400ex2003]

ah lol i see how it is now, missed that before lol. that does make it easier to install. I couldnt leave that open where i ride though. lol it would be full of rocks and water. good idea there though. is your still turned a bit in the boot? steve

[tEXas400]

Originally posted by riotact
Would you mind posting a pic of this?This is the exact same setup I'm gonna run on mine with the exception of running an oil line to the top of the motor and a 4" Spal fan.

ya man, i am going to the shop tonight so i will post some pics up of my set up,

i havent installed my SS lines yet because im waiting on a fitting but i will show you

if you get that CXRacing cooler your gonna have to make a custom bracket to mount it

[tEXas400]

No thinks on the Four Stroke tech, all they do is run another cooler in line with the stock one, i already got a aluminum cooler that has a core size of 9.75x5x2 inch... only got one but it has more cooling power than the 2 run inline together

It,with the bigger oil tank fill up the space perfectly -- with my cooler i had to get a little more custom on the lines, which cost me a little bit of change but it was big enough to perch the 5.2" fan on ((i didnt have to cut the shield under the gas tank))

This cooling set up will look way cleaner, and be way more efficient than the four stroke tech

I will get a thread with pictures on my setup





Originally posted by Pipeless416
four stroke tech style routing is definitely the most noticeable improvement you can make.

it's quite a bit more involved though. look into it if you're interested in keeping your engine cool.

[Pipeless416]

Originally posted by tEXas400
No thinks on the Four Stroke tech, all they do is run another cooler in line with the stock one, i already got a aluminum cooler that has a core size of 9.75x5x2 inch... only got one but it has more cooling power than the 2 run inline together

It,with the bigger oil tank fill up the space perfectly -- with my cooler i had to get a little more custom on the lines, which cost me a little bit of change but it was big enough to perch the 5.2" fan on ((i didnt have to cut the shield under the gas tank))

This cooling set up will look way cleaner, and be way more efficient than the four stroke tech

I will get a thread with pictures on my setup
you might want to look a little closer. FST style coolers tap into the oil passage going to the cam/head. it's an auxilary cooler which delivers cooled oil to the top end. IMO, a large capacity oil tank is a waste of money.

[tEXas400]

there is a line going to the head already from the oil tank

[Pipeless416]

Originally posted by tEXas400
there is a line going to the head already from the oil tank

i don't think that line feeds oil. the passage im talking about feeds the cam lobes..

Originally posted by honda400ex2003
ah lol i see how it is now, missed that before lol. that does make it easier to install. I couldnt leave that open where i ride though. lol it would be full of rocks and water. good idea there though. is your still turned a bit in the boot? steve
yes we where taking it off at the time to add the nos. so in that pic it was. but the carb set up right.

[riotact]

Originally posted by tEXas400
ya man, i am going to the shop tonight so i will post some pics up of my set up,

i havent installed my SS lines yet because im waiting on a fitting but i will show you

if you get that CXRacing cooler your gonna have to make a custom bracket to mount it

Brackets are no problem to make and thanks :cool: