need help with choosing the right cam.

[Bigpoppa]

I have a 04 400ex and just installed a 440 BB kit new jug and 11:1 wossner piston. I'm running a evo big gun full exhaust and am toying with the I idea of a 450r carb. I've read reviews on stage 1 and 2 hot cams and am still not sure. then I read an article about using an xr400 stock cam or even better an xr stage 1. I'm wanting to build a trail beast. any and all info would be greatly appreciated.

[Stickman400]

I'd say a stage 2 HC for trails, have to what for the other guys on here who have a 440 to answer. Most of them have stage 3s, but I don't know how well that'll work on the trails.

[Bigpoppa]

I'm leaning towards a hc2 but would like to know all my options. and do I need an adaptor to install the 450r carb?

[TEXASOUTLAW]

I saw something about using a yzf450 carb being a better install. Might want to look into that.

[CJM]

I wouldnt want the yfz carb, they have an issue where you need to use zipties on the mech b/c it doesnt work right without them. They also have a hanging idle issue.

The 04-05 450r carb fits fine, you can massage the airboot to fit or buy/make an adapter, the gain is very nice and its rather easy install.

[Baileygunns]

I have an adapter and a stage 2 cam for sale if you're looking for either.. Adapter is new and cam is used.

[on the rocks]

i have the stage one in a 440. i think the torque curve comes to quick and lacks on top end. i would go stage 2. i also have the stock carb and it works fine, the 450 would be an up grade but a properly jetted stocker gets the job done.

[2001400exrida]

I wouldnt want the yfz carb, they have an issue where you need to use zipties on the mech b/c it doesnt work right without them. They also have a hanging idle issue.

The 04-05 450r carb fits fine, you can massage the airboot to fit or buy/make an adapter, the gain is very nice and its rather easy install.

have you ever owned a yfz. the yfz carb is far superior to the 04/05 trx450 crb. the yfz carb is an FCR carb. The issue that CJM is talking about with the ziptie is a very simple and easy fix, it works fine without them, to say it doesn't work right without the ziptie is a falsity. The ziptie just helps with throttle response. There is slight delay in the accelerator pump assembly and ziptying the pieces allows for faster response of the throttle. Man it helps to have actual real life information before throwing out wrong info marc, come on dude.

YFZ carbs do not have a hang idle issue, i'm not sure where that piece of information came from.

on a 440 build the 450r carb is just fine, in fact a 400ex carb if tuned properly can work just fine too. THe whole 450r carb being an upgrade is truly over rated.

[chronicsmoke]

I have a 04 400ex and just installed a 440 BB kit new jug and 11:1 wossner piston. I'm running a evo big gun full exhaust and am toying with the I idea of a 450r carb. I've read reviews on stage 1 and 2 hot cams and am still not sure. then I read an article about using an xr400 stock cam or even better an xr stage 1. I'm wanting to build a trail beast. any and all info would be greatly appreciated.

450r carb is easier to do; there is an adapter already designed for it and at least 100 or so guys on this forum are always available to talk.

The 39mm YFZ carb may have better throttle response but I doubt it would yeild anymore power than the 450r carb. Throttle response, yes, but overall power I dont think so. the harder hit of the FCR will tire you out faster, so if you want to ride longer and farther the 450r carb might be the better option. There are some XC guys on 06+ 450rs that revert back to the 04/05 butterfly style carbs for just that reason. But again you'd be absolutely fine with either, I find the 04/05 450r carb is just easier to tune.

I'd also go with a stage 2 cam, hands down. Stage 1 will have lots of power down low but the stage 2 will pull higher in the power band.


THe whole 450r carb being an upgrade is truly over rated.
I wouldn't say that.. Ron saw 2hp on a stock piston/stock stroke/stock bore quad, I'd bet that the gains are even higher once you start opening up the displacement as well..

http://www.atvriders.com/vbb/showthread.php?409169-Shoot-out-coming-soon!-450r-carb-vs-OEM-carb/page5 (post#44)

^^
Man it helps to have actual real life information before throwing out wrong info marc, come on dude.

lmfao

[Baileygunns]

You gotta figure tho Dave... This is the only forum he can troll CJM on, lol.

[2001400exrida]

i'm sorry, did i miss something? you need to go back to HQ if you want to start drama. I'm just giving my input, if ya don't like it i'm sorry, but don't start bad mouthing.

thank you.

[chronicsmoke]

This is the only forum he can troll CJM on, lol.

lol

[Pappy]

C'mon fellers....we don't need the stabs and jabs please:ermm:

[2001400exrida]

C'mon fellers....we don't need the stabs and jabs please:ermm:

Thanks pappy. It seems these guys have grown accustom to thinking its ok to talk people down. Glad to see that's not allowed here.

[chronicsmoke]

Thanks pappy. It seems these guys have grown accustom to thinking its ok to talk people down. Glad to see that's not allowed here.

:rolleyes: he was referring to your comment about CJM's mother that Pappy had to delete. You're not the victim.

That's all I'll say to you, cheers ryry. :muscle:

[JOHNDOE83]

I'm leaning towards a hc2 but would like to know all my options. and do I need an adaptor to install the 450r carb?


You dont need a speacial adapter for a 450r carb, you can use a 2in rubber grommet from lowes or home depot that only cost $4.

Some people choose the $45 adapter thats made here, I just dont like glueing it on the carb and sanding the carb down...not cool, just my opinion.

You need a hot cam stage 2, the stage 1 is for carbd piped or stock 400ex, the stage 2 is for big bore or mild modd 400s, the stage 3 is specifically for the stroker kit.

All that info is available through hotcams.

[chronicsmoke]

You dont need a speacial adapter for a 450r carb, you can use a 2in rubber grommet from lowes or home depot that only cost $4.


I took your advice and went to Home depot and came out with a ABS adapter..
http://imageshack.us/a/img850/2267/12h9.jpg

[JOHNDOE83]

on a 440 build the 450r carb is just fine, in fact a 400ex carb if tuned properly can work just fine too. THe whole 450r carb being an upgrade is truly over rated.

Well, yes and no.

The 450r carb Does have a higher peak HP rating then the fcr, the fcr provides a flat slide which gives better throttle response and a quick stab of power. The fcr is a smaller carb then the 450r carb, the 450r carb is 42mm and the fcr comes in 38, 39, 40mm.

Now, if you were to have th fcr bored to a 41 or 42mm then it would out perform the stock 450r carb.

If you want to just install and have the most hp, get the 450r carb, if you want to race mx, get the fcr but get the bigg one, If you want to be the baddest out there in your class HP wise, get a bored out fcr carb.

My reccomendation always goes for the 450r carb for bolt on "HP" performance, the FCR with its flat slide gives the impression of more HP but is actually more stab and throttle response. "great for MX"

[2001400exrida]

:rolleyes: he was referring to your comment about CJM's mother that Pappy had to delete. You're not the victim.

That's all I'll say to you, cheers ryry. :muscle:

thanks Dave Dave.

fyi, fellers is plural, we're all victims. Point being, you're shenanigans of pushing people around with your little posse won't work on this forum. take my opinions, if ya don't like them that's totally fine, what ever happened to discussing things without pouncing and name calling?

Good points John Doe. I currently run a stock yfz450 FCR carb on my 05 450r and while i did notice a little more punch it hasn't been an eye openeing upgrade. Next step will be to have this carb bored, that should help greatly.

Also when it comes to swapping carbs on the trx450r, you're better off finding the dirt bike FCR or the yamaha FCR because it doesn't require much modification. If you try to put the 06+ fcr 450 carb on a 04/05 it's a bit more difficult because it doesn't fit as well as the beforementioned FCR's.

I'm going to grab that adapter like you mentioned and see if i can put my old r carb in the 400ex. I had one in my 2007 and honestly didn't notice much of a difference, i think it might help though if i put it in my 426 11:1 build.

[CJM]

Apparently I missed you calling me names...again.

450r carb is the best upgrade for a 400 hands down, the rest of the 400 gang has already explained why as well.

[400man]

I got the yfz carb on mine. it took a little effort and custom work to make it fit like I wanted but im very happy with it. aint touched the jetting in a year or 2 since I put it on and it always starts fine and runs great. but yea, the zip tie trick is just a alternate fix for changing out a jet to fix the flat spot when you punch the throttle really quick. it just helps shoot more fuel in quicker. I wanted to have a quick reving bike (like a 450r :p ) so that's why I went with it over a 04-05 450r carb. but if you just wanted more peak HP then the 450r carb would be better.

http://i417.photobucket.com/albums/pp255/ky2stroker/400exfcrcarb004.jpg (http://s417.photobucket.com/user/ky2stroker/media/400exfcrcarb004.jpg.html)

http://i417.photobucket.com/albums/pp255/ky2stroker/400ex450r011.jpg (http://s417.photobucket.com/user/ky2stroker/media/400ex450r011.jpg.html)

http://i417.photobucket.com/albums/pp255/ky2stroker/400ex450r009.jpg (http://s417.photobucket.com/user/ky2stroker/media/400ex450r009.jpg.html)

[Bigpoppa]

Thanks fellas for the info. I went with the HC 2 and shortly after break in I blew out the head gasket. now what I'm highly discouraged with this big bore. any advice?

[JOHNDOE83]

I suspect that your jetting is way to lean and caused some heat that ate your gasket.

440 with a 450r carb needs BIGG main jets and big pilot jets.

My 440 motor "which I just sold" used a 220 main jet and a 50 pilot with a 450r carb, had a stage 2 cam and a white bros rev box and a white bros exhaust with kibble white valves.