[sixmohabit]

I have an 07 450x. I have jetted, accelerator pumped, air screwed, modded the air box, breather by-passed, smog block offed and changed the filter. All that's left is the backfire screen, pink wire and "o-ring" mod (which is new to me tonight - 12-30-07).

Help...is the pink wire the same on the 07 as previous models?
What the heck is the o-ring mod?

I have a couple of Uni filters, if I remove the backfire screen am I going up in flames? or is it entirely necessary to replace them?

[CRF916]

1. yes


2. heres a picture and a link to more info..

http://crfsonly.com/howto/ap-mod/profes ... -guide.php

[DiagTech]

I have an 07 450x. I have jetted, accelerator pumped, air screwed, modded the air box, breather by-passed, smog block offed and changed the filter. All that's left is the backfire screen, pink wire and "o-ring" mod (which is new to me tonight - 12-30-07).

Help...is the pink wire the same on the 07 as previous models?
What the heck is the o-ring mod?

I have a couple of Uni filters, if I remove the backfire screen am I going up in flames? or is it entirely necessary to replace them?

Your '07 doesn't need the o-ring mod. It has already been taken care of with internal carb changes for this year.

I don't know about those air filters. I have heard a few here have run the stock air filter without the backfire screen without concern. There is always the possibilty of fire without the screen, but there are also backfire resistant filters available.

[CRF916]

Ahh.. Good catch DTech, I didnt know that.

[JAWS]

I have a couple of Uni filters, if I remove the backfire screen am I going up in flames? or is it entirely necessary to replace them?

In truth, your chances of going up in flames are remote, but.... since it is a possibility, why not take some steps to help? Use the No Toil brand of filter oil. It is bio-degradable, can be washed in the kitchen sink without odor, and it is non-flammable. I ran my standard Twin Air filter for almost a year with just the No Toil and didn't have any issues. I wasn't inclined to throw away a perfectly good filter. I replaced it with the one with the flame retardant layer when the standard one tore.
BTW, the Twin Air has a lower profile than the UNI (a copy of the stocker) so it is a little easier to get in and out.

JOe

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Your '07 doesn't need the o-ring mod

.
DING DING DING !
It sure doesn't.
I wouldn't sweat the air filter screen for a minute personally,especially if you use No Toil or it's Honda labeled counterpart.
I do like the extral layered TwinAirs, since I use TwinAir old fashioned filter oil.
What is your jetting,anyway ? Doug

[sixmohabit]

Thanks to all for the guidance....as usual

Diagtech - Thanks for the good news, I checked out the o-ring mod from the link that Jaws provided and I can't tell you how happy I am that I don't need to do that!
Dobent - I'm running the following Jetting:
Main - 165
Leak - 65
Slow - 48
Needle - R needle at the 5th position
I honestly wish I would have just bought the JD Jetting kit so I would have a few more options but I got these jetting specs from a trusted Honda mechanic that rides and races a 450x...Seems to be working well...I also added a quickshot.
Jaws - I'm running Uni Filters & Uni filter oil, Can I simply clean these well and switch to the NoToil? or should I just make the switch to Twin air? Honestly, I'd throw out a couple of filters versus taking a chance on burning up my pride & joy!

[[email protected]]

R needle at the 5th position

We're glad to help.
I'd pull my plug and take a look at it.If it's all black and sooty, which I think it might be, raise it a clip, as in upward toward the top. 5th position is likely pretty darn rich with most any year OEM R needle.
If the plug is tan though, keep it the way it is.
You may also want to run the bike at say a third throttle and less for ten minutes or so and check the plug, because that 48 may well be pretty rich with that needle.
First though I'd get a look at the plug and adjust the needle clip if necessary,after riding as you normally would.
All those filters and filter oils are good products.I like how incredibly gooey the TwinAir oil is before it sets, plus since I use the TwinAir tubs it is very, very convenient.
As far as if that gooey factor being any proof that it works in a superior manner to it's competitors, I haven't a clue. Doug

[5 speed]

I rode my new to me 07 X yesterday with some fast enduro guys who kicked my tail. One was on a 525SX and the other on a 450R. Wide open many times in the sand which was soft due to lack of rain here in central florida. Bike is stock. No decel popping. I did pull out the exhaust insert and left the screen portion. It seems to run clean but its a tad on the slow side. If I tried to lug it in 3rd because I slowed too much for a corner it would pull but it does need more power.

I read a dirtrider article that said NOT to do all these things, especially the pink wire mod.

I guess my question is, what is your recommendation on what actually works and is necessary to improve the power. Realize I am riding in sometimes 6 inches of sand so it saps power out of the biggest bikes. This thing needs some help but I dont want to spend a ton of money and dont want to start modifying the motor at this point (cams and such) as its basically new.

[[email protected]]

Here's the scoop 5 speed :
Dirt Rider has an editor who personalizes what he thinks is "good for the sport", and his desire to be in control has his magazine publishing a lot of recommendations that simply aren't true.
The 450X is one of his main whipping boys. He rails ad nauseum about it's "spot-on" jetting, and has even referred to riders running 94db or less pipes as irresponsible. He did the same thing with the KLX450, which proceeded to go through two pistons and a warped cyclinder head in 50 some hours...absurd.
Here's what works...a JD Jetting kit with the recommended(and required) air box mod, and a good aftermarket pipe along with that works wonders.
http://www.crfsonly.com/catalog/product ... ts_id/1093
If you spend a lot of time WFO with those guys you're riding with then absolutely do the pink wire mod. The stock jetting/airbox/exhaust strangles the bike so bad that it won't pull to the rev limiter anyway and that's why , duh, it doesn't help with stock jetting. With what we reccomend you'll have a whole new bike with no loss of it's civility.
Do away with the smog thing,
http://www.crfsonly.com/catalog/product ... ts_id/1044
either with one of the excellent Applied kits or look up the outstanding sticky on "JBWeld" modification.
http://www.crfsonly.com/forum/viewtopic.php?t=13482url
Skoot22 who came up with the JBWeld smog fix also recommends using an NCVS needle, a 42-45 pilot and a 165-170 main jet in lieu of the JD kit, check out the 450X jetting data base and you'll see a lot of folks happy with either set-up.
Also add the super CrfsOnly/Kouba fuel screw.
http://www.crfsonly.com/catalog/product ... ts_id/1333
All these things are available right here and once you do them all....which sure doesn't take long....you'll be doing hand stands. The KTM's will have a red front fender all up in their, uh, tail pipe.
These things make your bike run a lot more like what it really is, a CRF450R with an e-start and a wide ratio gearbox.They are not expensive nor time consuming, especially when you look at how much less the X can be bought for vs. the KTM's.
If you really want t make it rip add a 450Ror HotCam Stage 2 cam, then go pumpkin hunting ! Doug

[5 speed]

Wow, great feedback. Thanks much, I need to get to work, and yes, never hit the rev limiter so I guess it needs some work

[5 speed]

I have ordered the JD jet kit, the fuel screw and the emissions block off along with a new filter. I am also going to modify the airbox. For right now, I saw a full Jardine exhaust which I suspect is an inferior product. However what did pique my interest was a replacement billet end cap for the stock muffler that has a spark arrester/screen built in. It appears this would be a flow improvement over the stock set up and I really question if buying an aftermarket silencer really gains you anything besides a weight savings. We shall see but I am excited to get this slug moving.....

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A good aftermarket system can get you a substantial boost in power. There's a ton of really good ones, though that Jardine they're trying to give away really isn't a top shelf unit.
A really popular and outstanding modification is to find either a great deal on E-Bay or a good deal on a new one 2005 CRF450R pipe and header. The guys have done that and added a ProMotoBillet spark arrestor cap to that and they get a big weight savings and a top to bottom power boost :
http://www.crfsonly.com/forum/viewtopic.php?t=14965
For the airbox you can just open the sides like the JD kit describes and the CRF's Only "How-To" shows, or you can do as the Honda 'Power-Up" directions recommend...just cut along the molded in lines Honda provided for that very modification on the airbox.
Some guys have done that leaving the airbox in, I had to remove it to get it done, and it wasn't a real tough job to do. Doug

[5 speed]

Thanks guys for all the info. Opened the airbox, installed the red needle on 4th position, installed a 165 main (I am close to sea level so I figured it should be good and have seen on research here about 50/50 with 165-170. I forgot I had the fuel adjustment screw, so I will loosen the carb again and install.

The one thing I havent resolved is the exhaust. I see low priced ones out there. I am leaning toward, for time being and instead of buying a cheap pipe, installing a different end cap that is offered on ebay for 43.00. It is a billet one and has a larger opening in the end but does have a spark arrester screen. Yes, its still heavy but it is an empty can so I would think it would work pretty good as compared to say a stock 450R pipe. What do you guys think?

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A stock 450R pipe and header will provide a substantial boost , especially in the mid to top end range, and wil save a good chunk of weight as well.
It needs to be for an 05 unless you don't mind some welding to relocate the middle mount.
Some of the guys have an R pipe with the beautifully made ProMoto Billet end cap, and it's a great combination in both appearance and function. Doug