listen up- running the cc line to the airbox is a huge waste of time. read further into the historical threads regarding this and you'll see. don't listen to some guy who just got their first ds bike and thinks they are a pro mechanic on it. I've had two KLX 250s and have done all the basic mods to both. I heated up a drill bit and burnt my way through on the existing vent on both my bikes. The mod itself really doesn't do anything. I've said before that it may let the bike rev quicker but really, it's not anything you'll notice. If your filler cap is leaking, it's not because of the cc breather, it's because it's either not tight enough or is defective itself.
You'll need three plugs to remove the smog system, that's it. No clamps or bolts. Just remove the hoses and apply the right sized plugs to the holes left open. This mod will cool your exhaust gases but nothing else but clean up the hoses under the tank.
I've done the cc mod on both bikes, and have not had any oil in the airbox. If I had like he said, upwards of a quart leaked out, I think I would've taken my bike in as there is obviously something wrong there. I mean the bike only holds like almost 2 quarts. If one has leaked out, your engine is in danger. Another reason why it could leak is overfilling of oil. I've never had a leaky filler cap on my '06 or my '09. I measure precisely 1.9 liters of oil when filling it up.

 

Which is truly amazing since you've been overfilling your crankcase.

Engine Oil API SE, SF, SG (SH, SSSJ or SL w/JASO MA) 10W40
—w/Filter Change 1.4 L (1.5 qt.)
—No Filter Change 1.3 L (1.4 qt.)

 

So removing the smog stuff will net cooler exhaust temps? That'd be nice, the stock can is an Easy Bake Oven. There are still cooked remains of flesh and other materials scorched onto my can. If removing all that smog stuff really lowers EGTs then I'ma definately look in to that this weekend.

 

The smog system takes unburned hot exhaust and recycles them back into your carb, which why you have the hose on your carb. the recycle is to make sure that all unburned gasses are burnt before they go out the tailpipe and into the world. It is all about clean air and less pollution.

Here is the deal with horse power and the reason why cold air intakes work. Colder air better atomizes the air/fuel mixture which means you get better more thorough burn which is why you get more horse power. With colder more dense air you can add more fuel which is the real reason for more power. The ONLY way to make more power is add more fuel. Inorder to burn the fuel you need more air.

Hot air=
Cold air=

If you want to make the bike look real pretty after you pull it off Bill blue sells a alluminum plug for the fitting on the front of the bike for 5.00.

 

the best piece of information someone can give on these forums is never listen to IG. you know anyone who tries to sell a used machine for only $100 less than sticker isn't right in the head.
________
PORNSTARS PALIN

 

Be careful not to confuse Kawasaki's KCAS (air injection) system with an EGR (exhaust gas recirculation) system, the KCAS system injects fresh air into the exhaust stream during deceleration to more completely burn the gasses that leave the engine before they exit the tailpipe.
The hose on the carb tells the actuator to open during high vacuum (decelerating) conditions.


Roger that.

 

LISTEN UP!!

Ultra endearing way to begin a post. Especially when berating a group of, mostly, adults.

As far as the smog and crank breather mods, if YOU think they are a waste of time:

#1. Why did YOU do it ?

#2. Why did YOU do it a SECOND TIME??

(If somebody told you to jump off a bridge, would you do it??)....(not AGAIN)

#3. Why should you care. Has somebody somehow wasted YOUR time while doing THEIR mods??

Many people have suggested the mod. About as many people have said it's no HP maker but might help exhaust temp. That doesn't sound like a waste of time. It sounds like some modder trying to make his ride just a tiny bit better. Alot of tiny bits add up plus, I'm having FUN farting around with my KLX.

We're all here to BS, learn, provide advice or in one way or another be friendly and HELP OUT.

You sound like your berating a child. Nobody here is a child and it's not your job to "correct" people that feel like wasting their own phuquing time!

I was warned about you in my first post. I replied that I gave everybody the benefit of the doubt until they proved they didn't deserve it.

Congratulations....YOUR #1 !!!

Sorry for the newbi rant but JEEZ!!

 

Now that's funny.

 

I'm a little confused. If I remove our smog system will it help with deceleration bubbling and slight popping?

edit: Wait...I think I'm OK. If the purpose is to burn up gasses in the exhaust, that would introduce a lean condition, exacerbating the lean popping phenomenon. Getting rid of the smog system would allow more gas in the exhaust which would make a richer condition.

I've read that even if your air/fuel mixture is perfect, you can still get some popping on deceleration with a smog system. Which one KCAS or EGR I'm not sure.

 

Mine "popped" while backing down, especially downhill, WITH the reburner. It's torn up now so I don't know if the reburner mod helps or not. I guess I'll never know since I'm throwing a bunch of stuff into it while it's taken down.