How-To: Crank Case Breather Mod (with pics)

[Buell_Cru]

I don't want any oily residue getting anywhere near my back tire and I don't want any drip marks in the garage. My bike is my mark and it's with me wherever I go.

 

[chris_xb12s]

Dont know if you can see in this picture but i run a similar set up. Providing you drain the oil often enough there seems to be no problems. I usually check it every 250 miles.

 

[porkey1200]

I am haveing a idle prob and am gonna try it . thanks for the info and pics .

 

[Stevenc150]

Porkey,

The '07 - earlier XB9's & 12's had an idler screw adjuster. What year is yours and what RPM's is it idling at?

 

[SeabeeBueller]

I just did this mod to my 05XB12r and it is well worth the time and money. $27 at Autozone and 45 min while bbq'ing some chicken and havin a beer or 2.

 

[Trill]

[up]

Awesome write-up

My setup is quite similar

 

[Somthngfrce]

Awesome Write up for sure...After reading this mod for about 6 onths, I finally took the plunge. Took me about an hour and HOLY SH*T what a difference! The one thing I hated about my bike (the hiccup in 1st) is absolutely GONE! and the motor feels so much better to drive.. Thanks to all..... If I could buy a beer to you all for the posts, I would!!!

 

[Somthngfrce]

And thanks to URBAN ASSAULT for this exellent write up too! I'm not the brightest of the bunch and I usually learn Visually! I def. would have not done this if it wasn't for your pictures!!!

 

[dodge]

Made a quick video of the draft tube location with the motor thumping..

http://www.youtube.com/watch?v=zK7ZNstTnys

 

[Urban_Assault]

No worries, glad you guys found it useful.

-Tim

 

[HOVERJOCKI]

Hi.
Great info and help. Just did the mod this evening. I'm not technically savy when it comes to this stuff, but i got it done.
Took it for a ride and feels better.
One question though, i was sitting at some lights for 5 mins and when i looked down at the filter it had smoke/steam/what ever coming out of it.
Is this normal if it just idles... i'm gessing the gasses that once went back to the engine.
Any confirmation would be great and again, thanks for the help.

 

[Urban_Assault]

Mine does that too at idle, especially when it's cold out. (Just got the bike in October, so it's brand new)

It shows up more when it's cold, because the moisture that builds up in your crankcase is evaporating out. (Just like seeing the moisture in your own breath when it gets cold, or steam off a cup of coffee.)

Some of it is also oil that has reached thermal viscousity point, but again... it's pretty normal.

If it starts pouring tons of smoke out, then there's likely a problem. But if it's just a little, no worries... Mostly just steam and evaporated oil.

You can actually hold your hand over the smoke for a few seconds, and it will get wet from all of the steam. A little slimy from the small amount of oil, but mostly just wet.

If it becomes too much oil, it will have the typical "oil burning" smell that old smokey cars have.

-Tim

 

[HOVERJOCKI]

Just curious about the length of the tubing and the change in elevation the oil has to travel.
What i mean is the tubing comes down first, bends and has a slight up hill climb before the big bend down.
I have opened the screw and nothing has come out and i have driven it over 100 miles, or isn't that enough.
Again, just curious.
Justin

 

[Urban_Assault]

I actually haven't had much in mine either. A few drips of water, but otherwise nothing. I've heard mixed results from everyone else. Some have to drain it every gas stop, others don't.

I'm guessing mine isn't as bad because it's a brand-new motor. If the rings are settled correctly and not worn out, there won't be much blow-by past the pistons and less burnt oil to vent out.

That's just my theory, anyone else have input?

Justin, how many miles are on your engine?

Also, on mine I don't have an "up". It goes straight back across where the filter is, then down. I avoided having an "up" because of the very reason you just pointed out.

The filter "T" is also angled slightly upward, to make sure no oil drips down through it.

-Tim

 

[HOVERJOCKI]

Hey Urban.
Firstly i have a 2005 XB12S 13000 miles.
With the filter on the T joint i did the same thing and angled it slightly up incase of oil running in to it.
Here's a couple of pics how i routed it, basically like this mod. (Need to get some black ties)
Justin

 

[bottlefed]

Not to thread jack but what pipe it that on the re lightning in "chris_xb12s" post?

Aaron

 

[Thaloc]

Im confused as to why everyone replaced the initial breather hoses instead of just connecting them to the T connector and then running them back. Seems to save hose, and cut out a step to me.

 

[Thaloc]

So yeah, that was totally easy. I completely blame you guys for confusing me up.

I left the initial breather hoses in place, just cut off about 2" off the one with the nylon wrap. Connected them to the T connector and ran a hose from there back between where the subframe connects to the frame. I placed my filter right by my left heel guard and the drain hose runs behind the the left peg mount totally hidden until I move it out to drain it. I got a blue filter so it matches my color scheme.

But ya, you guys and all ur numbers and measurments and shit confused the **** outta me. All anyone needs to know is get shit in 3/8". Period. Im going to write up a dummy version for us "Mechanically Challenged" folks.

 

[Stevenc150]

Im confused as to why everyone replaced the initial breather hoses instead of just connecting them to the T connector and then running them back. Seems to save hose, and cut out a step to me.

Yeah, under the airbox, I used the stock hoses into a T and ran back except added one of the cool little air filters halfway down the "drain" line.

 

[Thaloc]

Heres a cell pic of my setup.