Your engine isn't in very good shape if you are getting a lot of oil coming out of there, blow-by basically. Also leaving the tubing exposed to air isnt the best.

Quote from: slowinthestraights on September 11, 2007, 01:06:09 AM
Your engine isn't in very good shape if you are getting a lot of oil coming out of there, blow-by basically. Also leaving the tubing exposed to air isnt the best.

Did you send your breather hose back into the lunchbox on your GS?

Quote from: crispy5 on September 11, 2007, 07:22:58 AM

Quote from: slowinthestraights on September 11, 2007, 01:06:09 AM
Your engine isn't in very good shape if you are getting a lot of oil coming out of there, blow-by basically. Also leaving the tubing exposed to air isnt the best.

Did you send your breather hose back into the lunchbox on your GS?

No, that is the same as leaving it open to air, but its filtered air. Im routing it into the top vacuum line on the carb, above the fuel line.

Quote from: slowinthestraights on September 11, 2007, 10:09:06 AM

Quote from: crispy5 on September 11, 2007, 07:22:58 AM
Did you send your breather hose back into the lunchbox on your GS?

No, that is the same as leaving it open to air, but its filtered air. Im routing it into the top vacuum line on the carb, above the fuel line.

Actually, it's not quite the same, because the lunchbox/airbox is under a vacuum, so you have a kind of valveless PCV.  (The intake vacuum forcibly draws crankcase fumes out.)

You're routing it where?    OMG, if that's what I think you're saying, that's the carburetor overflow tube!!!  If your floats get stuck it will dump fuel into your crankcase...  NO NO NO 

Quote from: Chuck on September 11, 2007, 11:03:10 AM

Actually, it's not quite the same, because the lunchbox/airbox is under a vacuum, so you have a kind of valveless PCV.  (The intake vacuum forcibly draws crankcase fumes out.)

You're routing it where?    OMG, if that's what I think you're saying, that's the carburetor overflow tube!!!  If your floats get stuck it will dump fuel into your crankcase...  NO NO NO 

I havent done it yet, I wasn't sure what it was so I was goign to check what it was first, of course.

OK here is my Catch Can ( actually a catch bottle) for my GS500's rocker cover breather. This prevents oily mist from being blown all over the rear of your bike if you have fitted an after-market air filter.





So basically I:

1. got a small juice bottle.
2. Drilled a large hole in its lid that would snuggly fit the Valve Cover breather hose.
3. Drilled 12 small holes around the large hole in the lid (vent holes)
4. Fit the lid onto the valve cover breather hose.
5. Put a hose clamp on the breather hose under the lid to prevent the bottle from slipping off the hose
6. Filled a juice bottle with stainless steel scourers ($1's worth)
7. Screwed the bottle onto the lid ensuring the hose pushed into the middle of the scourers.




So now the oily blow-by gases from the valve cover flow into the bottle, condense on the scourer, drip to the bottom of the bottle, and the remaining pressure escapes out of the small vent holes in the lid.

After time the bottle will fill with an oily liquid (mixture of oil, water, fuel, acids). Just reach into the frame, unscrew the bottle from the lid and tip this oil into an old oil container and take it to your oil recycling centre.

Then just re-screw the bottle back onto the bike.

Every major service remove the entire catch bottle and clean it, the vent holes in the lid and the scourers out in kerosene.



Preventing this oily mist from being breathed into your engine helps keep its carburettor and internals cleaner, and allows the engine to run more efficiently (as it only breathes clean, fresh air).

It is also important for the engine to be able to relieve any pressure build up that occurs in the engine as freely as possible. Otherwise the pressure build up may cause a seal or gasket to blow. The inline fuel filter I previously used became 'glugged' up with oil and no longer breathed sufficiently. That's why I searched for, found and implemented this method. 

Just out of interest... what is everyone else that uses a Lunchbox or pod filters doing with their rocker cover breather?

Quote from: galahs on September 23, 2007, 05:36:24 AM
OK here is my Catch Can ( actually a catch bottle) for my GS500's rocker cover breather. This prevents oily mist from being blown all over the rear of your bike if you have fitted an after-market air filter.

Good idea, and good post! 

Yea you can do this, I have in the past used a PCV valve as well.
Cool.
Buddha.

Are there are non-ghetto looking ways to do this?  I want to install those mods but I dont wanna have some ghetto bottle on my bike to catch shaZam!...

Isn't there a someproduct that does that?

Couldn't I just build a one way valve that drains the engine-juice on the ground?

yes you can


make sure you dump that oil right in front of your rear tire

Here's an idea... why not buy a 90 degree vacuum line elbow, drill a small hole in the flat side (rubber top/back) of the lunch-box filter and run the hose to it?? It'll still re-burn the oil residue and look stock... ish.

Yep that is another option that would appear to most untrained on lookers as being stock,  but it will also result in your carbs being exposed to oil, making them dirtier and adding oil to your combustion (Yuck!).


The best option would be

1. to have a line into the catch bottle
2. the oil collects on the steel wool and settles in the bottom of the bottle
3. the cleaner air (fumes)  is piped back to  the air filter and then sucked in and burnt


A steel or aluminium container would help make it look stock. 

Quote from: galahs on February 17, 2009, 05:36:05 AM
Yep that is another option that would appear to most untrained on lookers as being stock,  but it will also result in your carbs being exposed to oil, making them dirtier and adding oil to your combustion (Yuck!).

Wait isn't this what happens with the stock airbox?  Where does it route to in the factory stock box?

Quote from: galahs on February 17, 2009, 05:36:05 AM
Yep that is another option that would appear to most untrained on lookers as being stock,  but it will also result in your carbs being exposed to oil, making them dirtier and adding oil to your combustion (Yuck!).

ya never heard of a 2 stroke??

A two stoke engine is designed to burn oil, 4 strokes prefer not to.

I heard you can just put a paper towel around the hose and keep it on there with a rubber band so nothing will get in, but it will allow air out.

Quote from: tripleb on March 03, 2009, 07:42:50 AM
I heard you can just put a paper towel around the hose and keep it on there with a rubber band so nothing will get in, but it will allow air out.

That's only going to work until the bike gets wet though, then the paper towel will just disintegrate... It would be extra bad if some of that paper towel made its way back down the hose...

Quote from: fred on March 03, 2009, 02:24:32 PM

Quote from: tripleb on March 03, 2009, 07:42:50 AM
I heard you can just put a paper towel around the hose and keep it on there with a rubber band so nothing will get in, but it will allow air out.

That's only going to work until the bike gets wet though, then the paper towel will just disintegrate... It would be extra bad if some of that paper towel made its way back down the hose...

It wouldnt get past the wire mesh filter inside the cam-cover where the breather hose exits.

Quote from: sledge on March 03, 2009, 03:01:56 PM

Quote from: fred on March 03, 2009, 02:24:32 PM

Quote from: tripleb on March 03, 2009, 07:42:50 AM
I heard you can just put a paper towel around the hose and keep it on there with a rubber band so nothing will get in, but it will allow air out.

That's only going to work until the bike gets wet though, then the paper towel will just disintegrate... It would be extra bad if some of that paper towel made its way back down the hose...

It wouldnt get past the wire mesh filter inside the cam-cover where the breather hose exits.

Good to know. Still doesn't seem like the greatest of ideas though...