Breather Mod " Venting The 05's"

Sorry to hear of your oily bikes Eric and ranchero.

I know the breather mod is very popular with alot of people but I really don't see the neccessity unless you're a high revving racer or your bike is upside-down alot. I've had great success with my stock setup other than the hose deteriorating.

Just an un-asked for opinion.

Log

i agree with logjump, i also have no issues with the stock setup . 135 hours on the bike and replaced the unit once .

Just for the conversation, I also did the breather mod just over a week ago and had good results. I have the one way check valve 1" from the rocker cover connection with the valve being perpendicular to the ground and then the hose looped under the frame backbone and down to the swing arm. The hose end is positioned so that if anything comes out it is quickly tossed into the dirt just in front of the tire and chucked out the back from a spinning tire , like some James Bond oil slick gadjet. I spent two full days riding last week in the sand dunes of Glamis without any mess or any other related problems to the breather mod. Just my input for you others to think about.

Regards,

Perhaps having the valve in the up position acts somewhat as a oil mist separator whereas if it is fitted in a down draft position it only keeps the oil flowing one way and creates some vacumn.

Click to expand...

husabutt,
I would have to believe the quoted statement is probably the major factor in the puzzle. I was looking at the valve inners and I believe the diaphram assembly is probably what isolates the oil from proceeding down the hose to make the mess. This, I believe, functions somewhat like the piece of foam that is inserted into the stock breather neck and collects the majority of the oil mist knocking it back down into the engine to be recirculated again. Again, this is just my theory but it makes sense to me. Maybe another approach would be to place the foam insert from the stock breather just prior to the check valve for a condenser type of action? I thought about doing this but didn't.... but I may go back and do it if needed. Place a piece of safety wire through the hose to keep it in place and prevent it from accidently sliding down into the case... what do you think?

Regards,

I think the problem with how I had mine connected was just what you guys said, original to the frame is vertical with the separator, I had 90s at the engine connections going horizontal to the valve & then down. So oil splash couldn't drain back down to engine, drained out instead. It would probably be alright if I put the hose vertical & over the backbone but I'm going to leave it hooked to the frame for now.

If you this read Bobzilla can you comment on if the valve installation into the stock breather boot has reduced the oil mist into the frame backbone.[/quote]

Husabutt
I am not going to make a judgement at this time since I had a couple of strange things when I was on my maiden test . Doohhh, I was upside down and still running for about 1 minute. I think there is some leakage when running upside down for that period of time and the air box did have oil. There must have been enough oil for the weight of it to overcome the check valve. Enough that when I did shut it off and get it picked up it would not start until I had cranked it forever and then bumpstarted it down the hill. So much oil infact that I have drool on my silencer. I must say that the bike was almost straight up side down and I rolled down the hill quite a ways and that is what kept me from getting the bike upright sooner.
I have given thought to how to do this again and am now leaning toward the method that I used on my 501 except using two hoses. I installed a piece of lawn mower air filter foam in the hose to sop up the drool and then let it drain back into the breather. That seemed to work ok and didn't make much mess and had the airbox clean at all times.
When I am back and fully mobile again ( on April fools day I hope) I will try some more tests and see. I do think the idea of having some material to soak up and condense the oil mist is a good idea hence going back to the foam. I was just going for the stoppage of oil loss. My old way worked fine but lost some oil at times. I just gotta learn to keep it right side up or at least get up faster. :twisted: