Rear Head Check Valve-Gas Man

PROFLYER

SWOLE
Gas,

Please elaborate on what you were saying about plugging the rear head and moving the valve to the "bottom." I changed intakes again and am back to "what the hell do I do with this damn valve/line combo" now that it's not plugged into the stock intake. Pics as well please, I failed imagination in school :cheers: :cheers: Thanks buddy.
 

Gas Man

Cool isn't cheap
Calendar Participant
Ok... all your stock dogs run the rear breather to the air cleaner backing plate. The front one goes to the intake. The rear is the larger of the 2 breather lines. This is done because Uncle Sam's green house pussys don't think its a good idea to have a bizzilion bikes running around spitting oil on the pavement. Problem is, that when you're gettin on it, it will sometimes spit into the air cleaner a bit much. Have you ever saw oil spit on your right side battery cover sides? Or oil drip from your air cleaner? This is why.

You can remove it from the backing plate and plug that hole. Now its hanging out in no where land. This is a great time to run SS on this hose.

Now what you have to do is pay attention to the check valve. Its right above the carb now. You'll see the 2 clamps on it. This thing allows the top end to exhaul but not inhale. Check valve. It needs to remain with the white side of the vlv towards the motor. THIS IS IMPORTANT!



Simply get the SS line and hook it up on the nipple



Run it to the floor.


I have sense this ran it down the front near the oil filter hook up cause I didn't like it crossing over.


Shorten it just a bit shy of the floor but long enough so you can't see it. Re-install the chk vlv with the white side of it facing the motor (or up basically). Then re-use the black piece from the original setup that was ran from the head to vlv. (all you have to do it reverse the valve to make it right). Clamp the white side of the vlv to the SS line you just ran.

Zip tie it into place and you're done.

Is that enough? Do you need any more pics or info?
 

PROFLYER

SWOLE
Oh, I got that way thanks Gas. My question is I guess how was it that my rear head was plugged up top and instead i have a breather and a filter on the lower crank case between the engine/tranny? I was told a while ago you could plug the rear head as long as you run this bottom breather...does anyone know that for sure? I'd rather not run another line all that way since I already have that bottom breather installed...
 

Rick

Active Member
You got any pics of the lower crankcase breather thats installed? So are you saying you have had the top rear plugged for a while since you installed the lower breather? Any problems? I would go that route myself if it works. I would like to eliminate that top hose. Do you still have the front head breather hose?
 

Gas Man

Cool isn't cheap
Calendar Participant
That may be true Pro. I know that is how alot of the older bikes were ran.
 

Gas Man

Cool isn't cheap
Calendar Participant
I remember something about it... I remember that it had to do with capping the front tube as suggest by Alhall and that not working... don't remember if it was you or Fat Cat at the time on the old site. Either way if its anything I don't know I usually always refer them to you or alhall or somebody of longer expierence. I only know what I have expierenced and/or heard.
 

PROFLYER

SWOLE
OK, so I can vent the crankcase at the bottom and cap the rear head? Did I read that right? Another guy told me to cap the front hose on the intake and run the rear hose straight across to the front head, since it sucks and the rear blows....any thoughts on that guys?
 

PROFLYER

SWOLE
I'm thinkin no too...this guy I know who builds customs does that on all his bikes that have this breather setup and he says he hasn't had any problems...who knows, I'm just gonna try puking it to the ground like everyone else...
 

Chopper Dave

SIICK!!!
I'm thinkin no too...this guy I know who builds customs does that on all his bikes that have this breather setup and he says he hasn't had any problems...who knows, I'm just gonna try puking it to the ground like everyone else...
get some pic's Pro when you get it all done....
 

barhopper

Another round please
Cutter, what am I doing wrong for me to post? I wish my cases were polished. I didn't realize it till after I bought it. You guys with the full polished motor, I envy you. Or maybe its just more to polish. LOL
 

Fibersnake

Banjo Playing PsychoBilly
proflyer wrote "run the rear hose straight across to the front head, since it sucks and the rear blows....any thoughts on that guys"

Pro as Sul indicated, I also would think that would be a very bad idea. The rear is designed to vent excess pressure where the front is maintaining a vacuum. If you were to run the hsoe straight from rear to front, the lower pressure on the front would possibly create a situation where the check valve on the rear is lifted and end up creating a pump situation and pulling not only excess oil from rear but possibly normal oil.

Not sure how it would effect actuall operation since the oil in theory would go back to engine, but at the same time doing so leaves no where for the excess pressure to vent which could lead to their own set of problems.

Sul give an excellent break down as others have also. Best is to make sure that the rear is allowing the excess to vent, either to be taken in on the intake or to the atmosphere using the check valve. Use the front is optional, though personnaly I keep mine hook up to allow for slight vaccum in the crankcase.
 
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