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Discussion Starter · #1 ·
I got air filter pods and when I put them on I just left the vent hose for the crank case just kinda laying there. when i was running it last night i encountered an interesting problem. the idle was not very steady and when i investigated it i found this little rectangular hole in the back of the transmission that was venting air. when i plugged it off with my finger the idle started to smooth out a little bit. looking a little bit more i saw that when i left the vent hose off i just pushed it up in the frame and it was folded over and pinched off. i figure the pressure was unable to escape and started to fiddle with the idle. I pulled the crank case hose off for now and haven't had time to run it since. what do you guys with air pods do with that hose? i was going to get a crank case breather filter for it but I don't know if that will work for inspection. looking for some other ideas.
 

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I got air filter pods and when I put them on I just left the vent hose for the crank case just kinda laying there. when i was running it last night i encountered an interesting problem. the idle was not very steady and when i investigated it i found this little rectangular hole in the back of the transmission that was venting air. when i plugged it off with my finger the idle started to smooth out a little bit. looking a little bit more i saw that when i left the vent hose off i just pushed it up in the frame and it was folded over and pinched off. i figure the pressure was unable to escape and started to fiddle with the idle. I pulled the crank case hose off for now and haven't had time to run it since. what do you guys with air pods do with that hose? i was going to get a crank case breather filter for it but I don't know if that will work for inspection. looking for some other ideas.
I just went to autozone and got a breather filter for about 2 bucks.
 

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Discussion Starter · #3 ·
thats what i think i'll have to do. did you notice if the tail end of your trans has that little rectangle? at first i thought it was a piece that broke off but it looks like it was intentionally cast that way
 

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Kind of odd because the breather normally goes into the airbox thus has a small amount of vacuum on it, same thing as the PCV valve on a car.



You could probably route it through a small fuel filter and hide it as far as inspections go, but just how strict (or how well do they know) 30 year old bikes at the inspection stations? Luckily we dropped the whole inspection thing on all vehicles decades ago, it was more of a hassle to the state and a lot of dishonest inspection stations were getting rich selling people stuff they didn't need.



Most vehicles on the road are fairly new and 99% of the people that own them don't mess with them unless the check engine light comes on. Oddly though you can get pulled over for having a fairly loud car but they pay no attention to bikes with straight pipes that can drown out your stereo from a half block away.
 

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Discussion Starter · #6 ·
I'm going to try to register the bike as a vintage so i won't have to go thru emissions. there's a mileage restriction on that kind of registration but I don't have a odometer anymore so I think i can get around that. i just want something that will not allow anything in and let the air out
 

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I rerouted it into the pod filters. I'm not sure how it'll run yet. I imagine my filters will look grimy faster than other people's, but I think it would provide the vacuum as in the stock airbox setup.

Here's a pic showing the brass L-fitting going into the pod filters (i just made a hole in each pod), then connected to the white plastic T-fitting, which then connects to the crankcase breather tube.

 

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No doubt that's the proper way to do it, bit of a hassle but it will help keep some vacuum on the crankcase.



I will assume you rejetted the carbs to handle the pods?
 

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Discussion Starter · #10 ·
that is brilliant how you did that. i don't think i can even do that, the lip of my filters isn't deep enough to make this kind of modification. i bought a breather filter but haven't modified it to fit yet. i trimmed the stock hose down so it wouldnt kink and put it to exhaust out the side. i have to trim off the breathers stock rubber mount to fit it to the existing rubber mount. it was the least of my bike worries on sunday when i couldn't shift out of first and broke off my license plate mount but now i think i have the time to make it work.
 

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No doubt that's the proper way to do it, bit of a hassle but it will help keep some vacuum on the crankcase.



I will assume you rejetted the carbs to handle the pods?


Yup...rejetted to 90/120. I forget where I got this idea, but I remember it saying that I'll end up running a little richer with my breather tube routed into my pods because of the bit of oil that gets vented out. Well we'll see...
 

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that is brilliant how you did that. i don't think i can even do that, the lip of my filters isn't deep enough to make this kind of modification. i bought a breather filter but haven't modified it to fit yet. i trimmed the stock hose down so it wouldnt kink and put it to exhaust out the side. i have to trim off the breathers stock rubber mount to fit it to the existing rubber mount. it was the least of my bike worries on sunday when i couldn't shift out of first and broke off my license plate mount but now i think i have the time to make it work.


I actually had the setup in mind when I bought the pods and made sure I got the oval shaped cone with the offset inlet.
 

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Discussion Starter · #13 ·
I wasnt thinking of any kind of crank case breather when i bought my pods. i just bought the cheapest pods that would fit. i got a cheap breather but the inlet hose didn't fit the port. so a little bit ago i pulled the little fitting off the breather and attached it to the hose. looks okay but it works which is more important.
 

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I rerouted it into the pod filters. I'm not sure how it'll run yet. I imagine my filters will look grimy faster than other people's, but I think it would provide the vacuum as in the stock airbox setup.

Here's a pic showing the brass L-fitting going into the pod filters (i just made a hole in each pod), then connected to the white plastic T-fitting, which then connects to the crankcase breather tube.

You used a 90 elbow with threds on both sides. They do make that in a barbed fitting with only one side with threds. If the barbe is a bit long just cut it shorter. That way when the hose srinks it will not pull off the threded side.

Looks good otherwise. I enlarged the picture and could see the threds.

Just my thoughts.
 

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You used a 90 elbow with threds on both sides. They do make that in a barbed fitting with only one side with threds. If the barbe is a bit long just cut it shorter. That way when the hose srinks it will not pull off the threded side.

Looks good otherwise. I enlarged the picture and could see the threds.

Just my thoughts.
Absolutely right. i actually searched a bunch of hardware stores in my area and they all seemed to be out of stock on the threaded + barbed elbow fitting. I just have to find a plumbing shop instead i guess.
 

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Hard to find, but a good HVAC wholesale supplier that supplies for pneumatically controlled systems will have these parts often cheaper than Home Depot or Lowes.



I also know of an excellent mail order place in Colorado but I forget the name, it's up at work somewhere. They also have the fittings that go into the carb sync holes.
 
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