Breather bypass - Road Glide Forums
Do-IT-Yourself For all those Do-it-yourself ideas that will save you some bucks

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post #1 of 40 (permalink) Old 08-10-2017, 01:38 PM Thread Starter
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Breather bypass

Yes itís been written up before but my brother came up with a great idea while I was doing it. I over filled my bike. Itís a 17 ultra. Water cooled. Not air. So I got the wrong amount of oil from my local shop. Bike proceeded to shit all over the right side. Saddle bag. Head pipe. Muffler. So thatís what led me to do this.

Drilled through trailng edge of Screamin eagle sneaky peet. Through the last pleat. No permannent damage. And I can reach the line to pull it off air filter for service.


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post #2 of 40 (permalink) Old 08-10-2017, 01:43 PM
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No way would I run that on the inside of the filter.

If any of it comes loose, where do you think it'll end up.
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post #3 of 40 (permalink) Old 08-10-2017, 05:50 PM
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No way would I run that on the inside of the filter.

If any of it comes loose, where do you think it'll end up.
In the shop. Can I have my prize now!
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post #4 of 40 (permalink) Old 08-10-2017, 08:51 PM
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No way would I run that on the inside of the filter.

If any of it comes loose, where do you think it'll end up.
The same place it goes without the bypass installed...

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post #5 of 40 (permalink) Old 08-11-2017, 12:06 PM
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In the shop. Can I have my prize now!
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The same place it goes without the bypass installed...


If it comes loose, it gets sucked into the intake. At best, you get to play go fish. At worst it jams a valve open and introduces to the other valve, followed by the piston face.


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post #6 of 40 (permalink) Old 08-11-2017, 12:17 PM
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The same place it goes without the bypass installed...
He's talking about the parts, not the oil.

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post #7 of 40 (permalink) Old 08-11-2017, 01:00 PM
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Possibilities vs. Probabilities: could it go horribly wrong? sure ... It's possible. Anything can... But is it the most probable outcome? I think not.

Anybody remember how much fun it used to (not) be to safety wire the 3 air cleaner bolts? The factory didn't do it ...but one of those could easily come loose and get sucked in the engine... The stock Ham Can on my old 82 was safety wired.

Hay everybody wants the drippy breather line routed clean, out of the way, and somewhere it isn't going to dump all over the engine. Yet god forbid one tries to go up and over for fear that it may suck backwash/moisture into the engine. So this guy comes up with an alternative that's actually kind of clever, I think.

Could the plastic Y fitting age crack and shatter, sure...in like 20 years. But I think/hope that someone would think to service the air filter before then.

So maybe we just appreciate the guy sharing his idea and lighten up a little..
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post #8 of 40 (permalink) Old 08-11-2017, 01:20 PM
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Possibilities vs. Probabilities: could it go horribly wrong? sure ... It's possible. Anything can... But is it the most probable outcome? I think not.

Anybody remember how much fun it used to (not) be to safety wire the 3 air cleaner bolts? The factory didn't do it ...but one of those could easily come loose and get sucked in the engine... The stock Ham Can on my old 82 was safety wired.

Hay everybody wants the drippy breather line routed clean, out of the way, and somewhere it isn't going to dump all over the engine. Yet god forbid one tries to go up and over for fear that it may suck backwash/moisture into the engine. So this guy comes up with an alternative that's actually kind of clever, I think.

Could the plastic Y fitting age crack and shatter, sure...in like 20 years. But I think/hope that someone would think to service the air filter before then.

So maybe we just appreciate the guy sharing his idea and lighten up a little..
Its an issue of the severity of the problem being fixed, compared to the risk of a much more severe problem being introduced.

Hope is not a service strategy. As a rule of thumb, anything that can get sucked into the throttle body gets double retention. The backing plate bolts have mechanical locks as well as chemical locks. That hose has slip over barbs. Down the road when that fuel hose has softened up and the barbs have been lubed by oil vapor, how tight will the connection be? Tight enough to resist the turbulence and air flow. Probably it will be fine. But if it goes the other way, a nuisance oil carry over problem just became a big issue. The amount of effort needed to do it properly wont seem like much while you wait on the roll back truck.
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post #9 of 40 (permalink) Old 08-11-2017, 03:37 PM
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Down the road when that fuel hose has softened up and the barbs have been lubed by oil vapor, how tight will the connection be?
Okay, now try it from the other direction ... How tight does it really need to be? It doesn't have any high internal pressure trying to separate it, but it does have a fair amount of static external pressure holding it together simply by virtue of it being stuffed into the air filter.

As long as they use the right size line for the fitting, I don't see it ever going anywhere. And there are existing low pressure applications that use that type of fitting without any clamps or issues. Like vacuum lines and windshield washer lines which both use a lot flimsier tubing than the reinforced line he's got in the pictures above.

Now given how thin the overall air filter is. If you want to worry about performance issues caused by that amount of tubing potentially blocking the airflow ... That I won't argue..

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post #10 of 40 (permalink) Old 08-11-2017, 08:02 PM
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He's talking about the parts, not the oil.
Thanks!! Yeah I read that and kicked myself in the shin!!...lol...
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