Breather bypass
Finally did my breather bypass (pics included) - Harley Davidson Forums (hdforums.com)
And the post I just made to that thread addressing your exact question:
I haven't been through the 68 pages of this thread to see all the variations, but if you're running the OEM air cleaner in a late model touring bike air cleaner housing, you can pull the breather tube connection out of the tube in the back of the air cleaner, attach a rubber hose to it, drill a hole in the back of the cleaner housing, and run the hose out and down.
To clarify, each breather bolt has a tube connected to it. The tubes are joined together by a T-fitting, with the third prong of the fitting going into a crooked little tube that goes into a hole in the air cleaner itself (to route the goo to the intake). You pull the third prong of the fitting out of the crooked little tube and attach that to your new hose to be routed out and down. You'll want to remove the crooked little tube from the air filter since it will now allow unfiltered air to enter, and plug the hole (or just plug the tube itself). This costs no more than the cost of the hose, plus an old screw or plug of some kind (make sure it's something that won't get sucked in!).
Writing this at work, so no pics handy, but I can take some if it's not clear.
Links below for the hose I used (just for example - you don't need that much), and some silicone plugs (again, you don't need this many, and you could just put a screw in the hole for free, probably).
Last edited by Belloc42; Jan 12, 2023 at 09:44 AM.
Hopefully someone with more knowledge will chime in.
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When I ran the stock housing I purchased a couple feet of hose, union and hole plug. ran it out a drilled hole in the bottom of the housing.
These days I run the Trask setup
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smaller line is oil pressure they meet up and head our together
The larger line turns under the can cover, runs along the frame, then into a 90 just behind the cross member
Last edited by dfixit1; Jan 13, 2023 at 02:02 AM. Reason: extra thought for reply to quote
smaller line is oil pressure they meet up and head our together
The larger line turns under the can cover, runs along the frame, then into a 90 just behind the cross member
That big-ole air cover hides a bunch.










