Vented Dipstick
HDF Community Team
Joined: Jan 2020
Posts: 1,434
Likes: 800
From: Colorado
Kind of funny that this comes up, since my breathers used to push a lot of oil into the filter area/TB, but once I installed a catch can, very little oil in it isntead.
So it not that the pressure is building up so much in the motor that is pushing a ton of oil out of the breathers in the first place, but the vacuum in the filter system that is pulling all the oil out of the heads of the breathers instead.
So with vented dipstick and lets say factory breathers still in play that the TB will created the vacuum inside the filter, then even more oil is going to be sucked into the TB instead.
As for if the motor really is pushing that much pressure out of of the bottom end, then its time for a top end, since there is problem with that much blow by making it to the motor bottom to begin with by the rings.
So it not that the pressure is building up so much in the motor that is pushing a ton of oil out of the breathers in the first place, but the vacuum in the filter system that is pulling all the oil out of the heads of the breathers instead.
So with vented dipstick and lets say factory breathers still in play that the TB will created the vacuum inside the filter, then even more oil is going to be sucked into the TB instead.
As for if the motor really is pushing that much pressure out of of the bottom end, then its time for a top end, since there is problem with that much blow by making it to the motor bottom to begin with by the rings.
Cruiser
Joined: Jul 2015
Posts: 204
Likes: 41
From: Georgia
I'll take photos of them installed on the bike tomorrow. Plug goes into the threaded hole in dipstick cap. Socket barbs with hose clamp into hose.
Road Warrior
Joined: Aug 2009
Posts: 1,316
Likes: 578
From: Ft Smith Arkansas
Old thread
Kind of funny that this comes up, since my breathers used to push a lot of oil into the filter area/TB, but once I installed a catch can, very little oil in it isntead.
So it not that the pressure is building up so much in the motor that is pushing a ton of oil out of the breathers in the first place, but the vacuum in the filter system that is pulling all the oil out of the heads of the breathers instead.
So with vented dipstick and lets say factory breathers still in play that the TB will created the vacuum inside the filter, then even more oil is going to be sucked into the TB instead.
As for if the motor really is pushing that much pressure out of of the bottom end, then its time for a top end, since there is problem with that much blow by making it to the motor bottom to begin with by the rings.
So it not that the pressure is building up so much in the motor that is pushing a ton of oil out of the breathers in the first place, but the vacuum in the filter system that is pulling all the oil out of the heads of the breathers instead.
So with vented dipstick and lets say factory breathers still in play that the TB will created the vacuum inside the filter, then even more oil is going to be sucked into the TB instead.
As for if the motor really is pushing that much pressure out of of the bottom end, then its time for a top end, since there is problem with that much blow by making it to the motor bottom to begin with by the rings.
Stellar HDF Member
Joined: Aug 2011
Posts: 2,733
Likes: 1,784
From: Newnan, GA
I’m wondering about vented dipsticks as well. Right now, I have hose on my breather bolts that runs down to the frame and vents to the air without any filter. A little oil does drip out of it but not enough to leave any on my shop floor. I figure it’s better to run it down hill so any oil that gets past the umbrella valves will run out of the hose and not be an obstruction.
With a vented dipstick, I would think the oil in the line will run back down into the oil tank. So I’m wondering how much, if any, oil actually gets into and dips out of the filter on the end of the hose. It would be nice to hear from those that are using one.
With a vented dipstick, I would think the oil in the line will run back down into the oil tank. So I’m wondering how much, if any, oil actually gets into and dips out of the filter on the end of the hose. It would be nice to hear from those that are using one.
See @DK Custom for breather options.
Dang it! Got dinged by the "Old Thread" thing again.
Last edited by Mongo1958; Jun 20, 2025 at 02:57 PM.
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