Thoughts on vented dipstick
Seasoned HDF Member
Joined: Jan 2008
Posts: 13,652
Likes: 11,421
From: State of Confusion
my thoughts are, it's a relatively new thing being made and sold, and millions of Harleys got along just fine without them, and I bet far less that 1% of bikes have them since they have recently apparently became 'a thing' ..I personally don't buy into these and many other things I don't believe are necessary..some feel like they must do something and buy everything that comes along to try and help their poor fragile bikes from self destructing and it makes them feel better I guess
Thread Starter
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2nd Gear
Joined: Oct 2019
Posts: 6
Likes: 7
From: Ct
guess its on the m8s from not enough breathing on the larger 114 to 131 engines that push way more air around. plus the old bikes had crankcase breathers and i hear the EPA cracked down on harley to plug up the crankcase more, this is what ive read hence the sumping issues.
Stellar HDF Member
Joined: Sep 2006
Posts: 3,236
Likes: 95
From: lancaster, pa
I saw the video from A1 and figured I'd try it(100$x2). Got 2 , one for my 07. I know you asked for a mechanics opinion
. I feel like it helps. I know even with nice big vents all drilled out over size my 07 gets pressure on the stock oil cap when I pop it off you hear that hissss. this spring Im thinking of moving the hose around to the back ,probably installing a 90 degree joint... I think it makes the jugs hotter by blocking air flow a little.
I know this can be like an oil thread, but sense im not doing much to the 2020 except riding it ., I felt like finding some sort of way to get rid of all that cash I got laying around
. I feel like it helps. I know even with nice big vents all drilled out over size my 07 gets pressure on the stock oil cap when I pop it off you hear that hissss. this spring Im thinking of moving the hose around to the back ,probably installing a 90 degree joint... I think it makes the jugs hotter by blocking air flow a little.I know this can be like an oil thread, but sense im not doing much to the 2020 except riding it ., I felt like finding some sort of way to get rid of all that cash I got laying around
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Road Warrior
Joined: May 2011
Posts: 1,956
Likes: 439
From: florida
Harley vented the oil tank decades ago. Most all performance shops vent the tank on certain size and up motors. So if you don’t have a higher output bike probably don’t need it. Although the M8 is problematic with crankcase pressure in general.
