External vent setup
Grand HDF Member
Joined: Dec 2008
Posts: 3,721
Likes: 372
From: Tonopah Az
In a perfect world the butterflies keep there from being any sucking on the hose...but the butterfly valves are not 100% effecient. There is a small amount of air that does suck back into the engine via the breather system...more at start up and shut down, than while running.
Running a filter at the end of the hose not only guards against the very small chance of anything getting back up into the engine, but the bigger benefit is that it will absorb the oil and other gunk, not leaving drips in the driveway or garage, and not spraying the underside of the bike with oil mist to attract a layer of dirt.
If you are running a filter at the end of the hose and getting oil dripping out of it, it is either-
A cheap filter (or more than 5000 miles since the filter was cleaned)
Too much oil or crankcase pressure
Too low of a viscosity of oil for the temps being ridden in
Worn or defective butterfly valves
Check out a complete selection of External Breather Kits HERE
Running a filter at the end of the hose not only guards against the very small chance of anything getting back up into the engine, but the bigger benefit is that it will absorb the oil and other gunk, not leaving drips in the driveway or garage, and not spraying the underside of the bike with oil mist to attract a layer of dirt.
If you are running a filter at the end of the hose and getting oil dripping out of it, it is either-
A cheap filter (or more than 5000 miles since the filter was cleaned)
Too much oil or crankcase pressure
Too low of a viscosity of oil for the temps being ridden in
Worn or defective butterfly valves
Check out a complete selection of External Breather Kits HERE
Seasoned HDF Member
Joined: Apr 2015
Posts: 10,000
Likes: 5,266
Originally Posted by santajim
Do the breather bolts you sell fit under a 14 limited air cleaner cover?
Grand HDF Member
Joined: Dec 2008
Posts: 3,721
Likes: 372
From: Tonopah Az
I know but DK sells breather bolts with filters in them and i was wondering if those were replacement bolts
The External Breather System for that bike, with the stock A/C is the Discrete & Flexible Head Breather System, you can see it at this LINK
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