Harley Davidson Evolution Oil Breather

In earlier case breather model engines the oil would pour into the air filter if the bike had been sitting for a few months.

Harley davidson evolution oil breather. Fast Free shipping and the best customer service. Without a reliable Harley Sportster breather kit excess pressure cannot be vented by your pistons and recycled by the carburetor. 89 Harley FLTCU oil coming from the crankcase breather tube and.

The design of the oil filter on the shovelhead uses one oil line which feeds the oil back through the filter and into the oil tank. In you 89 model the crankcase breaths from behind the oil pump through a tube that runs to the backside of the air filter assembly. This was done in an effort to reduce the amount of oil that gets into the air filter.

More efficiently by promoting unrestricted breathing. In the following drawing the top arrows are pointing to the oil return oil. 48 out of 5 stars.

Harley Sportster Breather Kits Components. Rick since 1994 Harley has used what we call a head breather system in that the crankcase breathers are located in the heads. All orders over 89 receive Free shipping.

Harley-davidson Timed Breathing Explained. Ever since the introduction of the EVO engine with breather heads and the use of high flow air cleaners breather blow by has been an issue. Top breathing engines breath or vent through the top breather bolts which are threaded into the heads of a Harley Davidson motor.

The internal passages on Harley heads need to breathe and the oil drain holes usually found in the corners of the rocker plate must be open and large enough for air and oil to move and drain. Features an internal oil baffle that allows the oil and air to separate. The evolutionâs external filter requires two oil lines.