Harley Davidson Evolution Oil Breather

Ive read about this being a problem if they sit but I ride it a few times a week.

Harley davidson evolution oil breather. An internally broached allen allows for a quick and hidden installation method with the stainless breather element and circlip finishing the job. As the motor turns the oil is pumped out the case breather not sent back to the tank. In the following drawing the top arrows are pointing to the oil return oil.

89 Harley FLTCU oil coming from the crankcase breather tube and. 8 Aug 12 2019. 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 Timed Breathing Explained. It is critical to maintain the proper pressure in your Harley-Davidson Sportster engine. Find the SS Crankcase Breather Reed Valve for 1993-1999 Harley Evolution Dyna FXR Softail and Touring models at Get Lowered Cycles.

That is called sumping and happens because the check ball in the oil pump becomes stuck does not seat allowing gravity to empty your oil tank into your. Due to EPA regulations since 1985 Harley-Davidson had to move their crankcase breather tube to the air cleaner. Features an internal oil baffle that allows the oil and air to separate.

That much blowby and oil carry over is an indicator of poor ring sealing. Most Evo Twin Cam models that require Breather Kit features chrome breather cups that have built in. Rick since 1994 Harley has used what we call a head breather system in that the crankcase breathers are located in the heads.

The dark circles between the two sets of arrows are the umbrella valves. This is an age old problem for the Harley engine. The same goes for pushrod tubes.