Harley Davidson Evolution Oil Breather

Top breathing engines breath or vent through the top breather bolts which are threaded into the heads of a Harley Davidson motor.

Harley davidson evolution oil breather. Heres a drawing depicts the umbrella valves contained within the middle rocker box. In earlier case breather model engines the oil would pour into the air filter if the bike had been sitting for a few months. From breather hose which eliminates engine oil from collecting.

Harley Evolution Engine Breather Diagram Pii Organisedmum De Harley Davidson Oil Pump Diagram Wiring Schematic Diagram Harley Evo Oil Line Fitting Creativehobby Store. That much blowby and oil carry over is an indicator of poor ring sealing. In earlier case breather model engines the oil would pour into the air filter if the bike had been sitting for a few months.

48 out of 5 stars. Not only that but we have them all in-stock and ready to ship to you today. Most Evo Twin Cam models that require Breather Kit features chrome breather cups that have built in.

Due to EPA regulations since 1985 Harley-Davidson had to move their crankcase breather tube to the air cleaner. It is critical to maintain the proper pressure in your Harley-Davidson Sportster engine. I vote rings and cylinder sealing.

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. This was done in an effort to reduce the amount of oil that gets into the air filter.

Do a leakdown test on it. Fast Free shipping and the best customer service. More efficiently by promoting unrestricted breathing.