Question about Harley Davidson FXD Dyna Super Glide Motorcycles
In all probablility, the oil is not being blown back through your carb but rather is being blown into your carb. In 1994, Harley went to a crankcase breater system that we refer to as "head breathers". If you remove your outer air filter cover, you'll see two large bolts that screw into each head of your engine. These are "union" bolts in that they are hollow and allow excess crankcase pressue to be blown into the air filter for recirculation through the engine to be burned. The EPA started requiring this back in late 80's but the lower crankcase vent system that Harley used caused even more problems and was changed to this system.
Posted on Oct 08, 2010
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Posted on Jan 02, 2017
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