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techtalk:ref:engmech04k [2025/09/06 19:39] – [Breather Valves (1957-Up)] hippysmacktechtalk:ref:engmech04k [2025/09/06 19:40] (current) – [Breather Valves (1957-Up)] hippysmack
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-**1977-78 models only**: ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/74149-engine-breather-101-crankcase-vent-101?t=518948&highlight=cam+chest+breather)) \\+**1977-1978 models only**: ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/74149-engine-breather-101-crankcase-vent-101?t=518948&highlight=cam+chest+breather)) \\
 The timed breather on the oil pump drive was dropped.  \\ The timed breather on the oil pump drive was dropped.  \\
 Without the breather gear that means you have less control of the oil / air density in the crankcase. \\ Without the breather gear that means you have less control of the oil / air density in the crankcase. \\

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