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What Do Breather Bolts Do On A Harley-Davidson?

Summary by Jalopnik
Breather bolts replace the closed-loop crankcase ventilation system on Harley-Davidson bikes and send blowby to into the atmosphere instead of the intake.

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What Do Breather Bolts Do On A Harley-Davidson?

Breather bolts replace the closed-loop crankcase ventilation system on Harley-Davidson bikes and send blowby to into the atmosphere instead of the intake.

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  • 100% of the sources lean Left
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Jalopnik broke the news in on Sunday, November 30, 2025.
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