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No vent needed, the engine breathing arrangement will take care of that regardless whether it's a top or bottom breather.
You WILL need to solder a standpipe in each of oil return and crank case/tank vent fittings. Feed comes of the bottom of course but the other 2 must be above the oil line in the tank at all times. Preferably, you'd make a short "L" on each pipe and index each so they do not point at each other. Better yet, so the return points toward the fill and the case/.tank vent is pointing away from fill.
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Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
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Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
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Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
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