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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil loss through breather pipe
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<blockquote data-quote="John Appleton" data-source="post: 16512" data-attributes="member: 760"><p>Tony, the breather we used is mounted on the magneto drive cover and uses the original cover as a lid. Within the housing is a spring loaded plastic valve, and the housing is vented to atmosphere through a 15mm. pipe. In the bottom of the housing is a 3mm hole which returns the oil to the crank case.</p><p> The operation is :- excessive pressure lifts the valve and vents oily air into the outer chamber as the pistons travel down the cylinders. The oil seperates out onto the walls of the chamber and finds its way down to the bottom, where it is sucked back into the timing chest as the pistons rise. The original timed breather is left in place as our one is only intended to work when crank case pressure is too high.</p><p> John</p></blockquote><p></p>
[QUOTE="John Appleton, post: 16512, member: 760"] Tony, the breather we used is mounted on the magneto drive cover and uses the original cover as a lid. Within the housing is a spring loaded plastic valve, and the housing is vented to atmosphere through a 15mm. pipe. In the bottom of the housing is a 3mm hole which returns the oil to the crank case. The operation is :- excessive pressure lifts the valve and vents oily air into the outer chamber as the pistons travel down the cylinders. The oil seperates out onto the walls of the chamber and finds its way down to the bottom, where it is sucked back into the timing chest as the pistons rise. The original timed breather is left in place as our one is only intended to work when crank case pressure is too high. John [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil loss through breather pipe
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