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350TSS · 20-04-2018, 08:26 PM

Presumably that larger hole allows more air underneath the diaphragm which enables the slide to shut. It is quite surprising it does shut given that there would be negative pressure there from the intake stroke.

20-04-2018, 08:26 PM	#6
350TSS Too much time on my hands member Join Date: Jan 2013 Location: Shipbourne Bike: M900 Posts: 1,419	Presumably that larger hole allows more air underneath the diaphragm which enables the slide to shut. It is quite surprising it does shut given that there would be negative pressure there from the intake stroke.