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flubber

exhaust valves, do they close at the same time?

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Mine dont. The one on the right closes after the left one. Then after its closed it opens for a bit(very shortly) when the other one is closed. Weirdest thing I've ever seen.

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I found it, its the auto-decompressor.
:thumbsup:

The auto-decompressor disengages at around 900 rpm. At any rpm level below that, it holds one of theexhaust valves slightly open to ease starting. But you already knew that... :ride:

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