1982 XS650 Heritage Special - Decel popping on one cylinder

fenbrancis

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If the air isn't leaking past a valve, the valve sealing (lack thereof) is not the source of the "popping"
If I’m reading you right: when you do leak down test on cylinder at TDC compression stroke and you had a leaky valve it would not be seated and could cause the popping.
 
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