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Popping on deceleration is a lean idle condition. With the throttle closed you are on the idle circuit. Each carb will have a needle valve you can adjust. A lead plug could cover the valve or screw head, that EPA made manufactures install plugs to keep you from being able to make your machine run right. That being said, if you are idling at 3000 rpm when you release the throttle I would say that could be your problem, fix that before you worry about the popping. High idle could be like some have mentioned, a vacuum leak, sticky choke, sticky throttle, sticky throttle cable, look on the intake side for the leaks. If it were a head gasket I would think you could hear it blowing on the compression stroke. Also if water-cooled loss of coolant due to a bad head gasket. Check the Ducati forums.
Hope this helps,
Steve
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1972 Dodge Challenger
2011 Raptor
2013 Road King 110th Anniversary
2014 Corvette Z51 stingray
Single after 27 years married.
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