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Hello, my name is***** will assist you.
You may have several different items going on. When slowing down, if you did so quickly, you could have been hearing the clutch slip inside the gear housing. This would be normal on a rapid slow down. The sound in the vid, actually sounds like reed slap from an over speeded engine. There may be one or more bro***** *****s inside the intake. That would also count for the power loss. Remove the carbs and get a good look at the reeds, make sure that they are still there and intact.