A proper vacuum synch will really a whole other level of improvement, as well as possibly resolve the clattering.
Do also check your cam chain for proper tension now that your bikes running well. Often overlooked, always needs to be right.
Thanks! Took me all day to clean the carbs and reassemble everything. By the time I had it running I was too spent to do the vacuum synch, but I'm definitely panning on it. I just readjusted the valves and tensioner a couple days ago, so that's all good.
