You could be just in töo high a gear when you nail it.No sound.
I thought it might be it slipping under load. Symptoms I have are only under this condition.
Rpm around 2800. Then under hard acceleration the bike almost feels like it's bogging. Then around 3600 rpm it feels like 4 barrels kick in. If you know what I mean.
Checked fuel pump
Was thinking that the cogs on the compensator where just not right enough and moving under heavy load
Doesn't do it on wide out throttle from a stand still or when I have the rpm in higher level in gear.
Try going back a gear.