When the bike is in gear and engine breaking, I can hear the little crackles on the over run but every once in a while, if the rpms get fairly low, around 3k, when I roll back on throttle it makes a little thhppps sound then continues on normally. I did an engine swap a week ago because a valve snapped and totally destroyed my original motor. The original motor had that same characteristic. I’m unsure why this hiccup happens. The throttle body is still the same. Could there be an issue with fueling? Running to rich?