Sounds like it's crackling way too much on the overrun. I was warned with mine that it could be lean-pop, and could eventually burn the valves. I fitted much bigger jets, problem fixed!
Mannnnn GreAt looking BiKe!! Love the color scheme!! I absolutely love the vintage late 80's to early 90's gxsrs!!! Only bike I will ride besides a honda RC30 or VFR700Please message me all the performance+modifications that have been done to it please. I am putting together a gsxr 92 as we speak...:D