So, I have had an 07 night rod special for about 6 months it had some issues from the previous owner, but now that I have them fixed I noticed with the power my bike doesn't seem to accelerate consistently from 0-60, it is usually more towards what I feel one would expect when its cooler outside(it feels like it gets the proper acceleration when its cold outside but seems to need more rpm when its hot). So other issues i noticed it loses the acceleration going from about 78-81mph area and gains it back after 1-2 seconds, but only at that speed. Occasionally it will take a little bit for the rpms to go down when I am holding the clutch lever usually when its hot. But the most recent thing I noticed was a sort of POP/crack(very distinct and audible sound even at 80mph) sound from the engine/clutch area at the same 78-81 speeds, it happens when I'm accelerating harder than usual. The POP only happened twice, on my two most recent rides, back to back at that same 78mph area.