In short, the bike has been dropped on left side by previous owner and the stator had to be replaced (probably used), 18k miles, has sputtering issue between 4-8k rpms, popcorns and shoots flames on decel. 06 gsxr750. I assume the stator is bad and not allowing a strong enough spark for the engine. But always starts up fine no problem. I started off with basics, battery connections, spark plugs replaced, air filter, oil, tps, fuel pump, vacuum hoses, and the bike isn't throwing any codes after putting it into dealer mode.