flutters

2500rpm flutters UPDATE I just boought a 97 vmax. Stock box & jets. Kerker 4 in 2. 9900 miles. Problems: 3000-4500rpm blog...Fixed thanx VMAXFORUM! Rusted gas tank & trash in carbs. New filter, new tank. Cleaned fuel pump & carbs. Carb sync. Oil & filter changed. FRAM, Castrol 4 stroke 20w-50...