The elusive 2mph... These stock 66/80 pull a 36T no problem, most of the time. Should get you above 30mph easy and cheaply. I have a 32T, and it cruises half throttle 35mph easy, tops at 44mph on a good day if i'm lucky, and gets to 41 mph regularly. Also required a SBP pipe, slant head, C.E. Intake, CNS carb, plug boot/wire/sparkplug upgrade, taller exhaust port, and port matching. TomTom verified mph. With real and professional porting, where data and actual math is used, These things will fly. Check pirate cycles vids out.