I run a stock a55 revival ts on 26t by 22t gears, stock air box, shortened technigas pipe up jetted with a 58 main jet. With the shortened pipe I ride at about 44 to 45 mph on the flats. I have done a bunch of airsal 67 cc kits. Much more torque and speed. You can get into the 50's without the a35 ignition set up. And you will get there pretty quick with the stock carb too.