well, what kind of bike and how fast did you go? how fast do you want to go? the governor removal will allow the motor to rev higher, but doesnt mean it will get there any faster... IMO... the first motor in my project (now in the wifes kart), had billet rod, billet flywheel, cam, springs, carb upgraded jet, etube, air filter, custom exhaust, etc. top speed 45 mph, the sprocket setup would be the limit there... in the wifes kart same motor, over 50 mph before letting off...
depending on your bike and setup, the motor may not be the limiting factor, at this point... but if you want to rev high and produce more torque (to get anywhere near 60), I believe you will have to do more than what youve done...