Reduce the weight of the piston . Often the weight of the piston makes your engine work more extra . By reducing the weight of the piston , the engine will work the bike lighter and faster. Reducing the volume of the combustion chamber . If your motor has high compression , this could have an effect on the speed of the motor and the power generated . For that you need to increase the compression of the engine . This can be done by grinding the cylinder so that compression will be much more improved . Extending the flushing hole . Mixture of gas and air entering the combustion chamber is quite influential on the motor power . More and more gas entering the better the gas density increases so much compression . You can expand the flushing hole so that more incoming gas . But the expansion of the hole should be at normal flushing , flushing means do not expand the hole too wide as this can actually make the machine broken . Adding Power . In general, electric power on a motorcycle is 6 volts . You can change it to 12 volts . In addition to the bike go faster , the lights will turn on the motor is also lighter so it is safe when driving at night . Change gears . Replace the rear gears with smaller size and lighter so that the speed of the motor to be balanced . 
