From the mpu6050 header file:
// GYRO_CONFIG register
void setFullScaleGyroRange(uint8_t range);#define MPU6050_GYRO_FS_250 0x00
#define MPU6050_GYRO_FS_500 0x01
#define MPU6050_GYRO_FS_1000 0x02
#define MPU6050_GYRO_FS_2000 0x03
for example:
setFullScaleGyroRange(MPU6050_GYRO_FS_2000);
does what you want.