AVR Freaks

I have SG90 servo motor purchased from ebay.com. I wrote below code, but I am able to get swing of 90 degree instead of 180 degree. I verified that servo is of 180 degree by running arduino code. I also verified PB1 pin that PWM is of 50 Hz and ON time changes between 1 and 2 msec correctly. What could be happening here? I am using ardiono nano board (Atmega328P)

#include <avr/io.h>
#include <util/delay.h>

void initialize_timer1(void);
int main(void)
{
    initialize_timer1();
    OCR1A=93;      // almost 1.5 ms
  _delay_ms(2000);
    while(1)
    {
        OCR1A=62;      //1 ms
        _delay_ms(2000);
        OCR1A=124;      //2 ms
        _delay_ms(2000);

    }
}
void initialize_timer1(void)
{
    //TIMER1 INITIALIZATION

    DDRB|= 1<<PB1; //OC1A AS PWM OUTPUT
    TCCR1A &= ~((1<<WGM10)|(1<<COM1A0)); // FOR FAST PWM mode 14
    TCCR1A|=(1<<COM1A1)|(1<<WGM11); // FOR FAST PWM mode 14
    ICR1 = 1249;  //TOP VALUE for 20msec (50Hz)
    TCCR1B |= (1<<CS12) | (1<<WGM13)|(1<<WGM12);  //PRESCALER 256, MODE 14
}