AN MD80 REJECTED TKOF DUE TO #2 ENG SLOW TO MAKE TKOF PWR; SECOND ATTEMPT NORMAL.

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ON MAY/FRI/97; THE CAPT AND I WERE CLRED FOR TKOF ON RWY 26R AT ONTARIO ARPT; CA. UPON ADVANCING THE THROTTLES FOR TKOF PWR THE R ENG SPOOLED UP MUCH SLOWER THAN THE L ENG. WHILE WE WAITED FOR THE R ENG TO SPOOL UP; VALUABLE RWY WAS BEING USED UP; AS WE COMMENCED A ROLLING TKOF. WHEN THE R ENG SPOOLED; THE CAPT DECIDED TO EXIT THE RWY AND TAXI BACK FOR ANOTHER TKOF AT THE BEGINNING OF THE RWY. THE CAPT AND I THOUGHT IT WAS THE BEST ACTION TO COMMENCE THE TKOF AT THE BEGINNING OF THE RWY; AND EXIT THE RWY WHEN WE DID; BECAUSE OF THE VALUABLE RWY BEHIND US AND THE ACFT ENGS WERE NOT SPOOLED UP TO MAX TKOF PWR. LOOKING BACK ON THIS WHOLE INCIDENT I WOULD DO THINGS DIFFERENTLY. AFTER DISCONTINUING THE TKOF WE SHOULD HAVE RETURNED TO THE GATE AND HAVE MAINT LOOK ON THE ENG BEFORE PROCEEDING FOR ANOTHER TKOF. ALSO; MY ATTITUDE TO ALWAYS LOOKING FOR REASONS TO CONTINUE HAS BEEN GREATLY AFFECTED BY THIS INCIDENT. THE SECOND TKOF WAS NORMAL AND THE JOURNEY TO OUR DEST WAS UNEVENTFUL. HOWEVER; THE CAPT DID WRITE UP THE CONDITION AFFECTING THE R ENG WHEN WE ARRIVED TO OUR DEST; AT THE REQUEST OF THE ENG MECH UPON SPEAKING WITH HIM.