FO OF ACR WDB ACFT INADVERTENTLY OVER-BOOSTED THE ENGS EXCEEDING DESIGN LIMITATIONS.

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ON 1/FRI/93 FLT X ATL TO SJU SHIP XXX. AFTER REACHING CRUISE ALT I SET PWR TO EPR ON FLT PLAN. A FEW MINS LATER WE WERE GIVEN A RTE CHANGE AND TOLD TO CONTACT ENRTE RADIO (COMMERCIAL RADIO). THE CAPT WAS HAVING DIFFICULTY MAKING CONTACT ON HF. I WAS CHANGING THE RTE AND THE FE WAS MAKING A COMPANY POS RPT. I LOOKED UP AND NOTICED THE AIRSPD STABLE AT 208 KTS. I IMMEDIATELY INCREASED PWR TO RETURN TO REQUIRED CRUISE MACH. DURING INITIAL PWR APPLICATION #2 ENG HAD AN N1 OVERSPD (THIS WAS NOT NOTICED TILL LATER IN THE FLT). ALL ENGS RAN SMOOTHLY AND PWR WAS RESET AT A NUMBER HIGHER THAN THAT CALLED FOR ON THE FLT PLAN. WHEN WE NOTICED THAT #2 N1 HAD EXPERIENCED AN OVERSPD WE WERE MORE THAN HALF WAY TO SJU. SINCE ALL OTHER ENG INSTRUMENTS WERE NORMAL AND THE ENG WAS RUNNING SMOOTHLY WE LEFT THE ENG CONTINUE TO OPERATE AND LANDED IN SJU. CONTRIBUTING FACTORS WERE THE CONFIGN OF SHIP XXX. IT HAS NO FMS LIKE OUR OTHER WDB ACFT; SO IT HAS NO CRUISE AUTOTHROTTLE CAPABILITY. THIS WAS THE FIRST TIME THAT I FLEW THIS SHIP AND THE FIRST IN A TRIPLE INS CONFIGN. ALL PAST EXPERIENCE HAS BEEN INS/FMS CONFIGN. I LET MYSELF BECOME DISTRACTED AND UPON SEEING LOW AIRSPD ADVANCED THROTTLES RAPIDLY.