CRJ200 FLT CREW SEES SLIGHTLY LOW N1 DURING TKOF. MAINTENANCE IS CONTACTED WHILE CLIMBING OUT AND THE FLT CREW IS INSTRUCTED TO LAND ASAP; WHICH THEY DO.

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DURING PREFLT PROCS; IT WAS DETERMINED THAT NORMAL THRUST WOULD BE NEEDED DUE TO THE WT OF THE ACFT AND THE TEMP AT BOSTON FOR RWY 22R. NORMAL THRUST WAS CALCULATED TO BE 90.7. NORMAL TKOF PROCS FOLLOWED. DURING THE TKOF ROLL; IT WAS DETERMINED THAT THE #1 THRUST LEVER WAS FULL FORWARD; N1 WAS INDICATING 90.2. BASED ON EXPERIENCE OF SETTING N1 AND THE POTENTIAL FOR A SMALL ROLLBACK TO OCCASIONALLY OCCUR; I DETERMINED THAT THIS WAS A GOOD THRUST SETTING AS ALL OTHER ENG PARAMETERS AND ACCELERATION WERE NORMAL. ROTATION; TKOF; AND CLBOUT WERE NORMAL. CLB THRUST WAS SET AND THE ACFT RESPONDED IN A NORMAL FASHION. WE WERE VECTORED AROUND SOME TSTM ACTIVITY AND ONCE CLR OF THE WX; WERE CLRED ON COURSE. DURING THE CLB WE DETERMINED THAT WE SHOULD CALL MAINT DUE TO THRUST LEVER POS. WE WAITED FOR AN OPENING ON COMPANY RADIO. DURING THIS WAIT; A CLB WAS COMPLETED TO FL300; WITH NORMAL CLB THRUST SETTINGS AND NORMAL ENG INDICATIONS. WHEN WE CONTACTED MAINT VIA COMPANY RADIO; WE WERE TOLD TO RETURN TO BOSTON. WE WERE APCHING JFK AND SUGGESTED IT. WE WERE TOLD BOSTON WAS PREFERRED; BUT JFK WAS FINE TOO. THE DECISION WAS MADE TO DIVERT TO JFK AS THERE WAS WX BEHIND US AND WE HAD A CLR PATH TO JFK. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE REPORTER STATED THAT THE DECISION TO DIVERT HAS BEEN CALLED INTO QUESTION BY MANAGEMENT AND THERE WAS APPARENTLY NOTHING WRONG WITH THE ENGINE. THE DECISION TO DIVERT WAS PRIMARILY MADE BY MAINTENANCE.