Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 82; Flight Crew Type 790
Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem
Aircraft; Human Factors
I was pilot flying and set thrust for take off; pressed the TOGA button to engage take off thrust; I noticed right thrust did not fully advance. I called for check thrust. Captain noticed that the no. 2 engine would not achieve takeoff thrust. He called 100 knots but I noticed he was heads down at the engine gauges and I called V1 I achieved Vr and he called for a rejected takeoff. I said 'negative we are passed V1'. He pushed the thrust levers to full thrust and we rotated without incident. I disconnected autothrottles and was able to achieve climb thrust for the climb to cruise altitude. At cruise the Captain called Maintenance Control to discuss the issue and they told us that the aircraft had a similar incident on [previous month]. We continued the flight without incident and debriefed the situation at cruise. We talked about the fact that we were such a light weight and the speeds V1 and Vr came so much earlier than normal.
During takeoff; the PF (Pilot Flying) called for Set Takeoff Thrust.  The autothrottles advanced the left and right thrust lever toward target N1. Engine 1 attained takeoff N1; however; engine 2 would not attain the called for value. The PM (Pilot Monitoring) advanced the engine thrust lever for the right engine toward the firewall stop; but the engine would not respond with a higher thrust setting. Due to the extremely light weight of the airplane; V1 was attained very quickly and after the problem was sufficiently thought through. The takeoff continued and was within normal parameters. The Captain conferred with Dispatch and Maintenance Control above sterile altitude. The flight crew; in concert with Maintenance Control and Dispatch; elected to continue to ZZZ1.  No further anomalies were encountered.
B737 flight crew reported number engine low N2 during takeoff roll and subsequent crew response to an uneventful takeoff.