Commercial Fixed Wing
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Distraction; Situational Awareness; Training / Qualification
Deviation - Speed All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem
Environment - Non Weather Related; Human Factors
Passing FL230 in VNAV Climb FMC airspeed was set at 310 KIAS. As airspeed approached Vmo; power was reduced but the airspeed briefly passed Vmo by about 5 knots and for 3-5 seconds. Pilot flying was new to airplane and neither of us are flying much.  Pay closer attention to FMC inputs; fly more!
Entered climb speed in FMS of 310. Previous Econ climb was 257/.81.  I failed to enter .81 after 310/. As the aircraft climbed speed approached MMO at FL 230. Adjusted speed in FMS but the aircraft was empty and continued to accelerate. I manually reduced the throttles; but not enough we exceeded about 5 knots before we slowed down.New to the aircraft. I had not flown since OE ended. Fly more. But we all know the environment.
Air carrier flight crew reported an over speed during departure and cited lack of flying as a contributing factor.