Yes i am sure , my flywheel is lightened from standard 11kg down to around 7-8kg, it does not affect the idle at all, it's no different pulling away ie doesn't stall if you don't give it enough revs (the ultra light flywheels may have this problem), the engine revs smoother because of less rotating mass and it definitely has less engine braking, the engine braking just takes a little getting used to