the R-44 has power well beyond the MP limitations
It is not just the potential for damaging the drive train.
Several years ago I was doing some pinacle approaches with a very experienced instructor to a peak at 5500' and around 30degrees (it wasn't in the UK :-) I was amazed how the power just ran out exactly like the limit charts said it would. It was almost like a brick wall and there was absolutely no margin - a very salutory lesson.
John