My
engine is a 2GMF. I did call Yanmar Corp. yesterday and oddly they said the output shaft on the P has a 7 degree angle on the output side. Also, the input shaft sticks out more on the A over the P from the bell housing in a side by side
photo a shop sent me. So. maybe the flywheel is different between the 2GM/2GMF vs the 2GM20F.