Last week I swapped hydro's in my 782.
My cork gasket was weeping a bit so I decided to replace it and while I was at it, I thought I would try a different hydro I picked up a while back to see if it was a good one.
Long story short, both hydro's are very good but the present one I installed does just as you describe, it speeds up when the lever is held past the stop. the other hydro doesn't do that.
What I did notice was that there is a difference where the hydro's mount to the differential.
The present one does not need the 3 holes in the cork gasket area,
as the swash plate in the motor is cast into the housing unlike the older style that is held in with 2 torex bolts, requiring the holes for the bolt heads
I believe the 3rd hole is a oil return.
Possibly that is the cause of the difference in the speed up as there is no oil return from the motor housing, just around the bearing.
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