[Alvy]

Old cubby I think I remember resto thread but not sure. Anyway, you didn't mention here that you had changed the filter but only the oil. I'm assuming you changed both but wanted to make sure. If so did you use the correct filter? How bad was original oil? Sounds like it might need oil and filter again if it was bad enough to clog filter. It's hard to get all the bad stuff out in one change, might take multiple times and also some flushing with kerosene or diesel fuel

Jerkiness in a hydro is normally due to cavitation