I have breakover bracket mounts. Once a month I flush them out from top port then lay them over & run them all the way out & spray them down with WD40 Silicone speay. Always have been quiet & smooth as silk.
'98 Tr20 Triton completly updated & rigged, 05 Magnum c-channeltrailer
'94 Merc 200Xri completly rebuilt & noseconed/low water pickup lower unit.