I took risers off and risers and manifolds looked like new. Cleaned it up put back together with new gaskets. Replaced sea water impeller and housing which looked fine. Replaced spark plugs with oem and gapped to .035 per motor spec. Also took thermostat housing off and replaced thermostat which was bad and rusted.
Turned motor on and j initially idled fine and kept temp steady in middle at 180. Riser amd manifolds temps rose to 140 on starboard to 120 on port riser and about 10ndegrees less per side for manifolds.
In 3rd run noticed temp needs started climbing quickly. Shut it down. Risers were 170 degreed or so.
any places too look. I have a suspicion some gunk got loose and made it's way into cooling system. Thoughts appreciated
Turned motor on and j initially idled fine and kept temp steady in middle at 180. Riser amd manifolds temps rose to 140 on starboard to 120 on port riser and about 10ndegrees less per side for manifolds.
In 3rd run noticed temp needs started climbing quickly. Shut it down. Risers were 170 degreed or so.
any places too look. I have a suspicion some gunk got loose and made it's way into cooling system. Thoughts appreciated