Old Evinrude 70 idling far too fast
I have an old Evinrude 70 that was bought as "hopefully OK". I finally got it on the boat and tested it yesterday and it ran nicely, but idled far too fast. I am pretty pleased it ran at all and stunned how easily it started, but not sure what to do about the idle. I can't find an idle adjust screw on the carbs. Manually closing the throttle linkage so no chance of friction, definitely fully closed, etc doesn't help. The engine manual I have suggested either fuel pressure or air leakage problems. It seems to be running nicely, so would guess fuel/air mix is OK, which may mean neither excess air or fuel?
When I disconnected the fuel line to drain the carbs it ran as normal, sped up a bit as fuel running out (getting lean) and then ran at a nice idle to a while, before speeding up a bit and stopping! The engine is an inline 3 with one carb/cylinder. Carbs are very basic. Anyone got any ideas?