35hp, 1978 Evinrude has been sitting for 3-4 years. I changed the plugs, cleaned the carb and greased all the fittings. When I attempted to start it for the first time it turned over but the shaft is spinning. Made sure the handle was in neutral several times. Each other attempt the water in the barrel churns like heck. I only let it run a minute or so before shutting down as I know very little about the motor but know it should be started in neutral. Please help..Thanks Jim