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Yes, I know. This is an old thread. Just wondering how the corn-head grease worked out. I use corn-head grease in the bottom rollers in two of my bulldozers. Deere used to sell it as "track & roller" grease, but changed it to "corn-head grease" in the late 80s.
I ask because I just pulled apart a Neptune 500 I got at a yard-sale for $25. Serial # 3464G. No spark and there seemed to a be lot of play when I jiggled the flywheel back and forth. So I pulled it all apart. Points are corroded and capacitor is dead. Play I felt on the flywheel is from loose piston rings. They jiggle in the piston-groove. New points were easy to find since they are in my NAPA small-engine ignition book. Same points used in many Tecumseh and Clinton engines. Carb is a Tillotson and parts for that are very common in many chainsaws. What surprised me is the gear-case. Dry and looked to be full of dirt and sand. I cleaned it up and the gears look fine. Too much play and they skip though. I need to add shims to push one bevel gear closer to the other. I have no repair info on this engine and up to now – had no idea what sort of oil or grease to use. Corn-head grease might make sense. It is made to flow when there is movement and not flow when all parts are still. It is just a 00 grade grease as I recall.