Hope someone can help dont know how i lost the half moon key when i took magneto off to put new one on took everthing out to clean it up lost it does anyone know what size it is
Shouldn't ever find it's way into the crankcase if you have everything normal intact. There are some rubber seals that seal the crankcase off from the outside to make sure crankcase compression happens otherwise you'd have a crappy running motor and probably be getting oil on the magneto/clutchUse a magnet to see if it could be stuck to the grease on the motor somewhere. Once mine came out while I was riding it and when I got home I found it stuck inside. I happened to have one of those antenna things with a magnet on the end and I put it around the engine sprocket, pulled it out, and stuck to the magnet I found my woodruff key. You don't want it to find it's way into the crank case.