I'm trying to use this for a kart. Can I put a clutch on it? What type of shaft is this?
MPH- Please avoid starting multiple threads covering the same topic. I have merged them and deleted the empty one to keep things tidy.
Regarding your question- It may be possible to cut in a keyway and mount a 5/8" clutch. IMHO, you'd be better to either replace the crankshaft with a standard 3/4" keyed, or sell the engine and buy one that is already so equipped. You run the risk of mangling the shaft trying to cut in the keyway and therefore wasting your money o a 5/8" clutch.