It doesn't have a key in the keyway it has a large washer and screw to hold it on the gear??
SOURCE: 2002 Yamaha road star midnight star have from loud
Do not run it in that condition because it is going to cost a lot more to fix if it goes completely. it sounds like a valve is dropped or a bearing spun or a rod is bent or a compression/oil ring may be broken-but ANY of those will be a lot cheaper if you do NOT start it again and either tear it down yourself if you know how, or get a certified mechanic to do so. Good luck!
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