U should still be able to shift gears by rotating rear wheel back and forth. Does wheel rotate freely at neutral?(indicated on gauges). If not, the plates have hydro-wedged themselves together. You can break free by rocking bike back and forth several times. You shouldn't be able to lift clutch arm that comes out of clutch cover. without clutch cable and lever u shouldn't be able to make clutch disengage. It sounds like the pinion and gear inside cover and at end of clutch assembly are NOT engaging. Intermittent spark may be due to poor frame ground contact after painting. Thoroughly remove paint from frame ground point. This year of machine may also have a strap ground from engine to frame. Make sure the contact areas of this is clean and free of paint as well. And as always on older machines, START WITH A FRESHLY CHARGED BATTERY. A loose connection in wiring can cause symptom as well. Insure the battery cables are absolutely installed and making good , clean contact.