I bought a 94 blaster and it was a mess so I started tearing into it and the piston and rings where good, it has amazing compression, it’s getting fuel, getting spark, so i tried to bump start it and it ran then backfired so I thought it was the woodruff key so I take the flywheel cover off and the flywheel spins when I kick it over so it’s not the woodruff key but there is metal and oil around the flywheel?? What could this mean?