93 polaris xlt 600 triple missing plug?

I have a 1993 polaris xlt 600. I was cleaning my sled and noticed that I can see my flywheel through a factory made hole, located on the front right lower part on the engine (by the recoil) my question is

1. Should there be a plug in the hole?
2. Should there be an oil in the bottom of the engine?

93 polaris xlt 600 triple missing plug?