Trail boss 250 case oil?

Hello, I have a 1995 polaris trail boss 250 and just pulled the motor out after having burned up the piston and replacing it and having more problems. I was wondering is there supposed to be oil in the bottom of the case at all? There is some oil in mine I am wondering if the oiler isn’t working correctly or is there supposed to be a little bit the the bottom. Thank you to anyone who can help