1992 onan on board generator operation startup

Also, you may want to exercise your generator more often. Assuming it's the original generator, 211 hours on a 23 year old generator means it is not used very often.

Some may disagree but, I think it's better to run it under a load every month or two than to leave it sit unused. It will keep everything lubricated and working properly.

And of course, Change oil and filters as needed.