The '97 rifles are not too hard to work on as far as replacing the parts when you can find them. Not much to the inside workings, just some good old simple Marlin design stuff. Of course, the parts need to be in good shape for everything to work right.
I bought a 97 several years ago that wasn't loading, extracting, or ejecting all the rounds. The rifle was in pretty good shape cosmetically so I decided to put some time and money into it to see if I could get it working right.
I cleaned all the internal parts with CLP and soft brushes, and the bore and chamber areas by soaking it several times overnight filled with Kroil oil. The cleaning helped some but I wound up replacing the ejector spring, carrier, and the rocker assembly. Thankfully, the extractor was in pretty good shape. It's been working right and the bore, although pitted in some areas, is in good enough shape to hold 2-3 inch groups at 30 yards. Cleaning the chamber good helped with the extraction problem.
Some might disagree with my cleaning method for the bore, but in this case, it worked well for me. I wasn't too worried about hurting the bore rifling and chamber walls since they appeared in pretty bad shape. I was careful around the chamber rim and the crown. I put a well used brass brush on a section of an old brass cleaning rod and wrapped some long strands of a Big 45 pad around the brass brush. After each overnight soaking I used a cordless drill and worked the bore and chamber areas thoroughly. After the first cleaning, I could see some pretty good rifling...after the second cleaning a spent shell would almost drop out of the chamber. The third time around I used the normal CLP, brass brush, and cloth patch cleaning method. The rifle has had several hundred rounds through it so far and it's fired and worked like it should.
You might find some parts you need at Wisner's, Jack First, or Outback. Others on here will give you some good advice and information too, and just to mention it, other Marlin model parts may work in your 97.
And oh yeah, some pictures of that 97 would be nice...!