If it it has 82 hours of MX on the engine it's could probably use rings at a minimum. I would suggest doing a compression test or better yet a leak down test so you know for sure. The service manual will give you guidance on acceptable readings.
If it were ridden on an MX track for 82 hours and it were mine, I'd rebuild it, but I like my engines to be tight and powerful. It is an incredibly easy engine to work on so don't hesitate to open it up if you think it needs it.