Swoosh it will gear it UP as I said in post 4. If you count the teeth on the Maney kit and then on the stock kit, you’ll get an idea of how much. I can’t remember exactly but IIRC you’re looking at around 8-10% HIGHER gearing.
Whether or not this is a good thing or a bad thing will depend a lot on your riding style and the engine performance. If you like long cruises with low engine speeds you’ll be fine. If you like acceleration you might not be. I ran a 21 with my Maney belt kit and thought it felt just right, but that’s a 920 so I can’t comment re an 850.
You rode the bike before, so just ask yourself if it felt like it would pull another tooth on the gearbox sprocket.