Yeah, the centrifugal clutch weights are lined, sort of like a brake shoe... As far as I know there are no products available to reline them, so they have to be replaced when they wear out. Generally the drum must be renewed when the weights are, because those linings wear grooves into the drum over time... new weights require a flat and smooth drum surface having no wear. Best practice is to buy them all as a matched set... which nowadays on the TRX350s means buying used parts that came off the motor together, then making sure that the drum endplay matches... or scrounging for a "like new" drum and running the best weights you can find.
In the MICHIGAN corp for an ATV off road vehicle sticker, the parasite wants fed every year of course. I forget the fee, but I think it was between $35-$40 the last time I fed them. For sleds it is worse... the parasites want a registration fee every 3 years, plus a $50 per year trail pass fee. I stay off of their designated "trails"... LOL