Originally Posted by
Sorin
I have seen a few ones that seems broken , i didn't shift this bike for more than 15 years, was abandoned at my country house
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I agree with [MENTION=57478]repechage[/MENTION]; the truncated teeth are intentional, to improve shifting. IMO, those Shimano 600 and Dura-Ace "Uniglide" freewheels are among the best ever brought to market, much better than any Atom freewheel.
When i try to turn it clearly is not smooth, feels like sand rubbing ...and that's why i was thinking to change it , either for a new better one, either for an original ATOM. Chain will be changed for sure .
Have you tried flushing it out? Those Shimano 600/Dura-Ace freewheels have an oil port, accessible after removing the sprockets.
N.B. if you change the chain, you'll likely need a new freewheel, as new chains often have trouble seating on worn sprockets, particularly the smallest sprockets. If you do decide to replace the freewheel, I'd suggest a modern one with Hyperglide profile teeth. Mechanically, they're not as nice as the old Uniglide freewheels, but they shift beautifully, and they're cheap enough to replace if/when they give you trouble.