1. Yes it's the correct damper for an S.
2. It's probably not a bad idea to check the balance on a crank before fitting. However, the replacement MED ones available now do not need rebalancing, according to Graham Russell. These look like this one-
http://home.exetel.com.au/zoomini/zoomi ... GP2061.JPG
3. The crank pulley (inside damper) on my S motor looks original, but has no numbers.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
