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FWIW, I replaced the chains on my SC when I split the case at around 220,000km. I am conscious of sprocket wear on motor cycles and usually replaced sprockets - but I did not replace the SC timing sprockets. I can only assume no discernable wear. Some 60,000km later I have no chain tension issues - I fitted the carrera tensioners at the time.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
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