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SIMON;

Some bikes have Nikasil and some don't.  Without taking apart the engine, are there any markings on the heads that you would know of to tell which liners are inside?

Also, some engines are Sand Casted and some are Die Casted of the same year, is there a clear date this changed or is there another reason for the two??  Vendors, Nikisil liners, low volume production vs higher volume, etc..

Thanks in advance..