If stater motor is turning over it could be starter motor clutch not fully engaging. You might be luck and just have to remove engine side cover, remove starter clutch, clean it up and put it back in. Or if it's seriously 'kaput', a new one might be required.
Other possable causes might be worn starter motor bushes, worn starter/clutch gears or low battery charge. Have you put battery on charge ? Try the battery first, it's the easiest, then looks like spannering time.
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rust & dust
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