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    Air-cooled Yamaha 5hp - alarming engine sounds

    I run an old but venerable air-cooled single cylinder 2 stroke Yamaha 5 - not sure of year of manaufacture, presumably 1970's - model 5BCS (european model - 100:1 gas/oil mix)- maybe someone can guess -<br />My main problem is that it has started making an alarmingly loud metallic banging noise...
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