Getting home fairly early from the Maidenhead rally, I decided to try the recent suggestion of boiling pistons to free stuck rings and put a couple of Evinrude pistons on to simmer. On one the rings were in that 'dangerous' condition - showing some signs of movement but just waiting to break if rushed - and the boiling worked a treat on these. But the other where the rings were solid in their grooves, seemed in pretty much the same condition after treatment - it's now gone into a jar of diesel.
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