I've had the needles out and checked the o-rings, they're not damaged in an obvious way. I'll be fair, I don't have much to compare them to, but they don't feel as tight as they should be, so could be worn.
One of the engines (and its carb) is less than six months old and I find it weird that it's happened to the other (which I bought second hand) at the same time.
I'm keen to find out what it is that might have caused this (after run?) and obviously avoid doing it again, or is it that the o-rings just need replacing every few months?
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