Attempted fuel theft?

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[quote author=fazersharp link=topic=16503.msg190057#msg190057 date=1428345156]
Are you sure that it dig not just work its way out on a ride and you have only just noticed it

Actually I've found one which had lodged on top of the radiator, but the other one is nowhere to be seen

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Sounds like they may have come out as  fazersharp suggested, otherwise I'd have thought the other would have been found.  If not I'd say you were lucky they didn't do more damage for the sake of it