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@MrE
Going smaller still (Bown 50 and Trojan Mini Motor) fresh petrol works better than older (3 or 4 months old) - with less than 3 h.p. between the two bikes, any loss of performance is soon noticed.
Old petrol is likely to be more of a problem with a low use machine that claims up to 240 m.p.g., but maybe also with a bike that has been standing over the winter ?