NEW YORK, March 9 — Burger King Holdings Inc expects lower third-quarter revenue and restaurant margins in the US and Canada as bad weather in the central and eastern United States kept diners away.

The fast-food chain operator said today over 75 per cent of its US and Canada segment’s restaurants are located in those regions and said the segment’s comparable-system sales fell 8.2 per cent in January and February from a year earlier.

Yesterday, Archrival McDonald’s Corp reported a better-than-expected 4.8 per cent rise in February sales at established restaurants as Asia helped offset softness in the United States and Europe.