Backfire when cold

67Dart273 said

Under what conditions does this happen? And this IS? out the exhaust and not the carbs?

Timing or idle mixture, off hand, and what do you call "cold?" Outdoor temp in F?

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If I haven't started it for a couple of days, and the engine is cold it backfires through the exhaust if i give it any gas at all. It did it this morning and it's summer here in Australia, temp at the time would have been around 77F.