Backfiring?
 

We stopped a a MAc machine yesterday, and noticed the exhaust was making a popping noise, like litle backfires. We are not idling rough, any ideas on what's going on?

I don't think it's a sign of anything wrong. I've always had that too. Sometimes it's worse than others, but I've never had problems.
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KissMeWell

that's perfectly normal, it's a characteristic of a rotary engine ;)

Thanks!!