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Engines run by burning gas fumes- fire is hot- exhaust is therefore hot. Hot gases running through metal pipes will make the metal hot. Hence the reason for "Hot, do not touch" stickers on many small engine exhausts.

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Q: Older Briggs and stratton 8hp horizontal shaft runs fine but the exhaust heats up to red hot in about 40 seconds you have checked the exhaust and it is clean and in good condition why is this?
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