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Hustler super z muffler glowing red engine running hot

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  • Hustler super z muffler glowing red engine running hot

    I have an 04 super Z with a honda gxv670 24hp engine with 440hrs. Last week I was mowing and the muffler broke off at the exhaust pipe connection I've had the muffler welded back up and reinstalled. After mowing for about 15 min I noticed the piece that broke was red hot glowing. So far I've adjusted valves, installed new carb to intake gaskets, replaced flywheel key, cleaned carb, replaced air filter, fuel filter, and replaced spark plugs. Nothing has changed still red hot. I did notice when I had the muffler off the Shute that directs air towards the output of the muffler had a hole in it. Could my muffler be causing this whole issue? I should mention I've had a after fire when I shut down the engine since I've owned the mower for about 2 years.
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