Tractor just started getting LOUD - Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum
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post #1 of 5 (permalink) Old 05-21-2020, 02:35 PM Thread Starter
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Tractor just started getting LOUD

2014 Cub Cadet LTX1050 w/24hp Kohler Twin

Last 2 times I've mowed, exhaust note has gotten noticeably louder. Exhaust doesn't sound normal...higher pitched, kinda "poppy". Also seems just a little down on power, especially under more load.

While idling, I set the parking brake, got off, opened the hood, and found exhaust seems to be leaking around the area where the muffler/manifold bolts to the head (passenger side). I replaced the exhaust gaskets (they were worn out), still loud. Doesn't seem quite as down on power, but can still feel it under a load.

Muffler looks OK, no rust, no visible holes or damage. Kinda stumped.

Like new condition, only 156 hours. New plugs & fresh oil change at start of this season. Compression is great.

Possible muffler is shot? Maybe where the muffler pipe is welded to the manifold flange. I must be not seeing something.
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post #2 of 5 (permalink) Old 05-21-2020, 11:13 PM
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Hi Dee,

To find out some more information, has it been harder to start or had any backfiring on shut down or when you start it up at all? I had a Kohler CH22 v-twin on a former machine that had a spark advance module fail and had a similar symptom of the exhaust note changing. I thought it was a fuel related issue but no cleaning of the carb or fuel system solved the problem. It turned out the ignition advance system failed and was throwing the timing off.

It sounds like you've already done some elimination. Done the fuel filter before? They can clog and be source of power loss. If you feel comfortable taking the carburetor apart, it wouldn't hurt or at least try running some fuel treatment through before moving on to the ignition.
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post #3 of 5 (permalink) Old 05-23-2020, 07:20 AM
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post #4 of 5 (permalink) Old 05-26-2020, 06:52 PM
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Just double check to make sure the exhaust manifold bolts are not loose. I have have it happen to me twice. I have since put a small dab of loctite on them. I have had to replace one of the bolts each time.
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post #5 of 5 (permalink) Old 05-26-2020, 09:16 PM
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You may want to check if you are actually running on both cylinders....Yes, sometimes it can fool ya...Try pulling each spark plug wire off while eng idling...Use insulating should notice a definate drop in RPM when each cyl is shut down...If one does not cause the's dead and you'll need to investigate just that cylinder , coil, valve adj, etc...
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