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I have a Simplicity Legacy 25hp (sub-compact tractor) with a Kohler Command Pro. It has 1100 hours on it, so its by no means a new tractor.
It has a problem now where it will run for 35+minutes, cut really good (no extra choke or anything like that), then suddenly bog down and die. it starts right back up but immediately dies as if its getting no gas (choke helps it stay up for a little longer but not much)
I've tried
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New sparkplugs
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gas cap off (vapor lock)
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running each cylinder individually. It starts with either cylinder running seperately but still dies immediately after.
both cylinders get spark. The fuel filter has gas in it.
It doesn't smell like gas, get red hot, or make any smoke but the muffler is in pretty poor shape (original from early 00s) and it sounds like a cammed muscle-car so im guessing that is causing some extra heat. but i feel like there must be something else going on. So im wondering if anyone here has any other diagnosis steps i can take to pinpoint the issue?
I really dont want to take the carb off if i dont have to, so im planning on running a fuel cleaner. aside from that, maybe new coils?