Kohler Courage sounds like it’s gonna blow

JRD1054Cub

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Apr 11, 2021
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Cub SLTX 1054
Kohler Courage 26 725cc

This season, it has really been hurting.
Last time out, 2 weeks ago, it was doing ok. Takes a few min before it wants to start. Once started, after a couple min, with PTO engaged, it will really struggle. The engine literally feels like it’s going to explode. It will backfire here and there (not often). But I can’t tell if it’s a fuel issue. I replaced the gasoline obviously.
Or maybe an exhaust issue? It doesnt run smooth.
But when I shut it down, it takes a minute for it to wind down. Like it will not want to turn off. Like it will keep trying to start up again. Then eventually cuts off and ends with a small backfire.
I’m totally stumped on this one.
It has been sitting since around last August.
In the past couple years, I replaced the transaxle, starter, starter solenoid, fuel filter, air filter, battery this year, spark plugs, wiring, etc.
I could prob do with fuel line replacing since it’s been sitting out.
any suggestions?
 
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