Lean fuel on Kohler Courage SV620

Troyhorsexp

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I have a Troy Built Horse with a Kohler Courage SV620-3215 22 HP engine that is just now running lean. It starts out fine but after a few minutes, under load, it runs lean. I've cleaned the fuel tank, replaced the fuel filter and cleaned all fuel lines but the problem persists. I'd like to remove the carb, clean that and replace the fuel pump, but I can't remove the carb because the low fuel solenoid hits the frame.
So two questions: 1. What do you think my fuel problem is and 2. how do I remove the carb from the engine short of removing the engine from the frame.
I've had this mower for 3 years and this is the first problem I've encountered.
the carburetor is mounted to a spacer , the bolt on the spacer comes out and allows you to swing the carburetor up and out . the right bolt on the carburetor is only locked in on the back of spacer . I know I am late on this thread but I didn’t se it mentioned yet . Just spent the day with my lawnmower and failed carburetor .
 
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