SOURCE: John Deere L120. When the mower clutch is engaged
Try a new seat switch,or the rio switch on the right rear of the trans-axle.
SOURCE: Engine runs fine til hot.
I think one of the intake valves, or a valve pushrod, is bent or warped. When the engine heats up, the metal expands and the valve starts sticking open. That would cause compression to be lost in one cylinder, reducing available power so things drag when you engage the blades. This would also causes air/fuel to be blown back through the intake. I think you'll need to take it to a small engine mechanic. Good luck! Please rate my solution if helpful, thanks.
SOURCE: howto replace front wheel Bearings on John Deere Mower L-130
they should just nock out with a hammer and punch
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