Kohler CV740 running rough under load.

rwhelipilot

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May 20, 2016
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I have a Hustler 927806 with a Kohler CV740 engine.
I bought this mower used and have been restoring it and now that I have it running, there is a problem with it running rough under load.
It runs fine with full throttle and no load, but if I put some load on it such as blades engaged and going uphill, it starts running really rough.
My first thought was that it was starving for fuel. I had already replaced all the fuel lines, tank strainers, selector valve, and filter during renovation, so I then replaced the fuel pump.
The problem persists, so I had a new carburetor on the shelf and installed it.
The problem persists, so I went to the ignition coils. Someone had already replaced the DSAM system with the 25-707-03-S MDI kit, but I replaced the coils AGAIN.
The problem still persists, so I am now leaning toward a valve issue. Perhaps a valve is sticking, not seating, or a hydraulic lifter is bad.
That is the only thing I can think of that could be the issue, now that I have replaced about everything else.

Any thoughts???
 
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