ealbertson

I have a 60" eXmark TTHP with a Kohler 23 hp engine on it. The engine specs are: Kohler 23hp CV23S Spec: 75559 S.N.: 3225503391. The symptoms are every time hot or cold, when I go to full throttle it runs rough like it is missing. I have noticed a little black smoke on occasion while it is doing this. I can just a consistently clear it up by throttling down and then quickly back up. After this it runs smooth until I slow it down or restart it. It also, most of the time, back fires when I shut it off. It will do this even when I let it sit at idle for ten or more seconds although it is worse when I throttle down quickly and shut it off. Once in a great while it starts hard needing choking and this is usually when it is warm. I have had the carb all the way apart and cleaned it thoroughly not to long ago. Also, I replaced the carb diaphragm for a different problem last year. That solved that problem. The compression is 150 PSI on each cyl. although it goes up a little slower on the left

MikesRJ

Have you checked the points, point gap, and timing?

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In GOD we trust!
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Mike - S/E-PA - 40 clicks West-o-Philly
Ability is what you’re capable of doing; Motivation determines what you do; Attitude determines how well you do it; and the measure of who we are is what we do with what we have.