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I am trying to figure out site... bear with me, please. If I put choke on 1/2 I can keep it running but poorly. I replaced carb no change. Acts like a vacuum leak and way too lean, but cant find it using carb cleaner. Any Ideas? Thanks Greg

4 stroke engines normally don't over-rev even with a air leak due to governor action. I suspect the fuel issue is a symptom not an issue. I would be leaning more toward a governor issue. And depending on carb jetting an over-rev can demand more fuel than the jet can deliver therefore seeming like a lean run issue.

Thanks for your reply Ile, that sounds logical. I have no idea how governors work- seems I remember a lawn mower way back when I was a kid, that used a paddle that would pull back throttle using air. I am thinking about going to our local library and reading about small engines. I have 2 mowers that over rev, this one and a small push mower.

Doesn't this go in the Kroller section?

Yeah, I guess it should be in Kohler, still trying to figure out this site. I will check - maybe debris clogging up govenor linkage? Thanks.

Yeah, I guess it should be in Kohler, still trying to figure out this site. I will check - maybe debris clogging up governor linkage? Thanks.

oops

If it revs too high, then the governor did not pull the throttle plate closed as the rpms increased.
You can get a full service manual in PDF at Kohler's web site. It covers a lot of the CV series and more.
I would look closely at the throttle linkage. The throttle plate normally is pulled wide open by a spring. The spring tension is set by how far you have pushed the hand throttle control, making it stronger to oppose the governor and keep rpms higher. When the engine starts, the governor starts pulling the opposite direction to the spring tension, and they balance out somewhere in the middle, not too high and not too low. When the load increases, the rpms drop, the governor weakens, and the spring increases the throttle plate opening to provide more power to meet the increased load. When the load goes down, the rpms increase, the governor gets stronger(with rpm increase) and pulls the throttle towards a more closed position.
It all is a tug-o-war between the throttle spring and the governor.
Your governor did not close the throttle with rpm increase. It is not working, has linkage problems, or needs to be adjusted.
Be careful if you start the engine again, as you can cause the engine to self-destruct if the rpms get too high.
tom

Greg.Rogers said:

Thanks for your reply Ile, that sounds logical. I have no idea how governors work- seems I remember a lawn mower way back when I was a kid, that used a paddle that would pull back throttle using air. I am thinking about going to our local library and reading about small engines. I have 2 mowers that over rev, this one and a small push mower.

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Will the engine idle without any choke? The governor should have no effect on a CV15 at idle. Even at high idle the governor should only affect the engine speed not the run quality. If it is indeed running lean, it's either not enough fuel or too much air. You can get the manual here free. https://www.engines.rehlko.com/manuals

The governor pulls the normally Wide Open Throttle - WOT- closed to attain idle speed.
The throttle will sit at WOT if the governor is not pulling it closed.
The run quality might be affected by the fact the engine is being started from cold, and would normally have need for a slight choke for a few seconds. If the rpms are going thru the roof immediately, my response is to try to get the rpms down and worry later about the run quality.
Put the manual throttle control at slow rpm. Look where the throttle plate is. It should be open, and able to move readily. Without governor help, even at idle setting, the rpms will be too high.
tom

Hello Greg R.,

Governor tension spring broke or came off? Without the engine running, move the throttle to the fast position. Locate the governor arm and see if it has tension on it. If it does not, the spring is not working.

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