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Kohler M20 ?
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tractorman View Drop Down
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Joined: 22 Sep 2009
Location: west central wi
Points: 1043 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tractorman Quote  Post ReplyReply Direct Link To This Post Topic: Kohler M20 ?
    Posted: 07 Jun 2016 at 7:13pm
What will cause this engine to surge/ pulsate under load   with tractor and mower 48:"
Play on 38 B 49 WF , working on D14, D15 B10, Bee 12 B110. use 185 and 190
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Steve in NJ View Drop Down
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Joined: 12 Sep 2009
Location: Andover, NJ
Points: 11641 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve in NJ Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jun 2016 at 8:42am
Bad spark plugs or wrong heat range, lean condition, dirt in the enrichment circuit, (which causes the lean condition) dusty, dirty partially clogged air filter. There's a few for starters. Check the easy stuff first. That's usually what it is....  HTH
39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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eslickl View Drop Down
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Joined: 22 May 2015
Location: georgia
Points: 16 		Post Options Post Options   Thanks (0) Thanks(0)   Quote eslickl Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jul 2016 at 5:59pm
I  had similar prob. First mine would stumble and back fire under load after running for 3 minutes, I finally blew into the fuel cell thru the fuel line and that fixed that. (something plugging the fuel out let in the tank)  Then I had a prob with running at wide open throttle with load. I have gone thru the carb and lowered the float, just a little and that has seemed to taken care of that. Have since mowed a 5 acre yard with no prob.

These are just ideas, and they worked for me.
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