I have an 04 Exmark Lazer Z EFI (book says serial #440,000 and higher) , Kohler Engine CH740-0045, When mowing it runs fine for the first 30-45 mins. After that when you move left arm in reverse, then to go forward again it loses power an acts like it wants to die, if you move arms quickly to Neutral rpms pick back up and you have to ease forward to keep rpms up. Once you get moving it runs fine down strip until turning again. If I let the mower sit for 5 mins or so, it will run fine for 5-10 mins then start doing it again. It does seem to only be doing it with the left arm primarily, but sometimes does do it with the right. Also does it without pto engaged. Dealer couldn't replicate the problem when taken to them and one thing they said it could be is an O-ring in the pump. Oil Level is fine, hydro fluid and filter changed at end of last year level good as well. has approx. 500 hours. any help is greatly appreciated as I don't want to take back to dealer and have them tell me same again.
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