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I have a John Deere GT245 that runs for about 10 minutes, then backfires and loses power and runs at abou 70% of the normal full power. I have drained the fuel and put in fresh with sta-bil. I have replaced the plugs, ran sea foam spray thru carb but it’s still doing the same thing…..any suggestions? Update (05/04/2016) I was double checking things and found there was gas in the oil now, could that help isolate the issue?
tomahock31 check your valves (proper clearance) as well as perform a leak down test. Check for worn, stuck or broken piston rings, or worn cylinder bore. There is a whole lot that could be going on and you do want to check this in a systematic manner. My concern is the fuel in the oil. I attached the manual for the FH580V as well as the FH601V (your mower can come with a variety of Kawasaki engines). See if that will help you to narrow it down a bit. John-Deere-GT245.pdf
In this case, I would try to check the filler cap for ventilation and to clean the fuel filter. It may help!
I have a JD G100 with a 25HP Kohler in it. It idles at low speed fine, and high speed just fine with about 70% choke, and sounds good. As soon as I engage the mover or press the hydro foot pedal, it starts to stall out. If I give it into the 90’s % choke, it will stay running, but just barely. Disengage the mower and runs not bad again. Both plugs are firing and a little blackened from the excessive choke. I’ve put a new fuel filter, and didn’t change anything. Pulling the pressure side of the fuel pump line off while running there is lots of pressure to the carburetor. Any ideas where to go with this one?
