425 backfires and spits fuel out of the carb


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425 backfires and spits fuel out of the carb

Max My 425 spits fuel out the carb and runs rough. You cannot turn the throttle down past half without it dying. Gets worse under load. I have checked the plugs and coils. spark is good. Checked the connections from ignition module to coil and time delay. All seem good. Any ideas? I am going to do a compression test tomorrow when I get my truck back.
Max

Max Forgot the most emportant part. When I disconect the left spark plug wire there is NO CHANGE in how the engine starts. If I disconnect the left the engine dies instantly. This problem also happened overnight. Parked it and it was fine. The next morning it was horrible.
Tim Boisvert Sound like a compression test may answer your 2nd question as to why it dies after you pull the left plug wire. It may be an intake valve not seating or a valve seat came loose. This is just my guess. Ever set the valve tappets, how many hours on the motor?
compression I checked the compression and the right cylinder and it was 150 psi. The left was 0 psi. So I pulled the left valve cover and low and behold there is a push rod lying there out of its rocker seat. I don't have time to deal with it myself and it is a company tractor so it got loaded in the back of a Toyota Tacoma and taken to a shop. Man was that poor Tacoma loaded down. Thanks for the response. I was hoping it was something simple and easy but alas.

jim k Is that a 20 hp kawasaki engine in the 425? I have a 18 hp in a 345 and it has has been dumping fuel into the cylinders since it had less than 100 hrs. There are others who have posted similiar issues with the 20 hp kawasaki. The dealer has replaced parts but has not been able to fix the problem. It has been in 6 times ..every 30-40 hrs. It isn't "bad gas" that is for sure.


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