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  #1  
Old 11-02-2024, 08:13 PM
mzat568 mzat568 is offline
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Location: CT
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Default 679cc efi engine

My efi engine wont get up to speed. It sounds ok at first but when i engage the mower it bogs right down and sounds terrible. I check all pulleys on deck and everything is turning with no resistance. I installed new spark plugs and replaced air filter. Any help would be great before i haul it off to dealer. The motor has 200 hours on it
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  #2  
Old 11-02-2024, 10:46 PM
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Billy-O Billy-O is offline
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Default

What model tractor/zt and make of engine are we working on?

For starters, I'm looking at fuel supply ( fuel filter?) Or a cylinder down (missing spark?)
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Two 125's and a 124 all with 42" decks
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Old 11-09-2024, 07:40 PM
mzat568 mzat568 is offline
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Default fixed I hope

Its a mtd 679cc efi on a cub cadet slx 50 xt2 tractor. I readjusted the spark plug gap. The manual says a range from .025 to .031. I was at .025 and changed it to the wider end .031. Seems like the computer likes that gap better and runs like new. Thank you
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.

MTD Products, Inc. of Cleveland, Ohio purchased the Cub Cadet brand from International Harvester in 1981. Cub Cadet was held as a wholly owned subsidiary for many years following this acquisition, which allowed them to operate independently. Recently, MTD has taken a more aggressive role and integrated Cub Cadet into its other lines of power equipment.

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