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Reload this Page Mag 18 Backfires and Dies
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  #1  
Old 08-26-2026, 07:01 PM
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nashcub nashcub is offline
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Join Date: Jan 2010
Location: Nashville, TN
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Default Mag 18 Backfires and Dies
Hello Old Friends!

I have a 782 that I repowered with a Magnum 18 that currently has about 550 hours on it.

While mowing it will run fine for a while, but after running about an hour, it will begin to backfire through the muffler and die out. Will not restart until after it has cooled down a while.

It’s been so long since I have worked on it that I don’t know where to start. Can anyone provide input on what I should look at first?

Any ideas would be greatly appreciated.

Thank you!
Steven C.
Nashville
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  #2  
Old 08-26-2026, 07:20 PM
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If it won't start til it cools its likely losing spark. Run it till it shuts off and check the spark.
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  #3  
Old 08-26-2026, 08:11 PM
Grandpa53 Grandpa53 is offline
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Getting hot? Have you checked for debris under tins? Fire through exhaust is typically valve not seating or lean condition.
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Old 08-26-2026, 08:18 PM
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I agree with the others and I would also add that maybe you have something causing lean conditions such as fuel filter blockage or gas cap not venting.
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Old 08-27-2026, 08:25 AM
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After you check for spark, and if it has it, then check the screen inside the gas tank.
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  #6  
Old 08-27-2026, 01:48 PM
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My 1872 did something similar a few years back and it had green crap in the fuel bowl.
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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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