Question about Troy Bilt 5.5hp Self Propelled Mower

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Flywheel? I have a similar problem. I will try the flywheel key bent suggestion but am wondering why that would cause the problem and how the flywheel key would get bent in the first place?

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  • Chuck
    Chuck May 11, 2010

    I
    have a similar problem. - Similar to what? I will try the flywheel key bent suggestion - Suggested by whom and in what context? but
    am wondering why that would cause the problem - cause what problem? and how the flywheel key
    would get bent in the first place? - They normally don't get bent, they usually shear in half and is usually caused by the blade striking something other than grass that stops the engine violently

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THE BENT KEY CHANGES THE POSITION OF THE FLYWHEEL IN RELATION TO THE COIL SO THIS THROWS THE TIMING OFRF. BENT KEYS HAPPEN WHEN THE BLADE HITS SOMETHING HARD WHEN RUNNING LIKE A BIG ROCK OR A PIPE. HOPE THIS HELPS YOU

Posted on Sep 26, 2009

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Rotary gas mower bent crankshaft? Hit something really hard won't start.


This sounds like you sheared the key at the flywheel. The flywheel will have to be removed to replace the key.
Here's a how-to video -


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If this is a push type mower, most likely is has sheared the flywheel key and bent the bent blade caused the vibration. The blade will need replaced and likely the flywheel key.

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I have a 12.5hp briggs on a riding mower, hit stump damaged shaft key, removed flywheel and replaced key I still have no compression. Is this a timing problem? if so how do I set timing?


You can't set the timing, the flywheel is locked to the crankshaft via the key.

If you don't have compression, you may have twisted / bent the crankshaft as well, or the camshaft was damaged (though this is rare).

Why do you say that you have no compression? Did you put a compression guage onto the engine and spin it with the starter?

Does the engine happen to turn slower than before when you try to start it? A bent crank shaft can cause it to turn slower, and if it turns too slow, the compression release (if equipped) may not disengage which would cause a loss of compression.

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1 Answer

Troy-Bilt Mower is running real slow like its clogged dont know not a mower expert, need help please before I take it to a mower expert.


If you can, check the flywheel key. If it is bent but not quite broken, it can cause slow operation. To do that, take the starter off the top of mower. Take off the big nut on the flywheel. Find a nut of the same size and place on the thread you took the nut off, but only a few turns. Hold the flywheel with one hand, lifting a little, and tap the nut with a hammer with the other hand. The flywheel should come off. Look at the key, it holds the flywheel to the shaft. If it is bent or broken, that is the problem. Replace it and go about your day! Good luck...Lee

Sep 25, 2009 | Troy Bilt 5.5hp Self Propelled Mower

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