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

    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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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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Why did it start with a big pop and smoke and the cord was shaking like crazy?

my guess would be, first replace the spark plug and try again as a new plug can do wonders. is it hard to pull the rope? if it is it sounds like you may have hit something that has sheered the flywheel key. and possibly bent the crankshaft. to check the fly wheel key you must take off the plastic cover on top of the engine, remove the metal cover to get to the engine, remove the starter bell on top. it has a big nut recessed, clean the crankshaft so you can see the groove in the shaft and the flywheel. these should be lined up perfectly. the little aluminum key should be right between the two. if it looks like they are off or twisted a little. this is your problem. take out the key and line the notches up and replace the aluminum key with a new one. reassemble and try to start it. this should work. if it does run but shakes really bad its possible that the blades are bent or the crankshaft may be damaged. good luck.

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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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The flywheel key maybe broken or bent causing the timing to be off. Remove the flywheel and you will see a small key about 1/2" x 1/8".

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Hi, if you clean up the damaged flywheel and fit it back in the correct position by lining up the original key position the taper will hold the flywheel. The only purpose of the key is to locate the correct timing position. It helps to bed the flywheel taper and shaft with grinding paste first. I also apply bearing loctite to the taper when installing.Regards Phil.

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No start push mover Briggs motor 6.75 horse 22" blade. Let neighbor borrow. Lol the blade is bent pretty good. The engine turns over. Upon pulling the cable the mower turns over then recoils the cable back...

you have a sheard flywheel key - if have spark it will be at wrong time
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1 Answer

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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This usually means a bent or sheared key in the flywheel. Remove the shroud exposing the flywheel buy a 6" flywheel puller and remove the nut for the flywheel and attach the three jaw puller remove the flywheel and replace the flywheel key. The only other thing that causes this popping through the carb is a burnt intake valve this is a job for a lawn mower shop.

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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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