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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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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Sometimes difficult to pull will snap back after afew pulls

Here are a few causes for that symptom. Engine is out of time (sheared flywheel key), OHV engine: valves out of adjustment. Bent crank or bent blade. Oil in the combustion chamber. Hope this gets you in the right direction.

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1 Answer

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...

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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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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

2 Answers

Poulan PBV200LE 2 cycle Blower will not start


>>From your Description it Sounds like the Flywheel Key was Damaged when the Mulch Hit the Impeller.
>>Replace the Flywheel Key.
>>The Following is a Basic Instruction File I made for Removing the Flywheel and Replacing the Flywheel/Flywheel Key.
>>Remove the Cover that Houses the Starter Assembly.
>>Remove the Spark Plug and Use a Bolt the Same Diameter and Threads as the Spark Plug and About 3" Long.
>>Thread the Bolt into the Spark Plug Hole Until it Engages the Piston.
>>Slowly Tighten the Bolt Until you have Locked the Piston and it Does Not Move. **BE CAREFUL A LOT OF TORQUE IS NOT REQUIRED. PISTON DAMAGE CAN OCCUR IF TO MUCH TORQUE IS USED ON THE STOP BOLT**
>>Now Remove the Flywheel Nut.
>>Use a 3 Jaw Puller and Attach the Puller to the Flywheel.
>>Look for a Puller with Flat Jaws. These Slide Under the Flywheel and Allow for Easier Removal.
>>Tighten the Puller and then Hit the Puller with a Hammer. Tighten and Hit Again Until the Flywheel is Loose and Can be Removed from the Crankshaft.
**Note the Key that Aligns the Flywheel to the Crankshaft.**
>>This Key is Most Likely Sheared or Bent and Causing the Plug to Fire Slightly Out of Time and Causing a Compression Lock. There is Not Enough Compression to Kick Back But Enough to Cause the Engine to Seem to Have High Compression or it May Seem to have Low Compression and Not Backfire at All.
>>**Some of the Newer Units have the Flywheel Key as a Part of the Flywheel and the Complete Flywheel has to be Replaced.**
>>If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Happy.



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