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Garden Tractors Discussion Board

Briggs motor has me ready to shoot it!!!

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Posted by JDseller on August 16, 2012 at 18:56:53 from (

Posted on Tractor Talk also.

My Grand Daughter is going to college. She and three other girls rent a house. They bought a mid-priced push mower to mow their yard three years ago. She was mowing the yard a few weeks ago and it ran off speed wise. She shut it off before it blew up. She brought it home to me to fix. It would start but just as soon as it got going it would over speed. DID start hard but would start.
I tore into it and found that the plastic air vane/governor had broken. No problem. I ordered a new one. It came in yesterday. I installed it. I cleaned everything up under the flywheel. I then tried to start the mower. No start. I checked for spark. Light yellow. AHHH the problem. I put in a new spark plug and still poor spark. So I put a new coil on it. Now I have bright blue spark. Tried to start it. No go. Removed the carburetor an cleaned it and installed a new kit. No run!!!! I removed the flywheel to check the shear key. All was fine. I checked compression, right up to spec. I even adjusted the valves. I have brought it up on compression and checked to see if it is firing on TDC. It is. Check for intake leaks, all is tight. You can not even get it to hit one time on starting fluid or WD 40. I have had the carb off three times and it looks fine. Still no hit or fire.

The only thing I can find that I question is that the flywheel has the magnet on one side and a counter weight on the other. At least I think it is just a counter weight because it is not magnetized. I marked the one that is magnetized and it is at the coil at TDC. It seems to spark at TDC.

I am at my wits end on this thing. I came close to using the sledge hammer on it today!!! I gave the Grand Daughter my push mower to get her yard done with.

SO where do I go next??? I am out of ideas on this thing. I have asked the two local small engine guys and they could not think of anything I have not tried. So what do you guys think????


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