Question about Toro Lawn Mower With Toro Power Tools

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No torque/hp when cutting a patch of grass.

My problem started when my 6.5hp Tecumseh engine would die after running for about 7-10 seconds. I removed the carburetor, and cleaned it with brake-cleaner and compressed air. After I placed the carburetor back unto the engine, some improvement was immediately noticed. The engine would no longer stall, and continue running but the rpm's was very low. I turned a set-strew that is located on the carburetor clock-wise, until I reached a desired rpm, and everything had appeared to be OK. But, when I went to use the mower, and would hit a patch of grass, the mower wanted to stall, and acted as if it don't much torque/hp. The engine seeems weak when put to the task, and acted like a 2.5hp or 3hp engine. I called a couple of Toro repair shops here in the area, and had one of the repair shops to suggest that I had/have contaminated fuel, or bad piston rings, but the engine doesn't smoke...just a little when I first start the engine. I had the other repair shop to suggest that the problem could be with the governor; that theory I'm more inclined to agree with. Do you have any suggestions, as to what my problem may be???

JK Lewis
Orlando, Fla.

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SOUND LIKE THE NEEDLE OR FLOAT IS BAD IN THE CARB. I SUGGEST GETTING CARB REBUILD IT DOES COST THAt MUCH.

Posted on Jul 17, 2009

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I was having the exact same problem with my 6.5 hp Toro lawnmower with a Tecumseh engine. The engine would start up okay but after a few minutes of mowing, the mower would start missing and eventually shut down. I would pull and pull and pull on the starter rope, getting angry and frustrated and eventually going back in the house to let it cool down.

I looked up all kinds of information and I finally decided it was a bad coil (something about the resistance being low when the mower wasn't hot and then when it heated up the coil would conduct enough electricity to somehow make the engine shut down.)

I called a local shop and wanted to get an estimate on replacing the coil. I have no clue about engines so I dared not get into the guts of the mower myself. He told me to check the gas cap. HUH??????

He told me to make sure there wasn't a part missing out of it. I thought, what the heck would a gas cap have to do with the engine shutting down. Well, apparently there is a mechanism on these caps that prevents a vacuum from pulling on the fuel system and my gas cap indeed had a part missing. To verify this, I cut the grass for about 5 minutes. When it started to run rough, I took the gas cap off to allow pressure to escape from the gas tank and voila! it started to purr like a kitten.

So, I'm only out $4 for a new gas cap and I'm as good as new. Man I wish I was more mechanically inclined so I hope your problem is as easy to solve as this one.

Hope this helps!

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