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'01 Toro Zmaster...cuts off after running 20-30 minutes. will start right back up but will cut off again. After letting cool off I can mow again. changed spark plugs, cleaned air filter

Just changed oil & filter.

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  • Master
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Hi
When your leaf blower quits after it gets hot, you either have a problem with gas flow being restricted into the engine or with the spark. This is a common occurrence on older-model leafblowers. By replacing your spark plugs and keeping your gas lines clear you can reduce the chances of this problem recurring.
Possible Vapor Lock:
Vapor lock happens when excessive heat and vapors build up in the gas tank and aren't vented properly. Check for this problem the next time your saw dies when it's hot. Unscrew the gas cap, vent the gasses and try to restart your blower. If it starts you have vapor lock, and will need to carefully inspect the fuel tank's vent hole to see if it is plugged or damaged. Clean this hole with a brush and rag.

Possible Ignition Problems:
A common problem is an old or dirty spark plug. When the plug gets covered in black carbon the spark will have difficulty firing, especially when hot. You may also have a problem in the ignition module or the coil in the module. Again, run the blower until it quits and then squirt a little starter fluid into the open choke valve, underneath the air filter. If it starts up you likely have a fuel system problem, but if it doesn't start, your ignition module or coil is likely almost finished.
Fuel Supply:
At certain times when the engine gets hot, the flow of fuel to the carburetor can get restricted. This can occur with a dirty fuel filter on the end of your main hose. The hose itself, when hot, can also lose its proper seal to the carburetor, restricting the flow. Replace your fuel filter and hoses on a regular basis, usually once a season. Try adjusting your carburetor's screws to see if you can richen the fuel mixture in the carburetor.
Other Problems:
A dirty or worn-out carburetor can also cause similar problems when hot. You should get your carburetor cleaned and serviced. Try installing a carb kit to older carburetors to help with the flow of fuel. A fuel pump inside the carburetor can also start failing and any warping in the diaphragms will also cause similar problems. You can check for a dirty carburetor by squirting a shot of carb cleaner into the open choke hole just after starting the engine. If you see a lot of thick, dark smoke pouring out the muffler, your carburetor is dirty.
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Bud

Posted on Apr 25, 2013

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dontbother10
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SOURCE: Toro self-propelled, 6.5 electric starter, three

Did you rate this? We are having a problem with self rating by our experts. If you did not rate this or do not believe it warrants a rating of very helpful please rate it as NOT HELPFUL. Experts cannot override your rating and seems to be the only way to stop this practice.

Posted on Dec 06, 2009

  • 97 Answers

SOURCE: leaf blower problems

You may have a dirty fuel filter, or carb needs cleaned.

Posted on Mar 19, 2009

  • 1 Answer

SOURCE: My toro self propelled only runs for a few

Have you tried replacing the gas cap? I had the same problem with my mower and did everything you have done, changed gas cap no problem since

Posted on Jul 25, 2009

Grumman_1
  • 12 Answers

SOURCE: Toro 6.5 Tecumseh Recycler won't stay running

I have the same mower and problem. Found out the issue was the carburetor. Pull the Carb and do a quick cleaning. Order the replacement kit prior to working on. My bowl o-ring was shot and I couldn't get a seal after cleaning it out.

Posted on Jan 18, 2010

barterjoe
  • 338 Answers

SOURCE: We have Toro Lwa 100 Lawn Mower Model #26623.

This 1991-92 model is equipped with a blade brake clutch. When the blade slows down this means the belt is slipping. This slipping can be caused from a few different things.
1 --A loose cable. barterjoe_0.gif
Try adjusting the blade cable on the upper handle. this unit has an adjustable section. make sure the cable is not so tight that you snap it.
2 --A sticky pivot point under the belt cover
The belt cover in the back builds up with dirt and debris. Make sude it is clean under the cover and all of the pivots move freely. ( do this with the engine off)
3 --A sticky belt tensioner under the deck cover
The underside of this machine has a metal cover to protect the belts. Remove it and check that the blade belt idler arm is not frozen in place. this will cause the belt not to enguage all the way.
4 --A worn belt or belt pulley
The large flywheel and pulley can wear. Check this if the belt looks good.
This is all there is to the machine BBC system.
I hope this helps.

Get parts and more diagrams at a Master Toro Dealer like www.arcolawn.com
barterjoe_52.png

Posted on Mar 02, 2011

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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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