Question about Toro Lawn Mower With Toro Power Tools

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Engine surging Toro mod 20684, sn 6013033, # on crowe 17PF5202451. would not start. soaked carb overnight, replaced all gaskets from block to air filter, needle valve, fuel and air filter. Engine now starts but surges.

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Sounds like it is "hunting". it is a fuel mixture issue.

Posted on May 23, 2009

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Posted on Jan 02, 2017

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Try removing the needle from the carburetor and soaking it in brake fluid (and any other parts that may look suspicious) over night; clean and regap or replace spark plug; ...also, try using high test fuel.... this runs cleaner on my Toro826.

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Start with cleaning or replacing the air filter and fuel filter, if this help, then you have been lucky.
If not, then you must clean out the carb, it could be clogged, blocking air and fuel intake and fuel jet.
Also, if this is first run for quite some time, remember to change any fuel lying in the tank. It can be good practice to empty tank after use if it is going to lay idle for any length of time.

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1 Answer

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sound like the carb gasket is bad sucking air clean the carb out if continues replace the carb , but clean it out and the plug also

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I prime my tecumseh engine three times as stated. The lawn mower still will not start. How do I investigate to figure out what is wrong? I have taken it to a repair man twice. After I get it back it will...


This sounds like a fuel delivery problem. Maybe remove the carb and tear it down and then soak it overnight in a cleaner after removing all the moving parts...not real hard normally...then let dry and reassemble...If this doesn't improve the fuel delivery problem, maybe get another carb for it....Make sure the air filter is not plugged up, blocking air flow to the carb itself..just something to make sure of at first.

Jul 17, 2010 | Toro Lawn Mower With Toro Power Tools

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Won't start..checked everything changed spark plugs and gas


First, pull the air filter off and try. After pulling for a while while primed, pull the plug. It should be soaked with gas. If not, there is a carb issue, pull it off and clean it really well, checking the gaskets. If there is gas, plug the hole with your finger and pull it, the compression should push your finger off. If not, you either have a valve, ring, or head gasket problem.

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1 Answer

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There is dirt in the nozzel inside the carb,take it apart and clean it with torch tip cleaners. Remember to replace all the gaskets you disturb.

Nov 01, 2009 | Toro Lawn Mower With Toro Power Tools

1 Answer

Toro lawn mower. Have trouble starting(starts and


Remove the float bowl located under the carburetor it is a 1/2 bolt some gas will poor out so put a rag under the carb to soak up the gas, you actually may want to use a small container to collect the gas or make sure the gas tank is empty, remove the float bowl after removing the bolt by grasping it and turning, the bowl will most likely have debree and water in it clean with a rag and solvent and reinstall, becareful of the ruuber ring gasket when reinstalling the float bowl, one some movers there is no float bowl if you have this type of engine the tank and carb must be removed disassembled and clean out. Do not store mowers uncovered they must be covered when not in use, water gets into the fuel system and causes this problem.

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