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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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Your lawn mower is not meant to be run on fuel that contains ethanol. To fix your problem you have to remove the carburator and take it apart,get some carburetor cleaner the one with the plastic tube for spraying with pressure work over a small bowl or container spray the carburator through all of its ports and openings clean the carburetor till there is no build up ( build up usually apperars as discoloration on the metal then pour some carb cleaner into the container and let it soak. after soaking over night put the carburetor back together and reinstall with new gaskets as the ones that go to the block are usually hard and will tear just enought to let air in after putting together add a fuel additive to your gas they sell it at any Home and Garden store this will keep the ethanol from turning to gum again. When putting the lawn mower up for the season drain the fuel system or add extra additive to the fuel and prime it through the carb. This will solve your problems ,just make sure that you keep track of the way the diaghrams come out of the carb and put them back in the same order

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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

1 Answer

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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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Engine starts right up after pushing primer bulb,

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

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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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Toro 6.5 hp 9 year old mower. Starts Ok; surges

Sounds like your carburetor needs to be cleaned out. The surging is usually a sign of running to lean (not getting enough gas) because of possible water, rust, gum, varnish or trash in your carb. Hope that helps.....

May 17, 2009 | Toro Lawn Mower With Toro Power Tools

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