Question about Toro Lawn Mower With Toro Power Tools

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My lawnmower will not start. If primed many times, it will burn the gas that is primed, then stop. New plug, air filter, gas, and oil.

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You need to remove and clean out the carburettor and depending on the type of carb, renew the diaphragm if there is one in it. Stephen.

Posted on May 06, 2010

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Why won't it fire up?


lawn mower trouble shooting, no start
First check the air filter. Is it getting air and gas? If not lets find out why.
1. Air Filters; There are 2 types. One is made of paper and the other is made of foam. NOTE: (Whenever you lift your lawnmower for any reason disconnect your spark plug and ground it.) NOTE: Do not run your engine or any engine without the air filter, it will RUIN the motor. When lifting your lawnmower on its side, always lift it with the carburetor up. A little oil Will come out, but not enough to hurt anything. If you lift your lawnmower with the carburetor down oil & gas will go everywhere. If your air filter is made of paper the oil & gas will ruin it. If not you will have to clean your foam one.
a. Paper filters cannot be cleaned with gas or any solvent, you can only use compressed air to blow the dirt out. If it's very dirty, it's best to replace.
b. Foam filters can be cleaned with dish washing liquid and water and dried with a rag. Then very liberally, work new engine oil throughout the air filter and squeeze out excess. The oil in the filter is what traps the dirt. If your foam filter is deteriorating or coming apart replace it, it can ruin your engine. Clean every 25 hours under normal conditions. Note: Use the same type of engine oil you use in your small engine to lightly oil your filter.2. Check your gas cap. The gas cap is a source of ventilation for the fuel tank. If your gas cap is clogged it will make your fuel tank vapor lock, and you will have no gas flow. To check and see if the gas cap is bad, loosen the gas cap and see if it will run longer than before you loosened the gas cap. If it continues running, you need to replace the cap, if it does not continue running check further in this troubleshooting guide for more information.
3. Is the fuel line clogged or partially clogged? Example: when you disconnect the fuel line from the carburetor and the gas is steadily flowing there is not a problem. But if it only drips with a full tank of gas replace it after checking the gas cap.
4. Do you have a fuel cut off? If so, is it cut on?
5. Do you have a gas filter? If so is it clear? If not, replace it.
6. Is the gas flowing in to the carburetor? If not you could have a piece of trash in the needle & seat. The needle & seat controls the gas flow that starts & stops the gas. You will have to clean or replace. It's best to replace.
7. The float controls the gas level in the carburetor. If any of these signs occur, the carburetor is overflowing out of your air filter or out of your primer. If you have gas in your oil, you have carburetor problems. NOTE: Drain the oil if there is gas in it, if you don't it can be dangerous. You need to check the needle & seat to see if it has trash or is bad. Is your float bad? To check the float pull the pin that holds your float in place, shake the float and if there is fluid inside of the float, replace it. Don't forget to set the float level.
8. Carburetors with primers represent a large majority of lawnmower and small engines today. They have primers to push or force air in the carburetor and in turn force gas through the center jet to make starting easier. Then look to see if the primer is pumping gas in to the engine.

9. Things to check for if the primer is not working. This applies to several different types of engines. Check for holes or tears if you have a carburetor that has a diaphragm. (A diaphragm is a gas pump located in carburetors that have the gas tank and carburetors assembled together.) Replace the diaphragm if the diaphragm has a hole or has hardened or slightly slid over to one side, or if the engine will not run correctly and is skipping, not priming, or will not run at all. If you have a float type carburetor, the bowl gasket Will not be sealed properly and air will leak past the bowl gasket and will not prime. If you have a air assembly primer box where the air filter box is connected to carburetor, your gasket Will not be sealing correctly. If there is a tear or a hole in the gasket, air will leak past it and will not force air in the carburetor which will not force gas through the center jet. Also your air assembly box Will have a crack and will be warped because it was over tightened. If so, replace it.
10. Some models have chokes. Chokes are used to draw gas through the center jet to run. If the choke is not working properly and it is not closing all the way the engine cannot draw gas through the center jet and will not crank.

11. The throttle cable is what operates the choke on some models and the primer on some others, but it works the speed of the engine. To adjust the throttle that works the choke you need to loosen the throttle and open the throttle all the way, then push it until the choke is closed all the way. To adjust a "speed only" open the throttle all the way and make sure that the engine speed will be all the way open and then tighten the cable back up on the engine. Make sure if you have a kill switch on the throttle cable, that it works when you lower the speed all the way. If not, adjust again. Carburetors: Carburetors are the cause of 99% of all small engine problems. Carburetors are the easiest thing to repair on small engines.

We have videos to that will help you in the repair of your Lawn Mower and Small Engine

Section 2 Troubleshooting safety switch system
1. Spark. There are several things that would keep a lawnmower or small engine from sparking like the safety switches. Lawnmowers and small engines have several different locations where the safety switches Will be. If your lawnmower or small engine doesn't spark you need to get your owner's manual and find out where your safety switches are and then try to trace the problem.
2. Oil sensor. If you have one ... The oil sensor will make your lawnmower or small engine quit running until you fill it with oil to the "full level." This will cause the engine not to spark because of the oil being low. NOTE: This is a safety feature to protect your engine from running out of oil.
3. Stop cable or blade brake. This cable is connected to the handle bar and you have to hold the handle bar down for your engine to run. This cable becomes stretched after some time and needs to be replaced. There is a safety switch on the other end of that cable, on the motor, that Will not be opening all the way and in turn, not letting the engine spark.
4. Coils. Lawnmowers and small engines have changed a lot in the last 15 years. 99% of all lawnmowers and small engines today have electronic ignition coils which means no points. When you start your lawnmower or small engine and it runs until it gets hot and won't start back again until it cools off you Will have a bad coil.

Lawn Mower Repair Troubleshooting Lawn Mower

Jan 16, 2016 | Garden

1 Answer

My lawnmower is fuming when i start it. what is causing it?


Is the air filter clean? Dirty air filter creates a vacuum sucking too much gas.
Is the choke not working properly?
It it's black smoke it's burning too much gas.
If it's blue smoke it's oil. If it's oil smoke did you over fill when you put oil in.
Over filling the oil will cause it to smoke.
Bad piston rings will cause the oil to burn also.

Oct 09, 2014 | Garden

1 Answer

21" Troy Built Self Propelled lawnmower engine won't start.


Remove spark plug, clean or replace. Remove air cleaner, clean or replace. Ensure oil is full. 30w. Drain old gas out of tank. Fill with fresh gas with Stabile added. Remove bowl from bottom of carb. clean. Observe bowl screw, see if hole goes thru screw. Clean out. Bread wrapper works nice. Observe float. Float down gas flow, float up no gas flow. Re-assemble, prime 3 times, pull rope 10 times to start. No start replace carb.

Jul 30, 2013 | Garden

1 Answer

I have a new 650 sears craftsman self propelled 22" lawnmower that will not start. I have gone through the prime bulb instructions, still no luck.\r\nAny ideas? Walter in Alberta Canada.


could be the priming bulb gasket between the air-filter assy. and the carb.
I have the same lawnmower and if I prime with gas from a can it will start but stop after a few seconds. When I push the bulb I can hear air leaking in this area. You can replace the gasket by removing the back half of the air-filter assembly. I am looking to buy a gasket today I let you know how it works out! Thanks Ron

Oct 24, 2010 | Craftsman 675 Series 190cc 22" Briggs ...

1 Answer

I have to prime the toro mower every time I empty the bag to get it to start?


  1. what is the model, manufacturer and year of mower?
  2. has any maintenance been performed on this mower?
  3. if no, try replacing the spark plug and air filter (it's possible the spark plug could be fouled and/or the air filter is clogged) be sure to follow the manufacturers recommendations for oil, gas, filters and plugs.
routine maintenance involves:
  1. sharpen/replace blade
  2. oil change
  3. replace air filter
  4. replace spark plug
  5. new gas

Aug 31, 2009 | Toro Lawn Mower With Toro Power Tools

2 Answers

Lawnmower is spewing white smoke


white smoke means that there is water in the fuel air mixture during combustion. a bluish white smoke means oil is being burned during combustion. take another look and make sure which one it is. since all mowers ive seen are air cooled the only way water can be getting in the fuel air mixture is through the gas cap. check your gas tank and gas can for water. may be best to empty both and start over with fresh fuel

Jun 09, 2009 | Craftsman 20 hp 42 in. Deck Yard Tractor

2 Answers

Lawnmower wont start


Possible Causes Corrective actions
Unit will not start Control handle is not engaged Engage control handle spacer.gif spacer.gif
Spark plug wire is disconnected Connect spark plug wire spacer.gif spacer.gif
Fuel tank empty or stale fuel Replace with clean, fresh gas spacer.gif spacer.gif
Blocked fuel line Clean fuel line spacer.gif spacer.gif
Faulty spark plug Replace, clean, or adjust gap spacer.gif spacer.gif
Engine flooded Wait to restart, do not prime spacer.gif spacer.gif
Air filter filled with dirt or debris Replace or clean air filter

May 23, 2009 | Mtd 22" Yard Machine Push Mower

2 Answers

Craftsman lawnmower 6.75 horse Eager-1 21''rear drive


Buy a can of engine starter (ether). Prime engine, spray a little ether into the carburator (air filter) and pull start.Works great.

Mar 23, 2008 | Video Game Consoles & Games

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