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Will not start I have replaced the battery, spark plug, fuel filter, air filter, magneto, removed the flywheel and cleaned out all the dirt and dust, sanded around the outside of the flywheel and installed a new keyway, replaced starter bendix and it still will not start. It acks like a car with the timeing to far advanced. Some times if I turn the engine backwards by hand it will spin but not always.

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If it is cranking with no fire, try squirting some fuel into the cylinder, if nothing, check the spark again, with the plug lying on metal hooked to its wire, crank it over and see if you have spark, if not then go back to the magneto, the coil may be shot. You only have so many choices before you hit it. Like air, fuel, fire, I would rule out the air, take that right off, and shove some gas into the carb. Keep trying. Hope this helps.

Posted on May 02, 2010


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Model 917.275670 wil turn over but not start

There could be several problems. (1) Is it getting fuel to the carburetor? If not check fuel filter. (2) There is also,a fuel solenoid that controls fuel going to the carburetor,when the ignition switch is off the the solenoid closes a valve,stopping fuel to the carb. When the ignition switch is on the solenoid opens the valve,allowing fuel to the carb. You will know it is functioning,when you hear a small click,when you turn on the ignition switch. If you don't,then this solenoid is bad. (3) Is the spark plug fouled up with carbon deposits,if it is,clean with a wire brush. Replace plug wire,turn on ignition switch,rotate motor until you see a spark,if you see a spark,is it weak looking? If so,replace plug with a new plug. Any time you remove a spark plug,check the spark plug gap, should be .030" for a Briggs& Stratton motor. Use your Owners's Manual,for the correct gap,for your motor. Now,if you haven't,seen a spark at the plug it could be a bad plug wire. Replace the plug wire and run your test again,if you still not see a spark,then the magneto,it self is bad,these seldom go bad. More likely the fly wheel and the magneto has corroded (rust) on both parts. This breaks the magnetic field,thus no current to the spark plug. Take a look at the small electrical wires attached to the magneto,are they broken or corroded at the connectors. These wires lead to the ignition system. If corroded,clean the ends or if the wires are broken splice wire or replace the magneto. You should,take a good visual look,at the carburetor,is it dirty? Is the air filter(s) dirty? It they are dirty,clean by using compressed air or wash and let dry. Remember this,the motor has to have three items to start and run.(1) Air (air filter),(2) Fuel (carburetor& fuel filter) (3) Igniter (Spark Plug). These have to be cleaned or replaced often,these are the most problem(s) of a "No Start" situation. I hope this helps. Sincerely,Brad Locke DTD 12/04/15

Apr 10, 2013 | Sears Garden

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I am getting no spark at plug. Briggs model 31c707 motor. I have charged battery, adjusted valves, verified fuel line clear. Pull spark plug put into wire hold to motor and crank (no spark)

Hello, the next couple of things to check would be under the engine lid.

  1. Remove the screen over the air fan on the top of the fly wheel.
  2. Remove the 4 bolts securing the main lid and remove. Depending on the year of this engine it may have a secondary cover that Craftsman put on that will need to be removed first.
  3. When the lid is off you will see the magneto coil right above the spark plug; just follow the spark plug wire up to it.
  4. Use a wrench to see if the magnet on the fly wheel is strong. If the magnet is bad or really weak the flywheel will need to be replaced.
  5. Next check the magneto ground out wire. It will be a small black wire on the magneto. Unplug it then crank the engine. If the engine starts plug the wire back on the magneto and if it shuts down there is a short along the wire. It should only shut down or short out when the key is shut off. You will need to find the short if this is the problem.
  6. If the magnet is strong and the above test still fails to provide a spark then it is likely that the magneto is bad. You will need the rest of the model number; it will look something like: 31c707- # # # # - # # The part runs somewhere around $35.00 from Sears, but you might find it on-line cheaper.
  7. Replacing the magneto is pretty straight forward from there.
  8. Remove the old one and replace the old one adjusting it as far away from the flywheel as possible.
  9. Turn the flywheel until the magnet is directly across from the magneto.
  10. Put an ordinary business card between the magneto & the flywheel.
  11. Loosen the 2 screws that hold the magneto in place just enough for it to tighten up to hold the business card in place.
  12. Tighten the screws holding the magneto & rotate the flywheel to remove the business card.
  13. Test rotate the flywheel by hand a couple of full turns to ensure there is no contact with the magneto.
  14. Replace the small black wire, spark plug and spark plug wire, then test fire the engine.
  15. Shut the engine down and replace all the remaining parts in the reverse order as removed.
You should be good to go after this. If this was helpful please vote yes. Thank You!!

May 06, 2011 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

2 Answers

Craftsman 17hp 42" cut riding

Sounds like its not getting enough fuel. clean the fuel system and the carby. The valve clearances also need to be checked.

Apr 07, 2011 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

2 Answers

Will not start.

Check the chainsaws compression by putting your hand over the exhaust while slowly pulling on the string you should feel small bursts of air and feel resistance on the chain if not the cylinder most likely has lost compression and needs new piston rings.
Also, check that the spark plug is firing either with a spark plug tool (sold at many hardware stores or places like harbor freight). Or check it by removing it, connect it to the plug wire and touching the tip of the plug to a ground (the Finns on the cylinder or anything metal on the saw). Make sure you see a spark in between the two electrodes on the plug (do so in a dimly lit area as it can be hard to see). If there is no spark check the flywheel and magneto for any dirt or other material and clean it with a wire brush if there is no spark after cleaning the magneto, plug, and setting the plug you will need a new magneto.. Also make sure to check for dirt and carbon build up on the plug and use a gap tool and make sure the plug is set to the specs. on the manual (gap tool can be found at any hardware store) If you have cleaned the plug, properly set the gap, tested the spark, and have compression the problem is most likely a fuel delivery or fuel air mixture problem.
Make sure that the air filter is clean and free of any fuel/oil, moister, and dirt a dirty filter will foul operation.
Check the fuel tank for build up along with the fuel line and filter/strainer in the the tank if there is one. If you find alt of gum or particulates in the tank or line/filter clean them out with carburetter cleaner. You can also use starter fluid (sold at any hardware store) to clean the tank and lines and use it along with a clean tank/lines/carburetor. check the carburetor for build up by removing the bottom screw on it to inspect the bowl and carb float for residue. If you find thatr the carb bowl and float has particulates and other build up clean it with carb cleaner.
Also check the idle and running screws on the carb for proper adjustment the user manual will have the information to do so.

Jan 24, 2011 | McCulloch Garden

1 Answer

Have a 5600 Gen. with 10 HP B/S engine OHV. Did great during Rita, replaced carb- changed gas-replaced plug- doesn't want to fire it seems. Where Can I find the magneto ? Are there points on the flywheel...

The magneto is by the flywheel. Depending on the age, there maybe points under the flywheel. If so you remove the flywheel and there the points are. Sometimes bugs build cacoons between points, make them inoperable. Newer engines have electronic ignition though. Follow the small wire from the magneto coil ( where the spark plug wire goes) it will either go under the flywheel through a plastic bushing, or to an electronic module. The magneto coils do fail you can test with an ohm meter. Before that test for spark. You can remove the spark plug, and let it rest on the engine to get ground, and turn the engine over. You always need 1-spark, 2 fuel . If you have spark, see if it will hit on starting fluid, if it does, then you have a carb or fuel filter issue. Those shut off valves on the bottom of those tanks, can be a problem

Jun 29, 2010 | Briggs Stratton H7159 & Stratton® 5500,...

1 Answer

Engine will not fire {no spark }

Did you sand the rust off of the flywheel? where the magneto is. And did you set it right? It has to be real close to the flywheel. The thickness of two pieces of paper. And yes the pto switch will keep it from starting. If it is ingaged it wont start. Can you hear it enganging when you connect the battery? Try turning switch on and off see if it will kick in and out. With key on

May 10, 2010 | Yard Machines 155 Torque Briggs Stratton...

2 Answers

1977 yz80 wont start. Cleaned carburetor, checked magneto, but cant get to start having problems getting spark, replaced plug.

If you have a spark, but weak. It is possible that your flywheel is demagnetised. Then you'll need a spare.
If sparks are good, then the spark plug should be moisted with fuel after a few ( 10 ) choke kickstarts. If so you'll have a weak compression. Then you have to at least clean out the piston ring grooves ( dismount cilinderhead and cilinder ), or even change the piston rings or overbore the cilinder and place a new oversize piston kit.
If spark plug stays dry when kickstarting, the carburettor is faulty. Clean it out, check also the choke system. Check the air intake between carb and cilinder for air leaks.

Oct 04, 2009 | Yamaha YZ 125 Motorcycles

1 Answer

My riding lawn mower won't start. New battery (cables & connections are clean), new filter, plug, rebuilt carb. It's getting spark but won't start? I cleaned the magneto and flywheel. Any other ideas?

Spray starting fluid into the air box if it starts and dies out there is a fuel delivery problem if the mower has a petcock fuel shut of valve disconnect the fuel line after the petcock and hold a container under the hose turn on the valve to ensure gas flow to carb if there is no petcock valve I would still check the line to carb make sure gas flows through the hose to carb.

Jul 23, 2009 | Champion International Champion& Small...

1 Answer


Not so many reasons she won't start. 4-Strokes are Simple!

Here they are:

Fuel Tank-> Fuel Line-> Fuel Filter-> Carb-> Intake (Valve)-> Piston-> Exhaust (Valve)-> Muffler

Carb (Old Style):
Fuel Side:
Fuel Bowl-> Float-> Needle Seat-> Fuel Ports (Venturi)
Air Side:
Air Filter-> Carb Air Intake-> Butterflies (2)
(Clean 'em ALL!)

Hardware (Motor):
Rotor (Magnets)-> Magneto (Ignition Coil)-> Spark Plug Wire-> Spark Plug-> Cylinder Head (Spark Plug Ground)

Kill Switches (Seat, Clutch, etc.)-> Spark Plug/Ignition Coil-> Ground
Key Ignition-> Battery->Starter/Generator

If one of those fail.......= Non-Starting 4-Stroke!

You are either getting too much, or too little. Too much = Carb.
Too little = Carb. Therefore, tear down the Carb (COMPLETELY-Careful!) and clean it up.

Grounding out the System (Kill Switches)
Battery-> Ignition-> Starter.
Magneto->Plug Wire->Plug (Check 'em all!)

May 28, 2009 | Mtd Garden

2 Answers

Starts runs min. or two then stops....

Go to then click customer care, then click manuals and parts. Type in model no. and download the owners manual. This should get you the spark and flywheel gap. Probably still something in the carb. Some orifices are very hard to find and to clean but they must be clean. Also check for dirt dopper nest in the muffler.

Apr 05, 2009 | Toro Lawn Mower With Toro Power Tools

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