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I have a cs 4000 ser 00135 series that I am unable to get a spark... I replaced the coil, magneto, plug, flywheel is good... is there a ground somewhere that I am missing?

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The ignition switch or it's wire to the magneto might be worth looking at. Remove the switch connection from the magneto to see if you can get spark. The switch grounds the magneto circuit when it is set to 'off'. Good luck!

Posted on Sep 12, 2010

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Stihl fs 80 trimmer, replaced carb, air filter, spark plug, ignition coil. still doesn't start. Next? not getting spark from plug


Loosen coil screws, adjust coil to magneto flywheel magnets with a double sheet of common paper, tighten screws, so that paper will pull out without tearing. That will give you the best chance for a good spark, with all you have done. Pull spark plug out , put top of plug back in spark boot.......crank ovr with rope, and ground spark plug on top of motor(metal), observe the blue spark. If none, check the short wires for any breaks from coil to switch. You can open handle and take out switch, if nothing else works.....then try and start. The wires are just to break the ground, to turn off motor. Can choke motor to stop.

Jul 29, 2016 | Stihl Garden

1 Answer

No spark on Tora 724 snowblower, mod. 38050 Ser. 1004915, new pts set at 0.020, emptied old gas, add new gas, condenser, plug, new coil. is there a grounding problem that I missed? Air gap setting behine...


Ground is only for shutting of engine if it not hooked up wont turn off. Take flywheel off and look at magnet. Make sure it has not moved meaning they are glued in place and wont fall off. Give it a wiggle and see if it slides. If it does pull magnet off and re-glue in place. You will see mark on inside where it was originally.

Feb 19, 2015 | Toro Power Max 726 OE Snowblower - 37771

1 Answer

No spark


Did you try grounding the plug against a clean metal surface of the saw and pull the starter rope. If you do not see a spark I would suspect the ignition coil.or magneto that the flywheel rotates around to create an elelectrical charge. Sometimes eith the magnet on the flywhell or coil can get rusty. Try cleaning them up with some light sandpaper. Just make sure you replace the coil with the proper gap between it and the flywheel. When testing for spark as described above make sure you are not touching any metal surface on the saw or you could get a shock.

Aug 14, 2012 | Homelite Garden

1 Answer

875 Series Engine-cleaned flywheel and magnets and magneto. Put back together and now no spark to spark plug. What is the air gap between the magneto and flywheel.


You should put it at .020

Are you sure you had spark before you took it apart? If you are not sure, then the Ignition Coil may have went bad. How did it act before you decided to take it apart?

Jim

Aug 17, 2011 | Briggs & Stratton 190cc 875 Series OHV...

1 Answer

Oegn.comThe 675 has become increasingly difficult to start, till today when it appears to be getting no spark (I don't see a spark, but it does shock me when i hold on to spark plug and pull cork). Is...


The magneto is self contained and the primary winding is grounded via the throttle stop, flywheel brake, or the low oil level sensor to ground the magneto enough to stop the spark from jumping the spark plug gap.
First check the oil level and make sure it is fully serviced.
Second check the Flywheel brake switch to see of the cable needs re-adjusted or replaced. There is a lever on the brake actuator that makes a ground on the primary of the magneto. ANY gound on the wire that goes from the flywheel brake, the throttle control (if so equipped) or the low oil level sensor will stop the engine from having spark. There is no condensor. The magneto is excited by the magnet in the armature each rotation of the fly wheel. Grounding of the magneto primary rreduces / stops the function of the magneto high voltage output.

You need to find out what is grounding the magneto primary when the engine should be in a running state.

Thanks for choosing FixYa,
Kelly

Jul 17, 2011 | Craftsman 675 Series 190cc 22" Briggs ...

1 Answer

I have a brigs & stratton classic 35 engine 9d902-2022 e1 00032451 will not start it has a very weak spark could you please advise and could you also give me the gap measurement between the magneto and...


Hi John and welcome to FixYa, I am Kelly.
The gap between the flywheel and the coil is 0.0125. The easy way to set it is to get a pack of book matches tear out the matches and use the cover between the magnet and the coil then loosen the coil mounting screws allowing the magnet to pull the coil onto the match book cover. (This has worked flawlessly for 40 + years on literally hundreds upon hundreds of engines regardless of brand.)

Weak spark is caused by either a parasitic load on the kill wire or a bad magneto

Your parts list is here:
http://www.briggsandstratton.com/document/index.aspx?doc=MS4864_B_LO.pdf

If the control wire item 270 of the below link is fine / not grounding or chaffed. This little wire is notorious for grounding at the flywheel brake engine stop terminal and under the flywheel before the magneto.

http://www.partstree.com/parts/?lc=briggs_and_stratton&mn=09D902-2022-E1&dn=48640005A
then the most likely failure is a weak Magneto (Item 333 above)

Also make sure to check the high tension lead where it comes out of the air-shroud.

Lastly... use a phillips screwdriver in the spark plug cap making a small gap to the engine for checking spark. A bad spark plug can act like a resistor and show weak spark. HOLD THE HANDLE only on the screwdriver.

May 30, 2011 | Briggs & Stratton Garden

1 Answer

What would cause no spark? the mower is a masport 8/02 two stroke. Will not start and I have changed spark plug and cleaned every thing but still nothing.


Your spark plug wire may be damaged, or your magneto may be too weak to generate a spark. You also have a kill switch wired to your magneto, and a condensor. I would start by cleaning the contacts of the magneto and then check the gap between the magneto and the flywheel. The gap between the flywheel and magneto should be .010". I would start by checking the kill switch wire for damage. If any damage is suspected, replace the kill switch. Next, I would have the magneto tested or replaced. Also, check all your ground wires for damage, or loose contacts.

When you are checking for a spark, you should have the spark plug installed in the spark plug wire as normal, but not installed in the engine. The spark plug base should be grounded to the engine while trying to start and checking for a spark. If there is a weak spark, this is probably due to a worn magneto.

May 24, 2011 | Briggs & Stratton Garden

1 Answer

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...

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

No spark.I replaced the magneto and cleaned the flywheel.


check your coil with a test light see if ti is firing

Jun 10, 2009 | Garden

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