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No spark from mower magneto - Garden

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Remove the recoil housing and unplug the small wire from the coil. If there is now spark, chech the kill switch or cable for stretching. If no spark, the coil is bad or installed up side down.

Posted on May 06, 2010

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Posted on Jan 02, 2017

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SOURCE: My walk behind mower wont start..has no spark with

Rust on the magneto has no bearing on the output of a spark. The magneto or the points if it has them could be the problem. If the unit has points they may be under the flywheel. If so equiped, that would be the logical place to start. If no points, I would replace the magneto. When you place the new one on, place a piece of paper between the flywheel and the magneto. When you tighten the magneto, pull out the paper and turn the flywheel by hand. If the magneto turns without touching, put everything together and try it out. Good luck...Lee

Posted on Sep 09, 2009

  • 13 Answers

SOURCE: my craftsman 7hp self propelled mower won't start,

The wire could be grounded or perhaps the distance point set of the magento coil is incorrect. Try cleaning the magnet part that the magento coil is set against, it could be dirty

Posted on Dec 15, 2010

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No spark. I pulled off the kill wire to eliminate that cause and still no spark. No visible damage. I pulled off the top metal on the engine to look at the magneto. It appears okay. But no spark.


Hi Dale, if you have isolated the kill wire at the magneto then the magneto is faulty and will have to be replaced. Regards Phil.

Jun 26, 2012 | Garden

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

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

No fire to the plug


that could be from a short in the circutry even as simple as some debri build up around the blade brake magneto ground contact point that is grounding the magneto so spark can not continue to the plug could also be a fouled spark plug or could also be the magneto condenser attached to the magneto has burnt thus looseing capability to disperse the electrical energy to the spark plug, and worse case senario is the magneto is internally damaged from use also possably the magneto's air gap to the magnets on the flywheel is to exssesive for energy production hope this helps Steve

Jul 30, 2010 | Troy Bilt 5.5hp Self Propelled Mower

1 Answer

My sears 13 1/2h.p. riding mower engine turns over, but there is no spark.


It is a magneto-generated spark. If all of the interlocks are in good shape, I suspect that you will have to replace the magneto module.

Oct 12, 2009 | Garden

1 Answer

My walk behind mower wont start..has no spark with new plug or old one could it be a rusty magneto


Rust on the magneto has no bearing on the output of a spark. The magneto or the points if it has them could be the problem. If the unit has points they may be under the flywheel. If so equiped, that would be the logical place to start. If no points, I would replace the magneto. When you place the new one on, place a piece of paper between the flywheel and the magneto. When you tighten the magneto, pull out the paper and turn the flywheel by hand. If the magneto turns without touching, put everything together and try it out. Good luck...Lee

Sep 09, 2009 | Garden

1 Answer

Lawn mower won't start gas is pourring into carb.&it has good spark.plus new plugs.help!


check magneto it might be rusted it sends the spark to the spark plug, if not that then it may be the points, mounted on the outside of the magneto

Sep 07, 2009 | Garden

1 Answer

Riding mower wont start


Hi Pry

The spark comes from the Magneto. Follow the spark plug wire and you will find the magneto at the end of it

The first thing you should check though, is the safety kill switch. There is a pressure switch in the seat that kills the engine in the event the driver falls off.

You need to be sitting on the mower to start it.

If the switch is ok and you still get no fire, it's the magneto.

Best regards,
Mike

Sep 07, 2009 | Garden

1 Answer

No spark I put new spark plug and gaped new


check the small wire coming out the magneto maybe it is grounding out somewhere, disconnect it from trhe magneto and then see if you have spark

May 16, 2009 | Cub Cadet Street Sign- tractor lawn riding...

1 Answer

Little spark


check the gap on your plug. .030 is what it should be. also make sure that your
kill cable is working properly and not grounding the engine out.
the gap for you magneto should be set to .010 to .012
loosen up the magneto insert a standard business card or 3x5 card
then turn the flywheel so that the magnet on the flywheel pulls the magneto into it. then tight the magneto mounting screws down. try spark now. always use fresh gas. -no-water- if in doubt throw it out.
gas is BAD after only 30 days.

Apr 26, 2009 | Mtd Yard - Man 160cc, 21" Self - Propelled...

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