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How to change a magneto on a riding lawn mower

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Remove the end cover (where a rope starter is or would be). Remove the magneto attachment nut. Acquire a magneto puller. Attach it to the magneto, crank it until the magneto pops off. Find the little rectangular key (which might have popped off the shaft when the magneto popped off), and make sure it's seated in its little groove in the shaft. Place the new magneto on the shaft, install its attachment nut, crank it down.

Posted on Jun 07, 2014

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Posted on Jan 02, 2017

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SOURCE: Craftsman 21'' Lawn mower won't start

In order for there to be a spark at the plug, make sure the plug is grounded to the engine, it will not "fire" if it isn't.

Remove the cover with the crankrope, there should be a thin black wire going to the coil, going to a ground lug that kills the engine. Try unplugging this wire and re-check the fire...if it fires, there is a fault in this wire and should be replaced. The mower will run without it, but will not stop without "choking" out the engine

Posted on Apr 16, 2009

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SOURCE: riding lawnmower starts but will not continue stay running?

its probably in your ingnition switch, grab the switch and turn it right the turn key I had the same problem and that fixed it. It also wasnt starting and it was the same problem the switch is lose.

Posted on May 31, 2009

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SOURCE: Lawn mower will not stay cranked unless you keep pouring gas into

common problems to all older lawnmower, lots of dirt and dust the mower goes through and ages. I would first start by taking the carb apart and clean the filter with soap and water, allow it to air dry. also carburetor prob need rebuilding or replacing. Pick up some Carburetor cleaner at any auto part store and spay it down the carb, dont be afraid to spray allot in there and let it dry for 1/2 and hours. carb tend wear and parts need replacing just like any engines. 99% of the time lawn mower carb goes out before the engine will and common problems with all lawn mower. If you not mechanical incline or dont want to rebuilt it, just buy the whole new carb and replace it, fairly cheap easy to replace and will last you another 10 + years or more. www.briggsandstratton.com

Posted on Sep 01, 2009

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SOURCE: blade belt diagram for John Deere LX178 Riding

Remember the belt rule, V of the belt goes in V pulleys.Flat pulleys that are stationary or move get the back of the belt. You can figure it out. Its not rocket science. Remember at some point there has to be a tensioner,usually gets the back of the belt if its a flat pulley. U may have to remove the spring and then reattach the spring after the belt is routed.

Posted on Oct 29, 2009

rycgl
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SOURCE: I have a Toro Super Recycler Mdl 20033 ser

You may not need to change the ignition module. The "air-gap" on it may just need to be adjusted. That is, the distance between the pickup legs of the ignition module and the magnets integrated into the flywheel. You would have to remove the exterior cover and any sheet metal cowling (directs air flow off the flywheel around the engines cylinder). Then, the coil and flywheel should be visible. I use a standard business card as a gauge. Slide it between the coil legs and the magnet area of the flywheel. You should feel just a slight little rub. If it won't slide or the gap is large, no spark will be produced. You will have to loosen the screws holding the coil in place, double up the card. let the magnets pull the legs in against the card with magnets behind and retighten. Then recheck for spark. Post back if needed.

Posted on Apr 04, 2011

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1 Answer

What supplies voltage to spark plugs?


The spark on the 25 hp Kohler is Magneto. There is likely an interlock to the PTO and Seat safety interlock. The magneto appears in some lawn garden applications to be connected via the safety interlock?

So when the engine turns the magnetic field of the flywheel activated the engine spark but if the interlock safety switches are not enabled the spark the magneto is disabled resulting in no spark. A lost spark is likely a defective or corroded switch.

I hope this helps?

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just because it wont start doesn't mean your MAGNETO is shot. There could be a short in the ground wire. A damaged high tension lead. Do the tests and figure it out. A magneto can be costly .

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Little more information please. What kind of mower, engine and engine numbers please and I will be more than happy to help you.

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My little 25'' Toro riding mower has no spark


did you put a little gas on the plug before you put it back on and make sure the spark plug is gagged correctly. And with the plug out and connected to the wire holding it with a tool you should be able to see sparks. If not it could be a faulty wire.

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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

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