Question about Mtd 22" Yard Machine Push Mower

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Start and immediately stops

Like to know the gaps for spark plug and magnito
Thanks, Fred

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Spark plug gap would be .030 and magnito gap would be .010. I would clean carberaor. Sounds like the main jet is plugged. Hope this helps you.

Posted on May 09, 2010


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did you make sure the new spark plug was igniting if it is or if its weak you might have broke the flywheel key was it running fine when last used there can be alot of things it could be 2 cycle engines must have 120psi of compression ,the right fuel mixture,good plug right gap between flywheel & magnito (spark plug wire connect to to get spark) and not rust on flywheel & magnito hope this helps let me know thanks

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Spark plug gap is .025

As for the air gap in-between the flywheel, and magneto, I generally start with a piece of notebook paper in-between them.

After the bolts are snugged down, turn the flywheel by hand to spin the paper out.

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Doesnt get spark

check the magnito for rust build up.
try a different spark plug.
try adjusting the gap between the magnito and flywheel... use a peice of paper for a gap guage.

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Magneto coil adjustment is normally about 1 newspaper thickness for a guide. The spark plugs for these small engines usually are preset in about the right range, & I rarely gap then when I work on the small engines. Also check your carb to make sure its clean while you are at it. Rick

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Saw quits running after about 30 minutes

Sorry, I should of asked for the symptoms. IE was it doing this before? Would it start? Will it rev up to full speed? Check your air gap between the magnito (coil) and the flywheel. A cover of a note pad or a piece of cardboard from a pack of cigarettes will get you the correct air gap. Place it between the flywheel magnets and the magnito arms then tighten your magnito down into place. If this does not do it, it time for a new magnito. What is happening is thier is a hairline crack in the circuit board in the magnito and when it gets hot it seperatates the connection and no spark.

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I have a 6750W yamaha engine. I drained all of the gas out and replaced it. I am not getting any spark. What can I do? Dan

First how are you checking spark. Spark tester or spark plug against metal? With a spark tester your only testing spark to the spark plug. With the spark plug against metal you do not know is spark is getting to the plug. So it's best to do both and save you time and effort. A spark plug cost less then $3 so I usually replace them when I have a starting problem automatically.

The engine may have a low oil shutdown switch. Check the oil level. If this does not do it, there should be a single black wire coming form either underneith the fuel tank or out of the casing by the recoil that leads to other wires. This should be your grounding wire for the magnito. Disconnect this wire and try to start the unit. If it starts then one of your shutdowns or switches is bad. Reconnect it while it's running to shut it down or push it's connector against the engine block to ground it out. Now if it ran you need to disconnect all wires that connect to this wire and hook them up one by one until you find one that shuts down the engine. When you find it follow it to it's source and that is you problem. If you don't get anything the next step is to remove engine shroud by the recoil (some engines require you to remove the recoil to do this). Now you should be looking a the flywheel and magnito (coil). Did connect the small wire on the magnito and tuck it out of the way so it does not get caught in the flywheel when running. Reinstall everything and try starting again. If still nothing you need to change your magnito. To set the gap on your new magnito a piece of a cigerette box or equivalant between the flywheel's magnetic portion and the magnito should give you the proper gap.

Note: all wires on a small engine are to ground out the spark except a few others on generator which provide power to generator field.

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