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post #1 of 4 Old 09-08-2019, 09:04 PM Thread Starter
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GravelyL1 tractor walk behind

Looking for help I gave a gravely walk behind. Shut down after 30 min of running wait 10 min start back up. Replaced point condenser plug wire spark plug. Noticed inside of muffler get cherry red any ideals on what wrong.
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post #2 of 4 Old 09-08-2019, 11:13 PM
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Re: GravelyL1 tractor walk behind

Dont think I can kno.
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post #3 of 4 Old 09-09-2019, 06:18 AM
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Re: GravelyL1 tractor walk behind

Hi Neal.

I'm trying to figure out what issue you're contending with. Is the problem that after running and shutdown, you can't get it running again for 10 minutes? Or is your concern when running, the muffler gets really hot?

Others on here have talked about the mufflers getting hot. I'm not sure there's a single cause. I'd say make sure your timing is right, valves are set correctly, and check the mixture.

If you're having other ignition problems, please say more about what the problem is.

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post #4 of 4 Old 09-09-2019, 04:06 PM
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Re: GravelyL1 tractor walk behind

I do believe you have a magneto timing problem.

Hopefully, you have a Wico magneto and can hear the impulse arm 'snap' while hand cranking. And hopefully no previous owner has messed with the lag-angle setting on your magneto.

Remove the spark plug and reconnect the plug wire, ground the metal part of the spark plug, or just ground the plug wire while making the following adjustment.

If the nut on the magneto adjusting block is visible, you are on the compression stroke, nut down is the exhaust stroke. The magneto turns at one half engine speed, spark every second time the piston comes up.

Now you need to find the high point of piston travel on compression, TDC. Place a long thin wooden dowel down in the spark plug hole and follow the piston travel. Mark the high point of travel, TDC.

Now while you hand crank, don't even look at the back of the magneto, listen for the snap. The snap should occur at TDC, or TDC plus a tich. Adjust the block until you get the snap at TDC + a tich. While hand cranking you want the spark to occur just before the piston starts heading back down after compression.

Spark before TDC can cause backfires and starter straps being ripped out of hands.

Spark well past TDC may be your problem, ignition with the exhaust starting to open.


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