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Magneto ignition misfire

M

Mathias NY

Well-known Member
I went to try cultivating with my Deere H this afternoon but ran into some trouble. It has had a bit of a misfire on one cylinder for a while now, so I decided to change the plug wires. Now instead of a misfire, it definitively runs on one cylinder. If I pull the plug wire off the non-firing cylinder while the tractor is running and hold it 1/4" away from the plug, it will throw a nice blue spark and allow the cylinder to fire. If I reconnect it, it stops firing. I'm confused.

Has anyone else experienced this before?

Thanks!
 
YESSSSSSSSSS Ive had that before, manyyyyyyyyyyyy times when a plug was fouling.

FWIW I AGREE. If a plug wont fire but will if you remove the wire just off the plug and let the spark jump, its indicative of a fouling plug. The reason for that is if oil or soot or carbon are providing a shorting conductive path for the coils energy, it will bleed off and not rise to a sudden high enough voltage to arc jump the plug gap.

The same (only) set of points and condensor and coil fires BOTH plugs, so if you have a situation where one wont fire but the other one will, typical causes are in the cap and rotor or a bad plug wire or as above, a bad plug. You can swap plugs and wires to see if its a wire or plug problem or if it stays on one cap terminal alllllllllll the time regardless.

Clean and check and gap the points (replace if badly burned or pitted) and install a fresh set of plugs and see what happens, if no cure post back

John T
 
Just use a piece of balling wire wrap it around the porcelain part of the plug. Then make a loop for the wire to go on. With it gapped so it will hit. It will clean up a plug that misses. Also will probably not start after running that way for 10 minutes. Then take the wire off and let it run on the plug.
 
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