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Need John Deere 420 help?


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#1 baszkopiec OFFLINE  

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Posted September 26, 2011 - 07:35 AM

Had it a few years now with no problems but it started running bad revving up and down. checked plugs not long after it was started and one of them was hot and one was still pretty cold.I'm no super mechanic as far as diagnosis so can someone point me in the right direction? Thanks for any help you guys can give me. oh it is a onan p22og engine.

#2 KennyP ONLINE  

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Posted September 26, 2011 - 07:38 AM

Welcome! I'm no guru on that Onan, hope someone will be along shortly who is. Glad you joined, plenty of JD folks on here.

#3 mikebramel OFFLINE  

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Posted September 26, 2011 - 08:43 AM

So youre saying one cylinder isnt running? The exhaust on that side would be cold too. Check the coil for spark on both sides, or you may have dropped a valve seat on a Performer or broke a rod

#4 baszkopiec OFFLINE  

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Posted September 27, 2011 - 11:44 AM

rod or valve seat huh i'll check the coil in a day or so if I have time after work

#5 olcowhand ONLINE  

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Posted September 27, 2011 - 12:16 PM

If you find no spark on one side, then swap spark plug wires. If the other wire now has no spark, then you have one side of the ignition coil dead & need to replace the coil. If you swap the wires & the same spark plug isn't getting fire, then it's time for new spark plug wires.
Check out the spark first, then let us know. We'll go from there.




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