John Deere 4020 LP tune up specs

They are in the operator's manual. There are at least four different versions, be sure to get the one that covers that tractor's serial number or it will mislead you.

There is much other useful information in that manual that will help you use the tractor.

Gerald J.
 
Put a second battery on it like a diesel and install petronix electronic ignition. They both make it a better tractor to start. Be careful taking the plugs out, they can come out hard at times, and never seize the new ones. chris
 

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