How to Adjust Farmall Cub Timing Spark

The Farmall Cub is a vintage riding farm tractor manufactured by International Harvester. Although International Harvester went out of business in 1984, many people still own these tractors and parts are still manufactured by other companies. If the Farmall Cub backfires when it is started or if it runs poorly, it may be a sign that the timing plug, or spark plug gap, needs to be adjusted. It takes approximately 20 minutes to remove and reset the spark.

Wrench
Spark plug wrench
Spark gap setting tool

Instructions

- 1
  Open the engine cover and remove the Farmall's negative battery cable with the wrench.
- 2
  Find the Farmall's spark plugs on the right hand side of the engine block. The first plug is the timing spark plug.
- 3
  Pull off the tractor's spark plug wire with a pair of pliers and then remove the plug with a spark plug wrench.
- 4
  Set the spark gap tool by hand to .023 inches and then place the tool into the spark plug gap. Use the pliers to adjust the gap.
- 5
  Screw the spark plug back in by hand and then tighten it with the plug wrench. Replace the spark plug wire.
- 6
  Replace the Farmall's negative battery cable and then close the engine compartment.

How to Make a Lawn Mower Quiet

What Is a Vertical Mower?

Lawn Mowers