McCulloch 4000 chainsaw parts diagram and tuning information

Here’s a scanned parts diagram for an old McCulloch 4000 chainsaw, made in Italy, with a Tillotson carb. This is a little different than the ‘4000 California’ model.

mcculloch-4000
Click for full size

The operator manual shared for the 3500/4000 series doesn’t have anything too interesting, but here’s the key information:

Fuel Mixture:

  • McCulloch oil 40:1
  • SAE40 2t 20:1

Chain Oil:

  • SAE 30 motor oil, or McCulloch chain oil no.201349
  • Refill the oil tank each time the saw is refueled

Tuning specs:

  • Spark plug gap: .5-.6 mm
  • Low speed base tune: 1 full turn out from closed
  • High speed base tune: 1 full turn out from closed

Service specs:

  • Chain tooth angle: 35 degrees
  • Every 10 hours: Remove sparkplug, clean and adjust gap
  • Every 20 hours: Replace sparkplug
  • Once a year: Contact your dealer for a full service (no explanation of what this includes)
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