The Stihl 029 chain saw can help you tackle backyard cutting jobs that a manual saw isn't stout enough to handle. A review of this tool's specifications can help you make a purchasing decision or simply give you an at-a-glance reference for replacement parts.


The Stihl 029 is powered by a single-cylinder, two-stroke engine.

Engine Measurements

  • Piston displacement: 3.45 cubic inches.
  • Cylinder bore: 1.81 inches.
  • Piston stroke: 1.34 inches.

Engine Speed

  • Idle speed: 2,800 rpm.
  • Maximum speed (cut-off speed): 12,500 rpm.

Fuel System

Because chain saws must be able to work when held at different angles, a conventional "float-type" carburetor, which senses the fuel level, won't work. To solve this problem, the Stihl 029 has an "all-position diaphragm carburetor." Instead of a carburetor float sensor, the integral fuel pump relies on a flexible disk -- called a diaphragm -- to signal the need for more fuel.

  • Air filters: a prefilter (coarse) and a bisectional box filter.
  • Fuel mixture: The Stihl 029 uses a fuel mixture made of gasoline and oil in a 50:1 ratio -- this means to add 1 part oil to 50 parts gasoline.
  • Engine oil: Stihl two-stroke engine oil or a comparable brand, classified "TC."
  • Fuel tank capacity: 1.2 pints.
  • Oil tank capacity: 0.68 pint.

Ignition System

The Stihl 029 has a magneto-type, breakerless ignition system.

Spark Plugs (Suppressed)

  • Type: Bosch WSR 6 F.
  • Heat range: 200.
  • Electrode gap: 0.02 inch.
  • Spark plug thread: M 14 x 1.25, 0.37 inch long.

Bar and Chain

A chain saw works on a chain-and-bar principle. When the engine drives the chain -- with embedded teeth -- around a guide bar, the teeth cut the wood.

Guide Bar

  • Type: Stihl reduced kickback bar (green label) -- Rollomatic with sprocket nose.
  • Lengths: 16, 18 or 20 inches.


  • Type: Stihl low-kickback chain (green label) -- Rapid-Micro 2, 0.325 inch (26 RM 2) or Rapid-Micro 2, 3/8 inch (33 RM 2, 36 RM 2).
  • Chain sprocket: seven-tooth or eight-tooth for 0.325-inch pitch, seven-tooth for 3/8-inch pitch.

Safety Features

  • Front hand guard. Protects the forward hand against protruding branches and keeps the hand in back from touching the chain in case it slips off the guide bar.
  • Rear hand guard. Protects the right hand.
  • Chain brake. If the chain saw experiences kickback, the chain brake stops the chain from rotating.
  • Chain catcher. Helps prevent a loose or broken chain from cutting the operator.