The Stihl 028 AV is a legacy tool -- the German chain saw manufacturer released the first version of the 028 chain saw in 1977 -- about the same time that the first Apple computer was introduced -- and continued to manufacture it through the 1980s. "AV" stands for anti-vibration; the company no longer uses this designation because all of its contemporary models include advanced anti-vibration technology.
Arborists think highly of the Stihl 028, considering it solid and dependable, if a little underpowered for its weight.
- It weighs 12.6 pounds (5.7 kilograms), its piston displacement is 2.86 cubic inches (47 cubic centimeters) and the piston stroke is 1.22 inches (31 millimeters).
- It accepts guide bars of 16, 18 and 20 inches (40, 45 and 50 centimeters).
- The maximum speed of the two-stroke engine is 12,500 rpm, with bar and chain installed.
The Stihl 028 AV may not be as lightweight as modern Stihl chain saws, but it incorporates many of the same safety features:
- A chain brake, which is activated automatically if the saw kicks back and which can be activated by the operator by pressing a bar.
- A front handle guard protects the user's hand from branches and prevents it from slipping into the chain.
- A bumper spike projects into the wood being cut, stabilizing the saw and preventing kickback.
- A low-kickback chain with a pitch of of 0.325 inch for models with a seven-tooth chain sprocket and 0.375 inch for those with an eight-tooth sprocket. If the chain should break, a chain catcher prevents it from flying back toward the operator.
Fuel, Air and Ignition System
Because it employs a two-stroke engine, the Stihl 028 AV -- like most chain saws -- requires a mixture of gas and oil. According to the manual, the recommended gas-to-oil ratio is 50:1 or 40:1, when using a Stihl brand engine oil, and 25:1 when using other brands. Considering that most modern two-stroke oil formulations are equivalent, you're probably safe with a 40:1 mixture. Use gasoline with a minimum octane rating of 87.
The recommended spark plug characteristics include:
- Gap: 0.02 inch (0.5 millimeter)
- Thread: M14 X 1.25
- Length: 0.37 inch (9.5 millimeters)
The air filter is a bisectional, flat, wire mesh type. It's attached to the engine housing by a single screw and isn't generic -- you must special-order a new one when the one you're using wears out. Always use a brush to clean it -- never an air compressor.