The service manual provides the specific data for your saw. General mechanic logic can lead to cracked casings or seized engines.
The 084 AV is known for "hard pulls." This is often caused by a sticking or failing . If the starter rope is difficult to pull even with the valve engaged, inspect the lever and spring for wear. Good engine health typically shows a compression reading of around 170 PSI. 2. Fuel System Issues If the saw won't start or stalls, check for: stihl 084 av service manual