Just bought a used Stihl 391 on Craigslist for $400 w/ 20" bar and new chain. Looked ok, started ok, seller told a pretty good story. Bucked thru 4 or 5 30" dia American Elm logs, ran strong. Then it stalls while cutting. Starts right up on 1st pull, runs about 15 seconds, then stalls (sounds like the fuel system is leaning out). Shot a video, posted to YouTube, https://youtu.be/SKfB7qj-LQI .
Stalls out like clockwork every 15 seconds, starts right up on 1st pull, runs for 15 seconds. It is full of high-dollar pre-mix gas, opened/closed fuel tank to verify it was not a tank venting issue.
Question for the experienced Stihl users, is there any particular issue that the 391 is known for that may be causing this strange stalling issue? ie weak fuel pump desigh, known carburator issues, or even something in the electronic ignition?
I will troubleshoot this saw and post the fix to this forum.
Stalls out like clockwork every 15 seconds, starts right up on 1st pull, runs for 15 seconds. It is full of high-dollar pre-mix gas, opened/closed fuel tank to verify it was not a tank venting issue.
Question for the experienced Stihl users, is there any particular issue that the 391 is known for that may be causing this strange stalling issue? ie weak fuel pump desigh, known carburator issues, or even something in the electronic ignition?
I will troubleshoot this saw and post the fix to this forum.