Stihl BR 600 Backpack Stalls: How to Fix It

Q: How often should I clean the spark arrestor screen on my Stihl BR 600?

Clean the spark arrestor screen every 25-30 hours of operation or at least once per season. Heavy use or operating in dusty conditions may require more frequent cleaning.

Q: Can I run my BR 600 without the spark arrestor screen?

Never operate the blower without the spark arrestor screen installed. It's required by law in most areas to prevent forest fires and is essential for safe operation around dry vegetation.

Q: What causes the spark arrestor screen to get clogged?

Carbon deposits from combustion naturally build up on the screen over time. Using low-quality fuel, incorrect fuel mixture ratios, or operating with a dirty air filter can accelerate clogging.

Q: How do I know if my spark arrestor screen needs replacing instead of cleaning?

Replace the screen if you find holes, tears, or areas where the mesh has burned away. Also replace if the screen doesn't come clean after proper cleaning or appears brittle and fragile.

Abstract

When your Stihl BR 600 backpack blower stalls frequently or won't stay running, a clogged spark arrestor screen is usually the culprit. This mesh screen prevents sparks from exiting the muffler but can become blocked with carbon deposits over time, restricting exhaust flow and causing the engine to stall.