BRIGGS & STRATTON 843806 Lawn Mower Ring Set

The Briggs & Stratton 843806 Lawn Mower Ring Set seals the combustion chamber within the engine cylinder. Seated inside the piston grooves, these split-expansion bands exert continuous outward tension against the cylinder wall to form a gas-tight barrier during operation. This mechanical seal prevents high-pressure combustion gases from escaping into the crankcase and blocks engine oil from migrating upward into the firing chamber. By maintaining high compression levels and ensuring proper lubrication containment, the part protects engine power output and prevents smoke emissions caused by oil burning during use.