chemical dwell and verification steps around it
so this is the manufacturer's own position rather than our inference
HydraMaster list plug replacement on a scheduled interval for the Boxxer 421
For portable equipment: Use 30 grams of Flex FIRE rinse per 20 Litre of hot water
rough up surface of gum with a gum scraping tool
Briggs & Stratton 492341 Ignition Coil Assy Bridgepoint chemical dwell and verification stepsReplaces OEM: 492341, 490586, 491312, 495859, 690248, 715231, 591459 Genuine replacement armature coil. This ensures proper fit and performance to maintain the life of your Briggs & Stratton engine. Standard Pack: 1 Suits Briggs & Stratton 9 12. 5 14hp Vanguard V Twin engine models from 1990 til' present (2 required). Suits Briggs & Stratton 12 16hp side valve, single cylinder (L Head) engine models from 1980 to 2003 161430, 161432, 161436, 161437,