Head Cover Gasket – Fits Mercury/Johnson/Evinrude 20 HP (Replaces 27-78410, 508810) 435HP It explicitly excludes 4

It explicitly excludes 4

making it ideal for outdoor and marine use

Clean the mounting surface on the engine block to ensure the new tensioner sits flush

Notes Yamaha 40EJRQ 40 2-Stroke 1992 6H4-W0078-00-00 Yamaha 40EJRR 40 2-Stroke 1993 6H4-W0078-00-00 Yamaha 40EJRS 40 2-Stroke 1994 6H4-W0078-00-00 Yamaha 40ELRQ 40 2-Stroke 1992 6H4-W0078-00-00 Yamaha 40ELRR 40 2-Stroke 1993 6H4-W0078-00-00 Yamaha 40ELRS 40 2-Stroke 1994 6H4-W0078-00-00 Yamaha 40ESRQ 40 2-Stroke 1992 6H4-W0078-00-00 Yamaha 40ESRR 40 2-Stroke 1993 6H4-W0078-00-00 Yamaha 40ESRS 40 2-Stroke 1994 6H4-W0078-00-00 Yamaha 40MJHQ 40 2-Stroke 1992 6H4-W0078-00-00 Yamaha 40MJHR 40 2-Stroke 1993 6H4-W0078-00-00 Yamaha 40MJHS 40 2-Stroke 1994 6H4-W0078-00-00 Yamaha 40MLHQ 40 2-Stroke 1992 6H4-W0078-00-00 Yamaha 40MLHR 40 2-Stroke 1993 6H4-W0078-00-00 Yamaha 40MLHS 40 2-Stroke 1994 6H4-W0078-00-00 Yamaha 40MSHQ 40 2-Stroke 1992 6H4-W0078-00-00 Yamaha 40MSHR 40 2-Stroke 1993 6H4-W0078-00-00 Yamaha 40MSHS 40 2-Stroke 1994 6H4-W0078-00-00 Yamaha 40PLRQ 40 2-Stroke 1992 6H4-W0078-00-00 Yamaha 40PLRR 40 2-Stroke 1993 6H4-W0078-00-00 Yamaha 40PLRS 40 2-Stroke 1994 6H4-W0078-00-00 Yamaha 40TLRS 40 2-Stroke 1994 6H4-W0078-00-00 Yamaha 50EJRQ 50 2-Stroke 1992 6H4-W0078-00-00 Yamaha 50EJRR 50 2-Stroke 1993 6H4-W0078-00-00 Yamaha 50EJRS 50 2-Stroke 1994 6H4-W0078-00-00 Yamaha 50ELRQ 50 2-Stroke 1992 6H4-W0078-00-00 Yamaha 50ELRR 50 2-Stroke 1993 6H4-W0078-00-00 Yamaha 50ELRS 50 2-Stroke 1994 6H4-W0078-00-00 Yamaha 50ESRS 50 2-Stroke 1994 6H4-W0078-00-00 Yamaha 50TLHQ 50 2-Stroke 1992 6H4-W0078-00-00 Yamaha 50TLHR 50 2-Stroke 1993 6H4-W0078-00-00 Yamaha 50TLHS 50 2-Stroke 1994 6H4-W0078-00-00 Yamaha P50TLRQ 50 2-Stroke 1992 6H4-W0078-00-00 Pro50 Series Yamaha P50TLRR 50 2-Stroke 1993 6H4-W0078-00-00 Pro50 Series Yamaha P50TLRS 50 2-Stroke 1994 6H4-W0078-00-00 Pro50 Series Yamaha C25

Head Cover Gasket – Fits Mercury/Johnson/Evinrude 20 HP (Replaces 27-78410, 508810) 435HP It explicitly excludes 4Product Details This high quality Head Cover Gasket is designed to provide a reliable seal for a range of outboard motors, including specific Mercury, Johnson Evinrude, and Chrysler 2 stroke models from 19781980. It ensures a precise fit to prevent leaks and maintain engine performance. This gasket serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 27 78410, 52579, 72916, 78410; OMC Johnson Evinrude 508810;