Mercury outboard spare part 850309 (PLUG). Supplied by Dimo Marine for wholesale and export — genuine and quality aftermarket options available.

Fits 200 HP 6 CYL (3.0L), 225 HP 6 CYL (3.0L), 250 HP XS 6 CYL (3.0L), 225 (3.0L), 200 (3.0L), 200 HP DTS 6 CYL (3.0L), 225 HP DTS 6 CYL (3.0L), 250 (3.0L), 225 (3.0L), 225 MARATHON (3.0L), 225 SEAPRO (3.0L), 200 HP Pro XS 6 CYL (3.0L), 250 HP Sport XS 6 CYL (2.5L), 300 HP XS 6 CYL (3.2L), JP (3.0L), 225 HP SPORT XS 6 CYL (2.5L), 225 HP Sport XS 6 CYL (3.0L), 225 HP XS 6 CYL (2.5L), 250 HP 6 CYL (3.0L), 3.0L DSI (Diesel Spark Ignition), 225 (3.0L) MARATHON, 225 (3.0L) SEAPRO, 250XB (3.0L). Select a model tag above to open the exploded diagram and confirm the position.

Part Specifications and Installation Reference

Mercury outboard part 850309 (PLUG), documented in 67 exploded diagram location(s), across the 2-STROKE-CARB, 2-STROKE-DFI-OPTIMAX, 2-STROKE-EFI series.

SeriesModelSerial rangeREFQtyDiagram
Mercury 2-STROKE-CARB225-3-0l0D280813 THRU 0G760299216View
Mercury 2-STROKE-CARB225-3-0l0G760300 THRU 0T408999216View
Mercury 2-STROKE-CARB225-marathon-3-0l0G245605 THRU 0G760299216View
Mercury 2-STROKE-CARB225-marathon-3-0l0G760300 THRU 0T408999216View
Mercury 2-STROKE-CARB225-seapro-3-0l0G245605 THRU 0G760299216View
Mercury 2-STROKE-CARB225-seapro-3-0l0G760300 THRU 0T408999216View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l0G590000 THRU 0G760299106View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l0G760300 THRU 0G960499106View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l0G960500 THRU 0T178499106View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l0T801000 THRU 1B417701106View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l1B417702 THRU 1B504988106View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l1B504989 THRU 1B912785106View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l1B912786 THRU 2B535571106View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-dts-6-cyl-3-0l0T980000 THRU 1B417701106View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-dts-6-cyl-3-0l1B417702 THRU 1B504988106View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-dts-6-cyl-3-0l1B504989 THRU 1B964735106View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-pro-xs-6-cyl-3-0l1B504989 THRU 1B912785106View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-pro-xs-6-cyl-3-0l1B912786 THRU 2B535571106View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-6-cyl-3-0l0G590000 THRU 0G760299106View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-6-cyl-3-0l0G760300 THRU 0G960499106View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-6-cyl-3-0l0G960500 THRU 0T178499106View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-6-cyl-3-0l0T801000 THRU 1B417701106View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-6-cyl-3-0l1B417702 THRU 1B504988106View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-6-cyl-3-0l1B504989 THRU 2B535086106View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-dts-6-cyl-3-0l0T599000 THRU 1B417701106View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-dts-6-cyl-3-0l1B417702 THRU 1B504988106View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-dts-6-cyl-3-0l1B504989 THRU 1B964735106View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-sport-xs-6-cyl-2-5l1E002584 THRU 1E050825106View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-sport-xs-6-cyl-3-0l1E000797 THRU 1E002583106View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-xs-6-cyl-2-5l1E002584 THRU 1B792195106View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-6-cyl-3-0l1B528615 THRU 2B535086106View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-sport-xs-6-cyl-2-5l1E002342 THRU 1E051823106View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-sport-xs-6-cyl-2-5l1E051824 THRU 1E052994106View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l0T651945 THRU 0T818042106View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l0T818043 THRU 0T997973106View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l0T997974 THRU 1E000796106View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l1E000797 THRU 1E002341106View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l1E002342 THRU 1E051113106View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l1E053158 THRU 1E053958106View
Mercury 2-STROKE-DFI-OPTIMAX3-0l-dsi-diesel-spark-ignition1E052967 THRU 1E054191106View
Mercury 2-STROKE-DFI-OPTIMAX300-hp-xs-6-cyl-3-2l1E001867 THRU 1E052057106View
Mercury 2-STROKE-DFI-OPTIMAX300-hp-xs-6-cyl-3-2l1E052058 THRU 1E053987106View
Mercury 2-STROKE-DFI-OPTIMAXjp-3-0l1E003046 THRU 1E052824106View
Mercury 2-STROKE-EFI200-3-0l0T750164 THRU 0T800999106View
Mercury 2-STROKE-EFI200-3-0l0T801000 THRU 1B417701106View
Mercury 2-STROKE-EFI200-3-0l1B417702 THRU 1B504988106View
Mercury 2-STROKE-EFI200-3-0l1B504989 THRU 2B528096106View
Mercury 2-STROKE-EFI225-3-0l0G129222 THRU 0G760299216View
Mercury 2-STROKE-EFI225-3-0l0G760300 THRU 0T408999126View
Mercury 2-STROKE-EFI225-3-0l0T409000 THRU 0T800999216View
Mercury 2-STROKE-EFI225-3-0l0T801000 THRU 1B417701106View
Mercury 2-STROKE-EFI225-3-0l1B417702 THRU 1B504988106View
Mercury 2-STROKE-EFI225-3-0l1B504989 THRU 2B528096106View
Mercury 2-STROKE-EFI225-3-0l-marathon0T801000 THRU 1B417701106View
Mercury 2-STROKE-EFI225-3-0l-seapro0T801000 THRU 1B417701106View
Mercury 2-STROKE-EFI250-3-0l0G129222 THRU 0G760299216View
Mercury 2-STROKE-EFI250-3-0l0G760300 THRU 0T408999126View
Mercury 2-STROKE-EFI250-3-0l0T409000 THRU 0T800999216View
Mercury 2-STROKE-EFI250-3-0l0T801000 THRU 1B417701106View
Mercury 2-STROKE-EFI250-3-0l1B417702 THRU 1B504988106View
Mercury 2-STROKE-EFI250-3-0l1B504989 THRU 2B528096106View
Mercury 2-STROKE-EFI250-l-3-0l0T861319 THRU 1B118897106View
Mercury 2-STROKE-EFI250xb-3-0l0G980600 THRU 0T800999216View
Mercury 2-STROKE-EFI3-0l-marathon0T409000 THRU 0T800999106View
Mercury 2-STROKE-EFI3-0l-seapro0T409000 THRU 0T800999106View
Mercury 2-STROKE-EFI300-3-0l-promax0G610221 THRU 0T105297106View
Mercury 2-STROKE-EFI300-3-0l-supermagnum0G610221 THRU 0T105297106View

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Appears in diagrams of these models

  • 200 HP 6 CYL (3.0L)
  • 225 HP 6 CYL (3.0L)
  • 250 HP XS 6 CYL (3.0L)
  • 225 (3.0L)
  • 200 (3.0L)
  • 200 HP DTS 6 CYL (3.0L)
  • 225 HP DTS 6 CYL (3.0L)
  • 250 (3.0L)
  • 225 (3.0L)
  • 225 MARATHON (3.0L)
  • 225 SEAPRO (3.0L)
  • 200 HP Pro XS 6 CYL (3.0L)
  • 250 HP Sport XS 6 CYL (2.5L)
  • 300 HP XS 6 CYL (3.2L)
  • JP (3.0L)
  • 225 HP SPORT XS 6 CYL (2.5L)
  • 225 HP Sport XS 6 CYL (3.0L)
  • 225 HP XS 6 CYL (2.5L)
  • 250 HP 6 CYL (3.0L)
  • 3.0L DSI (Diesel Spark Ignition)
  • 225 (3.0L) MARATHON
  • 225 (3.0L) SEAPRO
  • 250XB (3.0L)