Mercury outboard spare part 858778 (STUD (M10 x 91)). 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), 115 HP 3 CYL (1.5L), 175 HP V6 CYL (2.5L), 250 HP XS 6 CYL (3.0L), 75 HP 3 CYL (1.5L), 90 HP 3 CYL (1.5L), 200 HP DTS 6 CYL (3.0L), 200 HP Pro XS 6 CYL (3.0L), 225 HP DTS 6 CYL (3.0L), 225 HP Pro XS 6 CYL (3.0L), 250 HP 6 CYL (3.0L), 250 HP Pro XS 6 CYL (3.0L), 80 HP Jet 3 CYL (1.5L), 110 Jet (2.5L), 115 HP Pro XS 3 CYL (1.5L), 115 HP V6 CYL (2.5L), 125 HP 3 CYL (1.5L), 150 HP Pro XS 6 CYL (2.5L), 175 HP Pro XS 6 CYL (2.5L), 2.5XS (2.5L), 225 HP Sport XS 6 CYL (3.0L). Select a model tag above to open the exploded diagram and confirm the position.

Part Specifications and Installation Reference

Mercury outboard part 858778 (STUD (M10 x 91)), documented in 53 exploded diagram location(s), across the 2-STROKE-CARB, 2-STROKE-DFI-OPTIMAX, 2-STROKE-EFI series.

SeriesModelSerial rangeREFQtyDiagram
Mercury 2-STROKE-CARB110-jet-2-5l1B690542 THRU 1B974227294View
Mercury 2-STROKE-DFI-OPTIMAX115-hp-3-cyl-1-5l0T801000 THRU 1B22699912View
Mercury 2-STROKE-DFI-OPTIMAX115-hp-3-cyl-1-5l1B227000 THRU 1B41770112View
Mercury 2-STROKE-DFI-OPTIMAX115-hp-3-cyl-1-5l1B736885 THRU 2B01876312View
Mercury 2-STROKE-DFI-OPTIMAX115-hp-pro-xs-3-cyl-1-5l1B751825 THRU 2B12342912View
Mercury 2-STROKE-DFI-OPTIMAX115-hp-v6-cyl-2-5l0G960500 THRU 0T178499254View
Mercury 2-STROKE-DFI-OPTIMAX125-hp-3-cyl-1-5l1B736885 THRU 2B11278712View
Mercury 2-STROKE-DFI-OPTIMAX150-hp-pro-xs-6-cyl-2-5l1B690542 THRU 2B535572254View
Mercury 2-STROKE-DFI-OPTIMAX175-hp-pro-xs-6-cyl-2-5l1B516339 THRU 2B535624294View
Mercury 2-STROKE-DFI-OPTIMAX175-hp-v6-cyl-2-5l0T178500 THRU 0T800999294View
Mercury 2-STROKE-DFI-OPTIMAX175-hp-v6-cyl-2-5l0T801000 THRU 1B226999294View
Mercury 2-STROKE-DFI-OPTIMAX175-hp-v6-cyl-2-5l1B227000 THRU 1B417701294View
Mercury 2-STROKE-DFI-OPTIMAX175-hp-v6-cyl-2-5l1B417702 THRU 1B508457294View
Mercury 2-STROKE-DFI-OPTIMAX2-5xs-2-5l0T997974 THRU 1E000796314View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l0G590000 THRU 0G760299314View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l0G760300 THRU 0G960499314View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l0G960500 THRU 0T178499314View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l0T801000 THRU 1B417701314View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l1B417702 THRU 1B504988314View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l1B504989 THRU 1B912785314View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-6-cyl-3-0l1B912786 THRU 2B535571314View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-dts-6-cyl-3-0l0T980000 THRU 1B417701314View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-dts-6-cyl-3-0l1B417702 THRU 1B504988314View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-dts-6-cyl-3-0l1B504989 THRU 1B964735314View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-pro-xs-6-cyl-3-0l1B504989 THRU 1B912785314View
Mercury 2-STROKE-DFI-OPTIMAX200-hp-pro-xs-6-cyl-3-0l1B912786 THRU 2B535571314View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-6-cyl-3-0l0G590000 THRU 0G760299314View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-6-cyl-3-0l0G760300 THRU 0G960499314View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-6-cyl-3-0l0G960500 THRU 0T178499314View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-6-cyl-3-0l0T801000 THRU 1B417701314View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-6-cyl-3-0l1B417702 THRU 1B504988314View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-6-cyl-3-0l1B504989 THRU 2B535086314View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-dts-6-cyl-3-0l0T599000 THRU 1B417701314View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-dts-6-cyl-3-0l1B417702 THRU 1B504988314View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-dts-6-cyl-3-0l1B504989 THRU 1B964735314View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-sport-xs-6-cyl-3-0l1E000797 THRU 1E002583314View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-6-cyl-3-0l1B528615 THRU 2B535086314View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-pro-xs-6-cyl-3-0l1B426561 THRU 1B752546314View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-pro-xs-6-cyl-3-0l1B752547 THRU 2B535608314View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l0T651945 THRU 0T818042314View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l0T818043 THRU 0T997973314View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l0T997974 THRU 1E000796314View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l1E000797 THRU 1E002341314View
Mercury 2-STROKE-DFI-OPTIMAX75-hp-3-cyl-1-5l0T980000 THRU 1B22699912View
Mercury 2-STROKE-DFI-OPTIMAX75-hp-3-cyl-1-5l1B227000 THRU 1B41770112View
Mercury 2-STROKE-DFI-OPTIMAX75-hp-3-cyl-1-5l1B736885 THRU 2B11257712View
Mercury 2-STROKE-DFI-OPTIMAX80-hp-jet-3-cyl-1-5l1B736885 THRU 2B11184012View
Mercury 2-STROKE-DFI-OPTIMAX90-hp-3-cyl-1-5l0T801000 THRU 1B22699912View
Mercury 2-STROKE-DFI-OPTIMAX90-hp-3-cyl-1-5l1B227000 THRU 1B41770112View
Mercury 2-STROKE-DFI-OPTIMAX90-hp-3-cyl-1-5l1B736885 THRU 1B97425812View
Mercury 2-STROKE-DFI-OPTIMAXjp-3-0l0T997974 THRU 1E003045314View
Mercury 2-STROKE-DFI-OPTIMAXjp-3-0l1E003046 THRU 1E052824314View
Mercury 2-STROKE-EFI300x-3-0l-pro-max0T235084 THRU 0T429939314View

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Appears in diagrams of these models

  • 200 HP 6 CYL (3.0L)
  • 225 HP 6 CYL (3.0L)
  • 115 HP 3 CYL (1.5L)
  • 175 HP V6 CYL (2.5L)
  • 250 HP XS 6 CYL (3.0L)
  • 75 HP 3 CYL (1.5L)
  • 90 HP 3 CYL (1.5L)
  • 200 HP DTS 6 CYL (3.0L)
  • 200 HP Pro XS 6 CYL (3.0L)
  • 225 HP DTS 6 CYL (3.0L)
  • 225 HP Pro XS 6 CYL (3.0L)
  • 250 HP 6 CYL (3.0L)
  • 250 HP Pro XS 6 CYL (3.0L)
  • 80 HP Jet 3 CYL (1.5L)
  • 110 Jet (2.5L)
  • 115 HP Pro XS 3 CYL (1.5L)
  • 115 HP V6 CYL (2.5L)
  • 125 HP 3 CYL (1.5L)
  • 150 HP Pro XS 6 CYL (2.5L)
  • 175 HP Pro XS 6 CYL (2.5L)
  • 2.5XS (2.5L)
  • 225 HP Sport XS 6 CYL (3.0L)