Mercury outboard spare part 878087A6 (GEAR SET Forward/Pinion). Supplied by Dimo Marine for wholesale and export — genuine and quality aftermarket options available.

Fits 250 HP XS 6 CYL (3.0L), 300X (3.0L) PRO MAX, 300 HP XS 6 CYL (3.2L), 250 HP Sport XS 6 CYL (2.5L), 300 (3.0L) ProMax, 300 (3.0L) SuperMagnum, 2.5XS (2.5L), 225 HP SPORT XS 6 CYL (2.5L), 225 HP Sport XS 6 CYL (3.0L), 225 HP XS 6 CYL (2.5L). Select a model tag above to open the exploded diagram and confirm the position.

Part Specifications and Installation Reference

Mercury outboard part 878087A6 (GEAR SET Forward/Pinion), documented in 16 exploded diagram location(s), across the 2-STROKE-DFI-OPTIMAX, 2-STROKE-EFI series.

SeriesModelSerial rangeREFQtyDiagram
Mercury 2-STROKE-DFI-OPTIMAX2-5xs-2-5l0T997974 THRU 1E00079681View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-sport-xs-6-cyl-2-5l1E002584 THRU 1E05082581View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-sport-xs-6-cyl-3-0l1E000797 THRU 1E00258381View
Mercury 2-STROKE-DFI-OPTIMAX225-hp-xs-6-cyl-2-5l1E002584 THRU 1B79219581View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-sport-xs-6-cyl-2-5l1E002342 THRU 1E05182381View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-sport-xs-6-cyl-2-5l1E051824 THRU 1E05299481View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l0T818043 THRU 0T99797381View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l0T997974 THRU 1E00079681View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l1E000797 THRU 1E00234181View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l1E002342 THRU 1E05111381View
Mercury 2-STROKE-DFI-OPTIMAX250-hp-xs-6-cyl-3-0l1E053158 THRU 1E05395881View
Mercury 2-STROKE-DFI-OPTIMAX300-hp-xs-6-cyl-3-2l1E001867 THRU 1E05205781View
Mercury 2-STROKE-DFI-OPTIMAX300-hp-xs-6-cyl-3-2l1E052058 THRU 1E05398781View
Mercury 2-STROKE-EFI300-3-0l-promax0G610221 THRU 0T10529747, 531View
Mercury 2-STROKE-EFI300-3-0l-supermagnum0G610221 THRU 0T10529747, 531View
Mercury 2-STROKE-EFI300x-3-0l-pro-max0T429940 THRU 0T99958747, 81View

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Appears in diagrams of these models

  • 250 HP XS 6 CYL (3.0L)
  • 300X (3.0L) PRO MAX
  • 300 HP XS 6 CYL (3.2L)
  • 250 HP Sport XS 6 CYL (2.5L)
  • 300 (3.0L) ProMax
  • 300 (3.0L) SuperMagnum
  • 2.5XS (2.5L)
  • 225 HP SPORT XS 6 CYL (2.5L)
  • 225 HP Sport XS 6 CYL (3.0L)
  • 225 HP XS 6 CYL (2.5L)