Mercury outboard spare part 8M0146659 (GEAR SET Counter Rotation, Forward/Pinion 1.75 Ratio (12/21)). Supplied by Dimo Marine for wholesale and export — genuine and quality aftermarket options available.

Fits 150R HP 3.4L V6, 200R HP 3.4L V6 Racing, 300 HP 4.6L V8, 200 HP 4.6L V8 Pro XS, 225 HP 4.6L V8 Pro XS, 225 HP 4.6L V8 SeaPro, 250 HP 4.6L V8 Pro XS, 250 HP 4.6L V8 SeaPro, 250 HP 4.6L V8 Verado, 250 HP 4.6L V8, 250R HP 4.6L V8 Racing, 300 HP 4.6L V8 AMS SeaPro, 300 HP 4.6L V8 CMS SeaPro, 300 HP 4.6L V8 CMS, 300 HP 4.6L V8 Pro XS, 300 HP 4.6L V8 Verado, 300R HP 4.6L V8 Racing, 200 HP Verado 6 CYL, 200 ROS HP 3.4L V6 15 Inch Midsection Racing, 200R HP 3.4L V6 15 Inch Midsection Racing, 225 HP Verado 6 CYL, 250 HP Verado 6 CYL, 275 HP Verado 6 CYL, 300 HP Verado 6 CYL, 350 HP 2.6L L6 Pro Verado, 350 HP 2.6L L6 Verado, 400 HP 2.6L L6 Verado, 400R HP 2.6L L6 Racing. Select a model tag above to open the exploded diagram and confirm the position.

Part Specifications and Installation Reference

Mercury outboard part 8M0146659 (GEAR SET Counter Rotation, Forward/Pinion 1.75 Ratio (12/21)), documented in 30 exploded diagram location(s), across the 4-STROKE-EFI series.

SeriesModelSerial rangeREFQtyDiagram
Mercury 4-STROKE-EFI150r-hp-3-4l-v63B547096 UP-, 311View
Mercury 4-STROKE-EFI150r-hp-3-4l-v63B648748 UP-1View
Mercury 4-STROKE-EFI200-hp-4-6l-v8-pro-xs2B529482 UP-, 201View
Mercury 4-STROKE-EFI200-hp-verado-6-cyl2B144123 THRU 2B578935191View
Mercury 4-STROKE-EFI200-ros-hp-3-4l-v6-15-inch-midsection-racing1E054618 UP-1View
Mercury 4-STROKE-EFI200r-hp-3-4l-v6-15-inch-midsection-racing1E054618 UP-1View
Mercury 4-STROKE-EFI200r-hp-3-4l-v6-racing3B547096 UP-, 311View
Mercury 4-STROKE-EFI200r-hp-3-4l-v6-racing3B648748 UP-1View
Mercury 4-STROKE-EFI225-hp-4-6l-v8-pro-xs2B529482 UP-, 201View
Mercury 4-STROKE-EFI225-hp-4-6l-v8-seapro2B529482 UP-, 201View
Mercury 4-STROKE-EFI225-hp-verado-6-cyl2B144123 THRU 2B578935191View
Mercury 4-STROKE-EFI250-hp-4-6l-v82B529482 UP-, 201View
Mercury 4-STROKE-EFI250-hp-4-6l-v8-pro-xs2B529482 UP-, 201View
Mercury 4-STROKE-EFI250-hp-4-6l-v8-seapro2B529482 UP-, 201View
Mercury 4-STROKE-EFI250-hp-4-6l-v8-verado2B529482 UP-, 201View
Mercury 4-STROKE-EFI250-hp-verado-6-cyl2B144123 THRU 2B578935191View
Mercury 4-STROKE-EFI250r-hp-4-6l-v8-racing1E080500 UP-, 201View
Mercury 4-STROKE-EFI275-hp-verado-6-cyl2B144123 THRU 2B578935191View
Mercury 4-STROKE-EFI300-hp-4-6l-v82B529482 UP-1View
Mercury 4-STROKE-EFI300-hp-4-6l-v8-ams-seapro2B529482 UP-, 201View
Mercury 4-STROKE-EFI300-hp-4-6l-v8-cms2B529482 UP-, 201View
Mercury 4-STROKE-EFI300-hp-4-6l-v8-cms-seapro2B529482 UP-, 201View
Mercury 4-STROKE-EFI300-hp-4-6l-v8-pro-xs2B529482 UP-, 201View
Mercury 4-STROKE-EFI300-hp-4-6l-v8-verado2B529482 UP-, 201View
Mercury 4-STROKE-EFI300-hp-verado-6-cyl2B144123 THRU 2B578935191View
Mercury 4-STROKE-EFI300r-hp-4-6l-v8-racing1E080500 UP-, 201View
Mercury 4-STROKE-EFI350-hp-2-6l-l6-pro-verado2B141124 THRU 3B342962191View
Mercury 4-STROKE-EFI350-hp-2-6l-l6-verado2B141617 THRU 3B342962191View
Mercury 4-STROKE-EFI400-hp-2-6l-l6-verado2B618256 THRU 3B342962191View
Mercury 4-STROKE-EFI400r-hp-2-6l-l6-racing2B141124 THRU 3B342962191View

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Appears in diagrams of these models

  • 150R HP 3.4L V6
  • 200R HP 3.4L V6 Racing
  • 300 HP 4.6L V8
  • 200 HP 4.6L V8 Pro XS
  • 225 HP 4.6L V8 Pro XS
  • 225 HP 4.6L V8 SeaPro
  • 250 HP 4.6L V8 Pro XS
  • 250 HP 4.6L V8 SeaPro
  • 250 HP 4.6L V8 Verado
  • 250 HP 4.6L V8
  • 250R HP 4.6L V8 Racing
  • 300 HP 4.6L V8 AMS SeaPro
  • 300 HP 4.6L V8 CMS SeaPro
  • 300 HP 4.6L V8 CMS
  • 300 HP 4.6L V8 Pro XS
  • 300 HP 4.6L V8 Verado
  • 300R HP 4.6L V8 Racing
  • 200 HP Verado 6 CYL
  • 200 ROS HP 3.4L V6 15 Inch Midsection Racing
  • 200R HP 3.4L V6 15 Inch Midsection Racing
  • 225 HP Verado 6 CYL
  • 250 HP Verado 6 CYL
  • 275 HP Verado 6 CYL
  • 300 HP Verado 6 CYL
  • 350 HP 2.6L L6 Pro Verado
  • 350 HP 2.6L L6 Verado
  • 400 HP 2.6L L6 Verado
  • 400R HP 2.6L L6 Racing