Mercury outboard spare part 8M0078258 (GEAR SET Standard Rotation, Forward/Pinion, 1.75 Ratio (12/21)). Supplied by Dimo Marine for wholesale and export — genuine and quality aftermarket options available.
Fits 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, 250 HP Verado 6 CYL. Select a model tag above to open the exploded diagram and confirm the position.
Mercury outboard part 8M0078258 (GEAR SET Standard Rotation, Forward/Pinion, 1.75 Ratio (12/21)), documented in 30 exploded diagram location(s), across the 4-STROKE-EFI series.
| Series | Model | Serial range | REF | Qty | Diagram |
|---|---|---|---|---|---|
| Mercury 4-STROKE-EFI | 150r-hp-3-4l-v6 | 3B547096 UP | -, 5 | 1 | View |
| Mercury 4-STROKE-EFI | 150r-hp-3-4l-v6 | 3B648748 UP | -, 5 | 1 | View |
| Mercury 4-STROKE-EFI | 200-hp-verado-6-cyl | 0P520553 THRU 2B144122 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 200-hp-verado-6-cyl | 1B517434 THRU 2B144122 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 200-hp-verado-6-cyl | 2B144123 THRU 2B578935 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 200-ros-hp-3-4l-v6-15-inch-midsection-racing | 1E054618 UP | -, 5 | 1 | View |
| Mercury 4-STROKE-EFI | 200r-hp-3-4l-v6-15-inch-midsection-racing | 1E054618 UP | -, 5 | 1 | View |
| Mercury 4-STROKE-EFI | 200r-hp-3-4l-v6-racing | 3B547096 UP | -, 5 | 1 | View |
| Mercury 4-STROKE-EFI | 200r-hp-3-4l-v6-racing | 3B648748 UP | -, 5 | 1 | View |
| Mercury 4-STROKE-EFI | 225-hp-verado-6-cyl | 0P520553 THRU 2B144122 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 225-hp-verado-6-cyl | 1B517434 THRU 2B144122 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 225-hp-verado-6-cyl | 2B144123 THRU 2B578935 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 250-hp-verado-6-cyl | 0P520553 THRU 2B144122 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 250-hp-verado-6-cyl | 1B517434 THRU 2B144122 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 250-hp-verado-6-cyl | 2B144123 THRU 2B578935 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 250r-hp-4-6l-v8-racing | 1E080500 UP | -, 5 | 1 | View |
| Mercury 4-STROKE-EFI | 275-hp-verado-6-cyl | 0P520553 THRU 2B144122 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 275-hp-verado-6-cyl | 1B517434 THRU 2B144122 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 275-hp-verado-6-cyl | 2B144123 THRU 2B578935 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 300-hp-verado-6-cyl | 0P520553 THRU 2B144122 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 300-hp-verado-6-cyl | 1B517434 THRU 2B144122 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 300-hp-verado-6-cyl | 2B144123 THRU 2B578935 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 300-ros-hp-4-6l-v8-15-inch-midsection-racing | 1E054618 UP | -, 5 | 1 | View |
| Mercury 4-STROKE-EFI | 300r-hp-4-6l-v8-15-inch-midsection-racing | 1E054618 UP | -, 5 | 1 | View |
| Mercury 4-STROKE-EFI | 300r-hp-4-6l-v8-racing | 1E080500 UP | -, 5 | 1 | View |
| Mercury 4-STROKE-EFI | 350-hp-2-6l-l6-pro-verado | 2B141124 THRU 3B342962 | 25, 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 350-hp-2-6l-l6-verado | 2B141617 THRU 3B342962 | 25, 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 350-hp-sci-verado | 1B716557 THRU 2B143542 | 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 400-hp-2-6l-l6-verado | 2B618256 THRU 3B342962 | 25, 28, 8 | 1 | View |
| Mercury 4-STROKE-EFI | 400r-hp-2-6l-l6-racing | 2B141124 THRU 3B342962 | 25, 28, 8 | 1 | View |
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