Mercury Mariner Yamaha 40-140HP Outboard Propeller 12.5 x 21 4-Blade RH Aluminium Solas 1413-125-21
SOL1413-125-21
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Solas Amita 4 Propeller 1413-125-21
Aluminium 12.5" x 21" 4-Blade Right Hand Propeller
The Amita 4 12.5" × 21" is a 4-blade right-hand aluminium propeller for Mercury Mariner Yamaha 40-140HP outboard engines (4 1/4" gearcase), Solas part 1413-125-21. For this engine we list 3 pitches from 13" to 21". 21" is the highest pitch in the range – maximum top speed for light, fast hulls running lightly loaded.
Key Features
- ✔ Pressed-in rubber hub – no hub kit needed
- ✔ Thru-hub exhaust for optimal flow
- ✔ 4-blade aluminium design for extra grip and hole-shot
- ✔ Anti-corrosion paint finish
Technical Specs
| Diameter: | 12.5" |
| Pitch: | 21" |
| Blades: | 4 |
| Rotation: | Right Hand (RH) |
| Gearcase / Drive: | 4 1/4" |
| Material: | Aluminium |
| Solas Part No.: | 1413-125-21 |
Is 21" the Right Pitch for Your Boat?
A 21" pitch means this propeller would, in theory, move the boat 21" forward for every full turn. The right pitch lets your Mercury Mariner Yamaha 40-140HP outboard reach the full-throttle RPM range given in its owner's manual with a normal load on board.
- ✔ Engine over-revs at full throttle? Go up in pitch.
- ✔ Engine can't reach its rated RPM, or the boat is slow to plane? Go down in pitch – the next size down for this engine is 15".
- ✔ Rule of thumb: a change of 1" in pitch moves full-throttle engine speed by roughly 150–200 RPM.
Other pitches for your Mercury Mariner Yamaha 40-140HP outboard:
- 13" pitch (13.3" diameter) – the lowest pitch in the range – maximum thrust for heavily loaded boats, pontoons, workboats or towing.
- 15" pitch (13" diameter) – a mid-range pitch – balanced all-round performance and the usual starting point.
Compatibility / Fitment Guide
| Make/System | Model/Application | Notes |
|---|---|---|
| Mercury | 40-140 HP – 4 1/4" gearcase | Match your current propeller size |
| Mariner | 40-140 HP – 4 1/4" gearcase | Match your current propeller size |
| Force | 40-140 HP – 4 1/4" gearcase | Match your current propeller size |
| Yamaha | 40-140 HP – 4 1/4" gearcase | Match your current propeller size |
OEM Cross Reference
| Solas | 1413-125-21 |
Questions & Answers
Will this propeller fit my Mercury Mariner Yamaha 40-140HP outboard?
It fits Mercury Mariner Yamaha 40-140HP outboard engines with a 4 1/4" gearcase. Check the fitment table above and compare the size stamped on your current propeller (12.5" × 21") before ordering.
Should I choose 21" or a different pitch?
Keep the same pitch as your current propeller if the engine reaches its rated full-throttle RPM. If it struggles to reach rated RPM, 15" is the next step down.
Is this a genuine original part?
This is a genuine Solas propeller – a premium aftermarket replacement made to meet or exceed original equipment (OE) fitment and performance.
How do I know if it is compatible?
Check the Solas part number (1413-125-21) or OEM number on your current propeller, plus your gearcase size and spline count. If you are unsure, send us your engine make, model and year and we will confirm fitment before you order.
Does this propeller require a separate hub kit?
No. This propeller has a traditional pressed-in rubber hub and fits straight onto your propeller shaft with your existing thrust washer and nut.
Note: Please verify your engine's gearcase size, spline count and propeller size against the references above before purchasing. Domain: 4boats.co.uk
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