YAMAHA 20 to 30 hp propeller 37950264

Propeller for Yamaha outboard motors

Technical specifications

• 3 aluminum blades
• Right-hand rotation
• 10 hub splines F
• White paint resistant to harsh environments

Compatibility: Yamaha 2-stroke and 4-stroke engines

• 2-stroke: 20C / 20D / 25B / 25D / 25N / 25V / 30A / 30D / 30G / 30H
• 4-stroke: F25A / F25D / F25G

Compatible dimensions and references

• 9-7/8 x 9 equivalent to 664-45941-01-00
• 9-7/8 x 10-1/2 equivalent to 664-45945-00-00
• 9-7/8 x 11-1/4 equivalent to 664-45947-01-00
• 9-7/8 x 12 equivalent to 664-45954-01-00
• 9-7/8 x 13 equivalent to 664-45949-02-00

How do I choose the right propeller pitch for my engine?

Choosing the right propeller pitch for your outboard motor is crucial for optimal performance, fuel consumption, and maneuverability.

The pitch represents the distance the propeller would travel in one revolution in the water, and it must be adapted to the power of the engine as well as the intended use (cruising, fast navigation, or towing). In general, a shorter pitch (e.g., 9-11) provides better acceleration and greater thrust with higher engine speed at low speeds. Conversely, a longer pitch (e.g., 12-14) increases top speed and reduces fuel consumption at cruising speed, which is suitable for long voyages.

To refine your choice, you need to take into account the total weight on board, the type of hull (planing or displacement) and local conditions (wind, current). A practical test is to compare the engine speed indicated on the tachometer at full throttle: it should remain within the range recommended by the manufacturer (often between 5500 and 6000 rpm). If the speed exceeds this range significantly, a larger pitch should be chosen; if the speed remains too low and the boat struggles to get going, a smaller pitch will be more suitable.