Propeller SOLAS: 9-1/4 x 10: Evinrude/Johnson 9.9-15 HP 2-stroke 1974-

When choosing the right propeller, it's important to consider the engine manufacturer's maximum RPMs. A general guideline is 4500-5500 RPM for 2-stroke engines and 5000-6000 RPM for 4-stroke engines. A 1-inch change in pitch raises/lowers the engine's maximum RPMs by about 200-300 RPM. The size of the propeller is indicated as 10.3 x 12, where the last number 12 refers to pitch. Features: 9-1/4 x 10 (9.25 x 10) Number of blades: 3 13 spline holes Compatibility includes: Evinrude, Johnson 9.9-15 hp 2-stroke from 1974 onwards Replaces original numbers: OMC/Johnson/Evinrude: 174950, 778772