Aluminum Propeller 8.5x7.5R for 6-9.9HP Engines (3-Blade RH)

This 8.5x7.5 aluminum propeller is designed to enhance the performance of outboard engines ranging from 6 to 9.9 HP. With its larger diameter (8.5″) and moderate pitch (7.5″), the prop offers excellent “bite” in the water, helping the boat gain speed quickly. That makes it an ideal choice for small fishing boats and RIB inflatables around 3.5 – 4.5 m in length, powered by 8–10 HP motors, where steady acceleration and handling are crucial. The propeller ensures the engine won’t bog down during takeoff by keeping it in the optimal RPM range under load.

The aluminum construction of the prop is lightweight yet strong, with a protective coating to ward off corrosion in both marine and freshwater environments. This translates to a longer service life and less worry about rust-related damage. The prop fits a standard 7-spline shaft – a configuration found on many Yamaha, Parsun, and Selva models in this category. That means you can easily replace your original prop without special tools. In turn, your boat gains improved dynamics and reliability with just a simple swap.

• Ideal Applications: Suited for small to mid-sized boats (around 3.5 – 4.5 m) powered by 6-10 HP engines. With this propeller, your boat will accelerate confidently even when carrying fishing gear or a few passengers, which is important for angling trips and leisure cruising.
• Recommended For: Boaters who notice their 8-10 HP engine struggling under heavier loads or during takeoff. The 8.5x7.5 prop helps maintain the engine’s proper operating range when loaded, providing better thrust at low and mid speeds.
• Comparison: If your boat is very light and easily hits high RPM, an alternative prop with more pitch (e.g., 9″) might increase top speed. However, the 7.5″ pitch of this propeller is perfect when extra power and control are needed – for example, running against a current or in choppy water.
• Compatibility: This prop is a direct replacement for OEM propellers on Yamaha 6-8 HP outboards (orig. code 6G1-45943-00) and also works with equivalent Parsun and Selva models. Thanks to the universal 7-spline hub, it’s compatible with other brands using the same standard, making it a versatile choice for various engines.