Aluminum Propellers for 4–9.9 HP Tohatsu Outboard Boat Motor

Choosing the right aluminum propeller for your Tohatsu outboard can make all the difference in acceleration, top speed, and fuel efficiency. Whether you’re cruising a calm lake or pushing through choppy waters, having a propeller that matches your engine’s power and design is essential. Below, we dive into a detailed breakdown of our precision-cast aluminum propellers engineered for 2.5–3.5 HP, 4–6 HP, and 8–9.9 HP Tohatsu outboards. Please note: we are an independent supplier—our products fit Yamaha, Mercury, Suzuki, Volvo Penta, Honda, and Tohatsu engines, but we aren’t affiliated with those manufacturers.

Why Choose Aftermarket Aluminum Propellers?

Upgrading to a high-quality aluminum prop is an affordable way to enhance performance without breaking the bank. Our blades are cast from marine-grade aluminum alloy, polished to a smooth finish, then balanced to tight tolerances. The result is a propeller that resists corrosion, delivers crisp throttle response, and minimizes vibration across the entire rev range.

1. Propellers for 2.5–3.5 HP Outboards

Designed for the lighter end of the spectrum—ideal for small tenders, jon boats, and inflatable hulls—the 2.5/3.5 A2 (2-stroke) and MFS25B/3.5B (4-stroke) propellers deliver nimble acceleration and reliable thrust.

• Blade count: 3

• Material: Marine-grade aluminum

• Spline: 9-tooth hub

These compact three-blade props help small motors get on plane quickly, even with minimal horsepower. The slightly larger 7⅜×5³⁄₈ model excels at low-load cruising, while the 7¼×6 offers a touch more stability under bow-up acceleration.

2. Propellers for 4–6 HP Outboards

The sweet spot for portable powerboats, our 4–6 HP propellers accommodate both 2-stroke and 4-stroke Tohatsu engines. Featuring a 12-spline hub, these props balance agility and load-carrying capacity.

• Available options: 3-blade and 4-blade configurations

• Hub compatibility: 12-spline shaft

• Performance tip: Lower pitch (5–6 inches) helps with heavy loads or steep climbs, while higher pitch (8–9 inches) enhances top-end speed.

Whether you’re skiing, tubing, or just towing gear, match the pitch to your typical load for the smoothest ride and optimal fuel consumption.

3. Propellers for 8–9.9 HP Outboards

For larger skiffs and inflatable pontoons, these propellers are tuned to 8 and 9.8 HP four-stroke motors built from 2005 onward. A 12-spline hub ensures a secure fit on Tohatsu’s modern drive shafts.

• Blade count: Available in 3-blade and 4-blade styles

• Robust design: Thick leading edges for impact resistance

• Versatility: Covers a broad pitch range—select a lower pitch for quick planing, or go high for sustained cruising speeds.

Selecting the Perfect Pitch and Diameter

1. Low Pitch (5–7 inches): Rapid throttle response, better hole-shot, ideal for heavier loads or steep wakes.

2. Mid Pitch (7.5–8.5 inches): Balanced acceleration and top-end speed—great for general recreational use.

3. High Pitch (9–9.5 inches): Maximizes top speed under moderate loads; less favorable for heavy towing.

Quick Tips

• Test incrementally: Swap in a half-inch pitch change to feel the difference.

• Monitor RPM: Your engine’s sweet spot often sits around 5,000–6,000 RPM at wide-open throttle—choose a prop that keeps you in that band.

• Consider blade count: More blades increase grip in water but slightly reduce top speed.

Conclusion

Our precision aluminum propellers for 2.5–9.9 HP Tohatsu outboards offer unmatched value, reliable performance, and a customized fit for a variety of recreational boating activities. They fit popular Yamaha, Mercury, Suzuki, Honda, Volvo Penta, and Tohatsu engines without pretending to be OEM. Invest in the right propeller today, and experience responsive acceleration, smooth cruising, and lasting durability on every outing!