1. Technical Specifications

2. Key Features & Functionality

• Speed-Optimized Pitch Geometry: The 8-inch pitch configuration is tailored for lightweight inflatables (SIBs), tenders, and small dinghies carrying light loads, enabling the engine to achieve higher top-end speeds.

• Torsional Cushion Rubber Hub Protection: The internal pressed-in rubber bushing absorbs shifting shock and slips during underwater collisions with shallow rocks or river beds, preventing bent propshafts or broken gear teeth.

• Marine Corrosion Protection: Coated with Yamaha's factory-grade electrostatic white/gray powder coat, providing durable defense against blistering, salt spray oxidation, and galvanic corrosion.

• Precision Dynamic Balancing: Manufactured to close dynamic balance tolerances, minimizing tiller handle vibration and stern shuddering at full throttle.

3. Compatible Models

Primarily compatible with portable Yamaha outboards equipped with a 9-tooth splined propeller shaft:

• Yamaha 2-Stroke Series: 4HP (4A, 4AC, 4AS), 5HP (5C, 5CS) platforms

• Yamaha 4-Stroke Series: F4A, F4B, F5A, F6C (select early-generation 9-spline shaft variants)

• Clone Engines: Compatible with Parsun (T4 / T5 / F4 / F5), Hidea (HD4 / HD5), Powertec, Seapro, and other portable outboard brands utilizing the Yamaha 6E0 gearcase architecture

4. Aftermarket & Brand Compatibility

• OEM Brand Fitment:

• Yamaha Marine: Engineered for genuine Yamaha 4HP and 5HP (BA-Series 9-tooth spline) portable lower unit propulsion systems.

• Industry Interchange References:

• Solas Propellers: Amita 3 Series 3111-075-08

• Turning Point / Michigan Wheel: Equivalent 9-spline portable 7.5x8 series

• PREMARINE Brand Aftermarket Replacement:

• PREMARINE Quality Standard: PREMARINE specializes in marine aluminum and stainless steel propellers, hardware kits, and small gearcase components. This propeller is produced using high-pressure vacuum casting and multi-axis dynamic balancing.

• Direct OEM-Level Performance: Blade contouring, pitch consistency, and rubber hub torque-slip thresholds match or exceed OEM specifications, serving as the premier cost-effective choice for replacement or emergency spare propulsion.

5. Common Symptoms & Troubleshooting

• Engine Revs Up Rapidly While Boat Loses Forward Thrust (Spun Hub Syndrome):

• Cause: Inner rubber hub delamination resulting from ground strikes or running through thick underwater weeds under load.

• Troubleshooting: Draw an alignment mark across the inner brass spline core and outer aluminum casting; test-run under load. If the marks misalign, the rubber hub has spun and the propeller must be replaced.

• Severe Tiller Handle Shaking / Hull Vibration Underway:

• Cause: Dented, bent, or chipped blade edges disrupting rotational balance.

• Troubleshooting: Inspect all 3 blades for deformation or missing material; running an unbalanced propeller on small portable outboards will quickly ruin propshaft seals and lower carrier bearings.

• Engine Bogs Down / Unable to Reach Planing Speeds Under Heavy Load:

• Cause: The 8-inch pitch is too aggressive when carrying passengers or heavy fishing gear (over-propped condition).

• Troubleshooting: If operating with heavy payloads, drop down to a lower pitch propeller 7-1/2*8-BA to regain engine RPM and thrust.

OEM Part Numbers

Compatible OEM references include:

6E0-45941-01-EL

6E0-45941-01-00

Compatible Engine Models

This Propeller is primarily designed for:

2-Stroke 4/5HP

4-Stroke 4/5/6HP

If you are unsure about compatibility, please provide your engine model number or identification plate for verification before ordering.

Applications

This Propeller is commonly used for:

Outboard engine repair

Engine rebuilding projects

Marine maintenance workshops

Boat fleet maintenance

Commercial fishing vessels

Recreational boats

Marine spare parts distribution