Piranha Propellers Performance Kit A-Series 4-Blade | 4.5" Gearcase 120–260HP I/O & 150–250HP OB

Piranha Propellers Performance Kit A-Series 4-Blade — Complete On-Water Backup + Hydrofoil Performance Upgrade for 4.5" Gearcase 120–260HP I/O & 150–250HP OB

The Piranha A-Series 4-Blade Performance Kit gives you two full blade sets, a complete hub kit, a floating prop wrench, a self-draining gear bag, and a Piranha Hydrofoil Stabilizer — everything you need for a field blade swap in minutes and a real, bolt-on performance upgrade every time you're on the water. Faster plane. Better lift under load. And if you take a blade strike, you're back running without a tow.

Backed by a lifetime hub assembly guarantee and proudly Made in the USA.

Part Specifications

• Application: 4.5" Gearcase Diameter — 120–260HP I/O | 150–250HP OB
• Blade Configuration: 4-Blade, Right Hand (LH variants available — see blade size selector)
• Blade Material: High-strength aerospace composite
• Hub Core: Aluminum core over-molded with aerospace composite
• Technology: HydroBites precision ridges (hole shot, vibration, ventilation control)
• Guarantee: Lifetime hub assembly guarantee

Kit Includes:

• 1 × Piranha Propellers Hub Kit
• 2 × Piranha Propellers Blade Sets
• 1 × Piranha Propellers Floating Prop Wrench Kit
• 1 × Piranha Propellers Self-Draining Gear Bag
• 1 × Piranha Propellers Hydrofoil Stabilizer

A complete Piranha Propeller consists of the Hub, 4 Blades, and the Cap.

The Hydrofoil Advantage

The Piranha Hydrofoil Stabilizer bolts directly to the anti-ventilation plate on your drive — no drilling, no permanent modifications. Once installed, it generates hydrodynamic lift at the stern, delivering:

• Faster plane — up on plane quicker, usually at a lower speed
• Better performance under load — especially useful when running heavily loaded or towing skiers
• Improved fuel efficiency — less time at high throttle getting on plane means less fuel burned
• Reduced porpoising — smoother ride in choppy conditions

Why the Performance Kit Beats a Spare Prop

Two full blade sets plus a floating prop wrench and self-draining gear bag means a complete field repair in under 5 minutes on the water. Since you can't break more blades than are on the prop, two full sets covers any realistic strike scenario while keeping your propeller properly balanced and at the correct pitch.

Why A-Series 4-Blade Outperforms Standard Aluminum Props

• HydroBites technology — precision ridges improve hole shot, reduce vibration, and control ventilation in tight turns
• Shock-absorbing blade design — absorbs prop-strike impact and protects your lower unit, gears, and prop shaft
• Aluminum-core center hub over-molded with high-strength aerospace composite
• Stronger than aluminum — outlasts traditional metal props in salt and fresh water
• Corrosion-resistant — no rust, no pitting, season after season
• Repair or re-pitch in minutes — no special tools required
• Saves on repair costs — replace only the blade, not the entire propeller
• Made in the USA — lifetime hub assembly guarantee included

Installation Notes

• Hydrofoil Stabilizer bolts to anti-ventilation plate — no drilling, no permanent modification required; approximately 15–30 minutes with basic hand tools, fully removable
• Blade swap: field-replaceable in under 5 minutes on the water with the included floating prop wrench
• Volvo Penta: Fits long-shaft models only — confirm shaft length before ordering
• Volvo Penta: Check outdrive rotation direction before ordering — left-hand (LH) blade variants are available in the selector above
• Confirm 4.5" gearcase diameter fitment for your specific engine make, model, and year before ordering
• Always carry both blade sets on board — propeller balance and pitch depend on using matched blades

Additional Information

• Vendor: Piranha Propellers
• SKU: PERFMKITA-4B (base)
• Product Type: Piranha Performance Kit
• Country of Origin: USA
• HS Code: 8487.90 (propeller parts and accessories — verify for your import classification)

Frequently Asked Questions

Q: What’s the difference between the A-Series Performance Kit and the A-Series Propulsion Kit?
A: Both kits include the same hub kit, two blade sets, floating prop wrench, and self-draining gear bag. The Performance Kit adds a Piranha Hydrofoil Stabilizer — a bolt-on device that mounts to your anti-ventilation plate and generates stern lift for faster planing and better efficiency under load. If you want both the backup system and a performance upgrade, the Performance Kit is the better choice.

Q: What’s the difference between the A-Series and B-Series 4-Blade kits?
A: The A-Series and B-Series designate different gearcase diameter families. The A-Series is for 4.5" gearcase applications (120–260HP I/O, 150–250HP OB). The B-Series targets a different gearcase diameter. Confirm your gearcase diameter before selecting a kit — hub assemblies are not interchangeable between series.

Q: I have a Volvo Penta outdrive. What do I need to check before ordering?
A: Two things — shaft length and rotation direction. The A-Series 4-Blade fits Volvo Penta long-shaft models only; short-shaft models are not compatible. Additionally, Volvo Penta outdrives may be right-hand or left-hand rotation — confirm your outdrive rotation before selecting a blade variant, as left-hand (LH) blade sets are available separately in the size selector.

Q: Why does the kit include two blade sets instead of one?
A: One blade set gets you back on the water after a strike — two sets keep you there for the rest of the season. Two full sets ensure your propeller stays properly balanced and at the correct pitch no matter what happens.

Q: How does Piranha composite compare to a standard aluminum propeller?
A: Piranha’s aerospace-grade composite is stronger than aluminum, lighter, and completely corrosion-resistant. When an aluminum prop gets damaged, you replace the whole thing. With Piranha, you replace only the damaged blade — in minutes, on the water — at a fraction of the cost.