Sierra 18-3250 Impeller (Honda)91210-Zx1B02

Why Your Honda Outboard Needs a Reliable Impeller Like the Sierra 18-3250

Picture this: you're out on the water, engine humming smoothly, when suddenly the cooling system falters. Overheating is every boater's nightmare, and it often traces back to a worn-out impeller. The Sierra 18-3250 steps in as a trusted replacement for the Honda OEM part 91210-ZX1B02, engineered to keep your outboard's water pump pumping efficiently. Crafted from durable neoprene rubber, this six-vane impeller delivers precise fit and peak performance, restoring optimal coolant flow without the premium price tag of genuine parts.

Boat owners swear by Sierra for its balance of quality and affordability. Unlike flimsy generics that shred after a season, this impeller withstands the rigors of saltwater exposure, debris, and high RPMs, extending the life of your Honda engine.

Key Features That Set the Sierra 18-3250 Apart

• Exact OEM Match: Mirrors the dimensions and vane configuration of Honda 91210-ZX1B02 for seamless drop-in installation.
• High-Quality Neoprene Construction: Resists swelling, cracking, and degradation from ethanol fuels, heat, and marine environments.
• Six-Vane Design: Ensures consistent water flow at all speeds, preventing cavitation and overheating.
• Precision Molded: Eliminates balance issues that cause vibrations or premature wear on pump housing.
• Universal Sierra Reliability: Backed by decades of marine aftermarket expertise, trusted by mechanics and weekend warriors alike.

These aren't just specs—they translate to fewer breakdowns, smoother runs, and more time enjoying the water instead of troubleshooting.

Perfect Fit for Popular Honda Outboard Models

The Sierra 18-3250 is tailored for a range of Honda four-stroke outboards, making it a go-to for maintenance on models from compact tillers to mid-range powerhouses. It slots right into water pumps on engines like the BF40 through BF115 series, where the factory impeller starts to falter after 100-200 hours of use. Always cross-check your service manual for exact fitment, but this impeller has proven itself across various shaft lengths and gearcases.

Pro tip: If you're servicing a twin-cylinder BF50 or a V4 BF90, pair this with a fresh pump kit for comprehensive protection—impellers don't last forever in harsh conditions.

Effortless Installation: DIY in Under an Hour

Swapping impellers is a rite of passage for any outboard owner. With basic tools—a socket set, flathead screwdriver, and needle-nose pliers—you can replace your old unit without pulling the boat. Here's a streamlined guide:

1. Disconnect the fuel line and run the engine dry to drain the pump.
2. Remove the lower unit bolts and slide it down carefully.
3. Pry out the old impeller using pliers, noting the keyway orientation.
4. Lube the new Sierra 18-3250 with marine grease, align the vanes, and press it onto the pump shaft.
5. Reassemble, prime the pump, and test-flush on the hose before launch.

Twist the impeller clockwise during install to flex the vanes outward for a snug fit. Common pitfalls? Skipping lube (causes binding) or ignoring wear on the pump housing—inspect that too for grooves or scoring.

Maintenance Tips to Maximize Impeller Lifespan

To get seasons out of your Sierra 18-3250, inspect it annually or every 100 hours. Signs of trouble include rubber chunks in the tell-tale stream, reduced pee stream, or engine temps creeping up. Flush after every saltwater trip, store dry during off-season, and avoid dry-running the pump longer than 30 seconds.

"I've run Sierra impellers on three Honda outboards over 10 years—no failures, even in brackish bays." – Experienced charter captain

Regular care prevents the vicious cycle of overheating leading to warped heads or seized pistons. Invest time now, save thousands later.

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