Sierra 18-7739 Carburetor Repair Kit (Yamaha )

Revive Your Yamaha Outboard with Precision Rebuild Components

Nothing frustrates a day on the water like a sputtering engine from a gummed-up carburetor. Dirt, ethanol in modern fuels, and time take their toll on these vital components, leading to rough idling, hesitation under load, or outright failure to start. That's where a reliable rebuild kit steps in, restoring smooth performance without the hassle of sourcing individual parts.

This kit delivers all the essentials for a thorough overhaul, meticulously matched to Yamaha's demanding specs. Think gaskets, diaphragms, needle valves, and seals crafted from durable materials that stand up to saltwater exposure and constant vibration. Boaters who've tackled the job themselves rave about the difference—crisper throttle response and that satisfying hum of a well-tuned powerhead.

Perfect Fit for Popular Yamaha Models

Engineered for seamless integration, it covers a range of mid-range Yamaha two-stroke outboards commonly found on everything from fishing skiffs to family runabouts. Compatibility spans models like the 40HP through 60HP variants from the late '80s onward, where large carbs handle the fuel-air mix for those reliable workhorses. Always cross-check your carburetor markings to confirm, as variations exist across years and horsepower ratings.

• Targets primary carbs on multi-carb setups
• Ideal for freshwater or saltwater environments
• Replaces worn OEM parts prone to cracking or swelling

What's Inside: A Complete Rebuild Arsenal

Unlike partial kits that leave you hunting for extras, this one packs everything needed for one carburetor:

• Float bowl gasket and O-rings for leak-free sealing
• Needle and seat assembly to prevent overflows
• Pump diaphragms for consistent fuel delivery
• Main jet, pilot jet, and screen for optimized metering
• Assortment of seals and washers to handle high-pressure zones

High-quality rubbers resist ethanol damage, a common killer in today's pump gas, extending the life between services.

DIY Overhaul Tips from Seasoned Mechanics

Tackling a carb rebuild isn't rocket science, but a few tricks make it foolproof. Start with a clean workspace and ultrasonic cleaner if possible—ultrasonics blast away varnish like nothing else. Disassemble methodically, noting orientations (snap photos!). Soak metal parts in carb cleaner overnight, then blow dry with compressed air to avoid hidden moisture.

Pro tip: Test float height and needle valve drop before reassembly; even tiny deviations cause lean or rich conditions. Adjust idle mixture screws during break-in on the water, listening for that sweet spot where it transitions smoothly. Expect 30-60 minutes per carb once you're practiced, and always sync multiples on multi-carb engines for balanced power.

"Swapped this kit into my '92 50HP after winter storage woes. Runs like new—zero bogging at WOT now." – Experienced trailered boater

Regular maintenance like fuel stabilizers and drain plugs pulled prevent repeat issues, keeping adventures uninterrupted.

Why Choose This Kit Over Stock Replacements?

Aftermarket excellence meets OEM reliability at a fraction of dealer costs. Sierra's reputation in marine circles stems from rigorous testing—parts that don't just fit, but perform under real-world abuse. Ethanol-resistant materials mean fewer repeat teardowns, and the kit's organization speeds up the job. Boaters prioritize it for its balance of affordability and longevity, especially on high-hour engines.