Sierra 18-7237 986799 986784 OMC I/O Carburetor Kit

Rejuvenate Your OMC I/O Engine with Reliable Carburetor Performance

Keeping your OMC inboard/outboard engine running smoothly starts with a properly tuned carburetor. Over time, wear from fuel residues, ethanol blends, and constant marine exposure can lead to rough idling, hesitation under load, or outright stalling. This carburetor kit steps in as a direct, no-fuss replacement, engineered to restore factory-level fuel delivery and throttle response. Boat enthusiasts swear by it for weekend warriors and hard-working fishing rigs alike, breathing new life into engines that have seen better days without the hassle of sourcing rare OEM parts.

What sets this kit apart is its focus on real-world durability. Gaskets resist cracking in humid bilge environments, jets are precision-machined for consistent atomization, and needles deliver spot-on metering across RPM ranges. Whether you're dialing in a classic Cobra or a later-model stern drive, expect crisp acceleration and better fuel economy once dialed in.

Perfect Fit for Popular OMC Stern Drive Models

Designed as a drop-in solution for a range of OMC I/O setups, this kit matches the specifications of common factory carburetors. It supports engines from the Stringer series through to V8 powerplants in 3.0L to 7.5L displacements, ensuring broad compatibility across boat hulls from runabouts to larger cruisers. Always cross-check your engine's serial number plate for exact fitment, as OMC varied carbs by year and horsepower rating. Pro tip: Pair it with fresh fuel lines and a rebuilt fuel pump for peak reliability during long hauls.

• Targets OMC Stringer, Viking, and Cobra drive systems
• Suits 4-cylinder and V6/V8 configurations
• Ideal for freshwater and saltwater applications

Complete Kit Contents for a Thorough Rebuild

Don't settle for partial fixes—this kit packs everything needed for a full overhaul. From accelerator pumps to idle circuits, every component is included to eliminate guesswork. Float levels are pre-set for easy bench assembly, and all soft goods like diaphragms are crafted from ethanol-resistant materials to fend off modern fuel woes.

"Swapped this in on my '85 5.0L over a weekend—idles like new and sips gas better than before." – Marine mechanic feedback from forum threads.

Key inclusions: Rebuild gaskets, needle and seat assemblies, jets (main and idle), power valve, and linkage hardware. It's comprehensive enough for DIYers yet trusted by pros for shop efficiency.

Step-by-Step Installation Tips for Flawless Results

Installing this kit is straightforward with basic tools: screwdrivers, carb cleaner, and a rebuild stand. Start by draining the fuel system and removing the old carb—note linkage positions for reassembly. Clean mating surfaces meticulously to prevent vacuum leaks, then torque the mounting bolts to spec (usually 10-12 ft-lbs). Adjust the float height to 1/16-inch drop and set initial idle mixture with a vacuum gauge for smooth low-end operation. Sea trial tuning fine-tunes high-speed performance; expect 30-60 minutes total time for experienced hands.

1. Disconnect battery and fuel lines
2. Disassemble and clean base plate
3. Install new components per diagram
4. Bench test for leaks before mounting
5. Sync throttles if twin-carb setup

Common pitfall: Overlooking the choke pull-off. Ensure it's free-moving to avoid cold-start floods.

Long-Term Maintenance to Maximize Engine Life

Post-install, treat your carb right with stabilized fuel and annual inspections. Check for gummed jets every off-season— a quick spray with carb-specific cleaner keeps things responsive. In salty environments, rinse linkages with freshwater after use. This approach extends service intervals, saving you from roadside tows or dockside headaches.

Why Boat Owners Choose This Sierra Kit Over Alternatives

Sierra's reputation shines in aftermarket marine circles for matching or exceeding OEM tolerances at a fraction of the wait time. No brittle plastics here—just robust brass and Viton seals built for abuse. It's a staple for restorers chasing authenticity and racers needing repeatable performance. Backed by rigorous testing on dynos and open water, it delivers confidence lap after lap.

Frequently Asked Questions