Sierra 18-7081 Carburetor Kit OMC /Mercruiser/
Sierra 18-7081 Carburetor Kit OMC /Mercruiser/ — Product description
Revitalize Your Engine with the Sierra 18-7081 Carburetor Kit
Nothing frustrates a boater more than a sluggish engine on the water. If your OMC or Mercruiser outboard or stern drive is running rough, hesitating under load, or guzzling fuel inefficiently, the carburetor might be the culprit. Dust, ethanol-laced gas, and wear over time clog jets and erode seals, starving your engine of the precise fuel-air mix it craves. Enter the Sierra 18-7081 carburetor rebuild kit—a reliable fix that restores smooth idling, crisp throttle response, and peak performance without the hassle of sourcing a full replacement.
This kit targets common issues in Rochester-style 2-barrel carburetors found on many classic marine engines. Boaters swear by it for weekend warriors and serious anglers alike, turning weekend maintenance into a quick win that gets you back on the water faster.
Perfect Fit for OMC and Mercruiser Applications
Engineered as a direct aftermarket match, the Sierra 18-7081 slots right into popular setups:
- OMC Stern Drive and outboard models from the 1970s through 1980s with Rochester 2GC or 2GV carbs.
- Mercruiser inline 4-cylinder and V6 engines, especially 888 and 228 CID blocks paired with 2-barrel carbs.
- Compatible with carb numbers like 5-1705, 5-1715, and similar variants—always cross-check your carb tag for the best match.
It's a go-to for restoring that factory-fresh fueling on engines that power everything from fishing skiffs to family bowriders.
Kit Contents: Everything You Need for a Complete Rebuild
No piecing together parts from multiple sources. This comprehensive kit packs:
- Gaskets and diaphragms for airtight seals.
- Needles, seats, and jets precision-machined for optimal flow.
- Float assemblies and accelerator pump components.
- Choke and throttle valve hardware.
- All necessary O-rings, washers, and screws.
High-quality materials resist corrosion from saltwater exposure and modern fuels, ensuring longevity in harsh marine environments.
Key Benefits That Keep Boaters Coming Back
Why settle for subpar performance when a rebuild can deliver:
- Smoother Operation: Eliminates bogging, stumbling, and black smoke for effortless cruising.
- Fuel Savings: Proper metering cuts waste, stretching your tank further on long runs.
- Cost-Effective: Rebuild over replace—extend your engine's life without big bucks.
- Reliable Starts: Cold mornings? No problem with refreshed choke and idle circuits.
- Durable Design: Ethanol-resistant components handle today's gas blends better than originals.
Users report engines firing up on the first pull and holding RPMs steady, even after trailering through summer heat.
Step-by-Step Installation Tips for DIY Success
Tackle the job in your driveway with basic tools—no shop required. Here's a boater-proven approach:
- Disconnect fuel lines and throttle linkages; label everything for reassembly.
- Remove the carburetor bowl and note float height settings.
- Clean all passages with carb cleaner—avoid wire brushes on soft parts.
- Swap in new components, lubricating O-rings lightly with marine grease.
- Reinstall, adjust idle mixture screws (start at 1.5 turns out), and test on the water.
Pro tip: Change your fuel filter and add a stabilizer beforehand to prevent repeat clogs. Most jobs wrap up in under two hours.
Long-Term Maintenance to Maximize Kit Performance
A rebuild is your fresh start—keep it humming with these habits:
- Run the engine weekly to circulate fuel and prevent varnish buildup.
- Winterize with fogging oil and stabilized gas.
- Inspect linkages seasonally for wear.
- Use ethanol-free fuel when possible for coastal boats.
With proper care, expect years of trouble-free service from your Sierra-rebuilt carb.
Why Trust Sierra for Your Marine Engine Parts?
Sierra stands out in the aftermarket world for precision engineering that mirrors OEM specs, backed by decades of marine expertise. Boat yards and DIYers alike choose Sierra for consistent quality that withstands the pounding of waves and engines. It's not just a kit—it's peace of mind on every outing.
Frequently Asked Questions
What engines is the Sierra 18-7081 carburetor kit compatible with?
It's designed for OMC stern drives, outboards, and Mercruiser inline 4-cylinder and V6 engines using Rochester 2-barrel carburetors, such as those with carb numbers 5-1705 or 5-1715. Verify your carb model for exact fit.
Does this kit include all gaskets needed for a full rebuild?
Yes, it comes complete with gaskets, diaphragms, jets, needles, floats, and more—everything for a thorough overhaul.
How long does installation typically take?
Most experienced DIYers finish in 1-2 hours with basic tools. First-timers might add time for cleaning.
Will this kit work with ethanol-blended fuels?
Absolutely. Components are ethanol-resistant, making it ideal for modern pump gas.
Can I use this on my older Mercruiser V8?
Primarily for 4-cylinder and smaller V6 setups with 2-barrel carbs. For V8s, check specific carb compatibility.
What if my carburetor is heavily worn?
This kit refreshes internals beautifully, but severely pitted castings might need professional machining.
Does rebuilding improve fuel economy?
Yes, restoring proper metering often yields noticeable MPG gains, especially if it was running rich before.
SKU: NVN-4002952
MPN: 18-7081
UPC: 030999321053
Technical specifications
| Brand | Sierra Engine Parts |
| Model | Sierra 18-7081 Carburetor Kit OMC /Mercruiser/ |
| SKU / MFR# | 4002952 |
Set product metafields under specs.* to populate this table.
Frequently asked questions
No questions yet. Got one? Drop us a line.
