2005 Cobalt 343 Boat in Bellevue, WA 98006 US
Built in 2005
343
2 Engines (2x MerCruiser)
35 feet
Gas
Fiberglass/Reinforced
The Cobalt 343 is one of the most capable performance cruisers ever built in this segment. Kevlar reinforced hull, twin big-block power, and a layout that works equally well at the dock or wide open. This example has 184 original hours, freshwater use only, and a service history that reflects an owner who maintained it properly.
Specs
LOA: 37 ft | Beam: 9 ft 8 in | Draft: 3 ft 1 in
Hull: Kevlar Reinforced Fiberglass, Deep Vee
Deadrise at Transom: 24.5 degrees
Fuel Capacity: 200 gal | Water: 10 gal
Engine: Twin Mercury 496 MAG HO, Bravo One Drives
HP: 425 HP each | 850 HP combined
Engine Hours: 184 original
Dry Weight: 11,065 lbs
Service and Upgrades
New Aquamarine flooring (May 2023)
Major service completed at 170 hours (April 2023)
New batteries (June 2024)
Maintained exclusively by Seattle Boat maintenance team
Always winterized, freshwater use only
Standard Equipment Highlights
Captains Call exhaust, twin engine
Docking lights, stainless steel
Electric porcelain head with macerator
Teak swim platform
Transom shower
Shore power 220V international
Air conditioning and heating
Double wide helm seat
Cockpit tonneau cover
Radar arch with portal lights
Concealed boarding ladder
Vacuflush head
Premium sound system with amplifier and subwoofer
V-berth with filler cushion
Fiberglass waterline, chain and anchor
Notable
Transferable slip lease available at Seattle Boat Marina, Bellevue/Newport
No deferred maintenance
Turn-key condition
Sea trial welcome. Survey encouraged. Located at Seattle Boat Marina, Bellevue, WA. Viewing by appointment.
Price History
| Date | Event | Price |
|---|---|---|
| 7/10/26 | Initial price | $89,000 |
2005 Cobalt 343 Video Tours
Cobalt 343: BoatTEST Review
Overview
Cobalt has long been recognized for producing world-class sport boats, though it has not been widely known in the high-performance segment—until now. The Cobalt 343 represents a significant advancement for the brand, emerging from three years of dedicated research and development. This model is designed to combine high-performance capabilities with the luxury and attention to detail that Cobalt is known for, aiming to deliver an exhilarating and refined boating experience.
Exterior Design and Deck Features
The Cobalt 343 features a thoughtfully designed exterior that prioritizes both performance and comfort. Wide side decks facilitate easy movement around the boat, while a fender locker equipped with gas-assisted lifts provides convenient storage. The deck layout includes two individual sun pads and two stern benches separated by a spacious walk-through, with double-hinged seats offering ample storage beneath. Practical amenities such as an inflator for water toys and a tool kit are integrated into the port bench compartment, which also houses battery switches, main breakers, and canvas pole storage. The two-level transom and swim platform provide close access to the water, protected by a wraparound stainless steel bar that serves as a handhold and dock guard. A dive-style ladder deploys effortlessly via a lever, and stainless steel vents and fins ensure fresh air circulation to the engine compartment. Additional features include a swim shower and water hookup located in the starboard compartment.
Interior Living Spaces
Inside the cabin, the Cobalt 343 offers a level of refinement more commonly found on mega-yachts or aircraft. The cabin door is a solid, non-sliding design that opens to reveal a port-to-starboard V-shaped bench seating area. A flat-panel television is mounted in one corner, providing entertainment options for evening relaxation. The enclosed head includes a port-a-potty, sink, and vanity, ensuring privacy and convenience. At the stern, rear-facing bench seats create a spacious conversation area, with the double-hinged seating providing cavernous storage below.
Helm and Controls
The helm station of the 343 is designed with a futuristic, cockpit-like layout. To the left of the helm, a bank of rocker switches is complemented by two rows of gauges, including water and air temperature indicators as well as digital depth gauges. The helm features Gaffrig instrumentation and LaVorsi precision engine controls, allowing the operator precise command over the vessel. The pilot seat is equipped with electric lifts that enable a quick transition from seated to standing driving positions. This ergonomic and technologically advanced helm setup enhances control and comfort during operation.
Power and Performance
Performance on the Cobalt 343 is driven by twin 496 V8 engines, each producing 425 horsepower. The boat incorporates Cobalt's first-ever step-tall hull design, augmented by a padded keel and a knot's transom, which together contribute to exceptional stability and a smooth ride even in choppy seas. The hull design ensures the boat remains firmly planted on the water during straight runs and maintains excellent grip through turns. The engines feature a closed cooling system, an air-actuated single-point water drain system with an included air pump, and a single serpentine belt driving all components. The engine control module utilizes a motor oil microprocessor to optimize fuel mixture, knock control, and ignition timing independently for each cylinder, resulting in precise and efficient performance. The 343 measures 35 feet 4 inches in length overall with a beam of 9 feet 8 inches and a draft of 28 inches with the drive up, extending to 37 inches with the drive down. It weighs approximately 10,200 pounds with twin CERN drives and carries 200 gallons of fuel, meeting yacht certification standards. Economically, the boat cruises at 3,500 RPM, achieving 40.9 miles per hour with a fuel consumption of 31.5 gallons per hour, offering a range of 234 miles on a full tank. At wide-open throttle, it reaches 5,100 RPM and a top speed of 62.4 miles per hour.
Conclusion
The Cobalt 343 successfully blends high-performance engineering with the luxury and meticulous craftsmanship that the brand is known for. Its innovative hull design and powerful twin engines deliver thrilling speed and handling, while the thoughtfully designed interior and exterior spaces provide comfort and convenience for extended outings. With a top speed exceeding 60 miles per hour and a comprehensive suite of amenities, the 343 stands out as one of the most luxurious high-performance sport boats currently available.
Overview from around the web 2005 Cobalt 343
Customers appreciate the 2005 Cobalt 343 for its exceptional blend of performance, luxury, and innovative design
Many users highlight the boat's spacious interior, which offers comfortable seating and ample storage, making it perfect for entertaining and relaxing on the water. The high-quality materials and finishes have drawn compliments for their durability and aesthetic appeal. Performance-wise, boaters commonly praise the Cobalt 343 for its smooth ride and powerful engine options, providing a thrilling experience whether cruising or cutting through choppy waters. The handling is often described as responsive and easy, contributing to a feeling of security and confidence while navigating. Additional features such as the well-designed cockpit layout, stylish helm, and convenient amenities for both day trips and longer excursions receive positive feedback. The overall versatility of the boat, from water sports to casual outings, has made it a favored choice for both seasoned boaters and newcomers alike. In summary, the 2005 Cobalt 343 tends to be highlighted as a top-tier option, satisfying a variety of boating needs while exuding style and performance.
The Biggest Pros and Cons
The 2005 Cobalt 343 is a well-regarded luxury sport boat that offers a blend of performance, comfort, and style. Here are some pros and cons associated with this model:
Pros
Performance: The Cobalt 343 is equipped with powerful engines that deliver impressive speed and agility on the water, making it ideal for thrilling water sports or leisurely cruising.
Design and Aesthetics: Known for its sleek lines and elegant design, the Cobalt 343 features a high-quality finish and premium materials that enhance its visual appeal.
Comfort: The spacious layout provides ample seating and comfort for passengers, making it a great choice for social gatherings and long days on the water.
Amenities: This boat comes with a variety of luxurious features, including a well-appointed cockpit, a wet bar, and an impressive sound system, ensuring a pleasurable experience for all aboard.
Build Quality: Cobalt is known for its attention to detail and excellent craftsmanship, which is evident in the durability and longevity of the boat.
Storage: The 343 offers various storage compartments, allowing for convenient organization of gear and personal belongings.
Cons
Price: As a luxury boat, the Cobalt 343 can be on the higher end of the price spectrum, which may not suit every budget.
Maintenance Costs: The quality and performance of the boat may come with higher maintenance and insurance costs compared to more budget-friendly options.
Fuel Consumption: Due to its powerful engines, fuel consumption can be significant, especially if you're using the boat at higher speeds frequently.
Weight: While its weight contributes to stability, it may impact trailering and maneuverability in certain situations.
Limited to Good Weather: Like most boats, the Cobalt 343 is best enjoyed in favorable weather conditions, which may limit usage during inclement weather.
Specific Use: It is primarily designed for leisurely cruising and water sports; those seeking a more versatile or rugged vessel may find it less suitable for extensive rough-water conditions.
Made For
The 2005 Cobalt 343 is ideal for boating enthusiasts seeking a perfect blend of luxury, performance, and versatility. Whether you're an avid day cruiser or someone who enjoys extended weekend getaways, this vessel caters to both experiences with style and comfort. Families will appreciate the spacious layout, offering ample seating and room for socializing, making it perfect for gatherings on the water. The boat's elegant design and high-end finishes create an inviting atmosphere for entertaining friends or enjoying a peaceful day at sea. For those who value performance, the Cobalt 343 is equipped with powerful engines that deliver exceptional speed and handling, making it suitable for water sports enthusiasts and thrill-seekers. The deep-V hull provides a smooth ride, even in rough waters, ensuring a comfortable experience for everyone onboard. Finally, seasoned boaters will appreciate the meticulous craftsmanship and attention to detail in every aspect of the Cobalt 343. Its reliable construction and premium materials reflect a commitment to quality that ensures years of enjoyment on the water. Whether for leisure or adventure, the 2005 Cobalt 343 is designed to meet the needs of diverse boaters seeking quality and performance.
Finance your dream boat!
Finance your dream boat!
Be the first to know when similar boats hit the market
Get notified when new boats become available
Boats For Sale in Washington, United States Similar to the 2005 Cobalt 343
Compare with similar boats and find the perfect one for you.
 2005 Cobalt 343 | |||||
|---|---|---|---|---|---|
| $89,000 | $89,900 | $82,900 | $99,850 | $44,900 | $135,540 |
| Bellevue | Bellevue | Bellevue | Chelan | Bellevue | Bellevue |
| 35' | 25' | 32' | 35' | 27' | 23' |
| 3' | - | - | - | - | - |
| MerCruiser | - | - | Mercury | - | - |
| - | - | - | 425 hp | - | - |
| 21 | 21 | 21 | 376 | 21 | 21 |
Other 2005 Cobalt 343 For Sale in Washington, United States
Other Cobalt boats for sale in Washington, United States
Meet the Broker
Address
Boat Location
Contact Jeff Brown Yachts - San Diego about 2005 Cobalt 343
2330 Shelter Island Drive, Suite 105, San Diego, CA, 92106
Login with Google