Cobalt 343 (2004-)
(w/ 2 x 425-hp MerCruiser 496 MAG HO)

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Cobalt blends exquisite appearance and aggressive performance with its new 343. This high-performance boat will steal your breath away, not only with her speed, but with refined features and captivating style.

Key Features

  • 10 Year Hull/Deck Warranty
  • 5 Year Powertrain Warranty
  • Closed Cooling System-Twin Engines
  • Composite Transom
  • Fiberglass Stringer System
  • Kevlar Reinforced Hull
  • Hydraulic External Steering
  • Ignition Safety Switch
  • Gaffrig Engine Controls
  • GPS Unit
  • Double Wide Helm Seat
  • Extended Swim Platform
  • AM/FM CD stereo

Specifications

Cobalt 343 (2004-) Specifications
Length Overall 35'4'' Dry Weight 10,200 lbs
Beam 9'8'' Tested Weight N/A
Draft 37'' drives down Fuel Cap 200 gal.
Deadrise/Transom 24.5 deg. Water Cap 10 gal.
Max Headroom N/A Bridge Clearance 69''
Prices, features, designs, and equipment are subject to change. Please see your local dealer or visit the builder's website for the latest information available on this boat model.

Engine Options

Cobalt 343 (2004-) Engine options
Std. Power Not Available
Tested Power 2 x 425-hp MerCruiser 496 MAG HO
Opt. Power 2 x 375-hp MerCruiser 496 Mag MPI Bravo 1
2 x 425-hp MerCruiser 496 Mag HO Bravo 1 XR
2 x 500-hp MerCruiser EFI Bravo 1 XR
2 x 350-hp Volvo D-6 Diesels

Cobalt 343 (2004-) Line Drawing

Cobalt 343 (2004-) Photo Gallery

Cobalt 343 (2004-) Cobalt343run.jpg Cobalt 343 (2004-) Cobalt343inside.jpg
High Performance Style

The two level transom and swim platform get you close to the water while the wraparound stainless bar protects the boat from the dock and is a great handhold.

Room Below

The door to the cabin is more like that of a mega yacht or aircraft, no sliding door here! Inside is a port to starboard V-bench.

Cobalt 343 (2004-) Cobalt343helm.jpg Cobalt 343 (2004-) Cobalt343top.jpg
Futuristic Helm

This center console is more like an airplane cockpit with a bank of rocker switches to the left and two rows of gauges.

Transom Features

Two individual sun pads and two stern benches are divided by a large walkthrough. Double hinged seats also have storage below.

Cobalt 343 (2004-) Captain's Report

Tested By Capt. Chris Kelly

Cobalt’s attention to detail goes way beyond the obvious and visible. The 343 is going to send chills up the spine of her competitor’s and a thrill through your body as she attacks the water with a vengeance. The 343 is built to deliver high performance style and delivers with attitude. She stays stuck to the water on the straightaway and clings to the water with ease through the turns.

Down Below

The door to the cabin is more like that of a mega yacht or aircraft, no sliding door here! Inside is a port to starboard V-bench. In one corner is an optional flat panel TV for your movies at night. The enclosed head is made up of a portable toliet, sink and vanity.

Cockpit Features

Rear facing bench seats create a large conversation pit at the stern. The seat is double hinged with cavernous storage below. Cobalt leaps to the future with its helm station. This center console is more like an airplane cockpit with a bank of rocker switches to the left and two rows of gauges. Water/air temperature and depth digital gauges are next to the rocker switches. Gaffrig instrumentation and Lavorsi precision engine controls will keep you in charge. The seats have electric lifts that take you from a seated driving position to standing in just a few seconds.

The side decks are wide for easy movement and even the fender locker has gas assist lifts. All the deck water trails down the sides and passes through the fender locker and out the bottom to the keel.

Transom

Two individual sun pads and two stern benches are divided by a large walkthrough. Double hinged seats also have storage below. An inflator for your water toys is in one, and you have a tool kit in the other. Under the port bench is the battery switches, main breakers and space for canvas poles. Everything has its place on this boat, and each side has cup holders and a horizontal grab rail.

The two level transom and swim platform get you close to the water while the wraparound stainless bar protects the boat from the dock and is a great handhold. Flip a lever and the dive style ladder is deployed with ease. Stainless steel vents and fins bring fresh air to the engine while inside the starboard compartment is the swim shower and water hookup. When it comes time to get the engine the hatch lifts easily with one hand.

Power Plant

These 496 V-8 engines deliver 425-hp each. Everything is easy to reach with one hand, and the oil filter is on top. Closed cooling is standard. The oil dip stick has an easy oil drain system connection, and the water drain system has an air-actuated single point drain system which had an air pump included. A single serpentine belt drives all the parts. The engine control module uses a Motorola microprocessor and optimizes the fuel mixture, knock control and ignition timing independently for each cylinder resulting in improved, precise performance.

Specs

The 343 is 35’4” overall in length and 9’8” across the beam. Draft is 28” with the drives up and 37” with the drives down. She weighs in at 10,200 lbs with twin stern drives and carries 200 gallons of fuel and is yacht certified.

Performance

The 343 cruised most economically at 3500 rpm traveling 40.9 mph for a fuel burn of 31.5 gph. At wide open throttle she was turning 5100 rpm and delivered a top speed of 62.4mph. At cruise you can expect 234 miles on a full tank of fuel.

Cobalt 343 (2004-) Test Result Highlights

  • Top speed for the Cobalt 343 (2004-) is 62.4 mph (100.4 kph), burning 69.2 gallons per hour (gph) or 261.92 liters per hour (lph).

  • Best cruise for the Cobalt 343 (2004-) is 40.9 mph (65.8 kph), and the boat gets 1.30 miles per gallon (mpg) or 0.55 kilometers per liter (kpl), giving the boat a cruising range of 234 miles (376.59 kilometers).

  • Tested power is 2 x 425-hp MerCruiser 496 MAG HO.
For complete test results including fuel consumption, range and sound levels
go to our Test Results section.


Standard and Optional Equipment

Cobalt 343 (2004-) Standard and Optional Equipment
Marine Electronics
GPS/Chart Standard
Systems
Air Cond./Heat Optional
Battery Charger/Converter Optional
CD Stereo Standard
Head: Fixed Standard
Power Steering Standard
Shore Power Optional
Trim Tabs Standard
TV/DVD Optional
Windlass Optional
Exterior Features
Outlet: 12-Volt Acc Standard
Swim Ladder Standard
Swim Platform Standard
Transom Shower Optional
Canvas
Bimini Top Optional
Cockpit Cover Optional
Boats More Than 30 Feet
Generator Optional

Standard = Standard Optional = Optional

Cobalt 343 (2004-) Warranty

Cobalt 343 (2004-) Warranty Information
Warranties change from time to time. While BoatTEST.com has tried to ensure the most up-to-date warranty offered by each builder, it does not guarantee the accuracies of the information presented below. Please check with the boat builder or your local dealer before you buy any boat.
Hull Warranty
Years 10-Year
Transferable Yes
Extendable No
Link http://www.cobaltboats.com/info/warranty.html
Deck Warranty
Years 10-Years
Transferable 10-Year transferable protection
Extendable No
Link http://www.cobaltboats.com/info/warranty.html
Engine Warranty
Years 5-Year
Extendable No
Link http://www.cobaltboats.com/info/warranty.html
Powertrain Warranty
Years 5-Year
Transferable 5-Year transferable protection
Link http://www.cobaltboats.com/info/warranty.html
Gelcoat Warranty
Years 2-Year
Transferable 2-Year transferable protection
Link http://www.cobaltboats.com/info/warranty.html
Accessories Warranty
Years 1-2 Year
Transferable Yes
Link http://www.cobaltboats.com/info/warranty.html
Certifications
NMMA Certification Yes

Cobalt 343 (2004-) Price

Cobalt 343 (2004-) Price
Pricing Range $229,051.00
Prices, features, designs, and equipment are subject to change. Please see your local dealer or visit the builder's website for the latest information available on this boat model.


Test Results   (Printer Friendly Page)

Test Power: 2 x 425-hp MerCruiser 496 MAG HO
  Range  
RPM MPH Knots Total GPH MPG NMPG Stat. Mile NM   KM    KPH    LPH    KPL   dBA
650 4.7 4.0 3.1 1.5 1.3 270 235 435 7.60 11.73 0.64 66
1000 6.6 5.7 5.2 1.3 1.1 228 199 367 10.60 19.68 0.54 69
1500 9.2 8.0 9.0 1.0 0.9 184 160 296 14.80 34.07 0.43 72
2000 11.2 9.7 13.8 0.8 0.7 145 126 233 18.00 52.24 0.34 77
2500 16.1 14.0 20.8 0.8 0.7 139 121 224 25.90 78.74 0.33 78
3000 30.1 26.2 23.1 1.3 1.1 235 204 378 48.40 87.44 0.55 81
3500 40.9 35.6 31.5 1.3 1.1 234 203 377 65.80 119.24 0.55 85
4000 46.3 40.2 37.8 1.2 1.1 220 192 354 74.50 143.09 0.52 86
4500 53.9 46.9 47.9 1.1 1.0 203 176 327 86.70 181.32 0.48 87
5000 56.9 49.5 68.4 0.8 0.7 150 130 241 91.60 258.92 0.35 92
5100 62.4 54.2 69.2 0.9 0.8 162 141 261 100.40 261.95 0.38 92

All fuel consumption numbers are the total for all engines in the boat. Speeds are measured with Stalker ProSports radar gun or GPS. Fuel consumption (gallons per hour) measured with Floscan digital fuel-flow meter or by on-board factory-installed diagnostic instruments. Range is based on 90% of published fuel capacity. Sound levels determined using Radio Shack digital decibel meter on A scale. 68 dBA is the level of normal conversation.

Performance Chart

Performance Chart

Test Conditions

Test Power: 2 x 425-hp MerCruiser 496 MAG HO
Time To Plane 5.7 sec.
0 to 30 9.4 sec.
Test Power 2 x 425-hp MerCruiser 496 MAG HO
Transmission N/A
Ratio 1.50:1
Props 24-inch pitch
Load 3 pers, 1/3 fuel, no water, min. gear
Climate 65 deg., 60% humid., wind: 10 knots; seas: 1-2 feet