This popular model powers everything from family runabouts to houseboats. Its smooth power delivery and excellent fuel economy make it a great choice for boaters who want lots of torque without the extra weight or size of a V-8. The 4.3 TKS features MerCruiser’s exclusive Turn-Key Start (TKS) system. This patented feature eliminates the hassle of starting a cold engine. Simply turn the key – no choke, pumping or priming are required. The entire MerCruiser gas lineup features Turn Key Starting. No other engine manufacturer can match that.


  • Thunderbolt V Hi-Energy Ignition and platinum-tipped spark plugs ensure reliable starts
  • Dry-joint exhaust eliminates the chance for water to enter engine through leaky gaskets
  • Water-separating fuel filter helps protect fuel system and engine against damage
  • Industry-exclusive 3-year limited corrosion failure warranty
  • Proven GM cast iron block V6 power for years of reliable operation
  • EDP-coated exhaust elbows resist temperature and corrosion for long life
  • Serpentine belt system for longer belt life


  • Dual Plane intake manifold for improved fuel atomization means more power & torque
  • Revised fuel calibration for more crisp acceleration and improved running quality
  • Standard anti-feedback power steering helps reduces operator fatigue and makes boat handling a breeze
  • Low restriction flame arrestor for added horsepower and torque


  • 3-year/300 hour maintenance interval on many periodic service items saves time and money
  • Easy Oil Drain system is cleaner and makes periodic service simple and less work
  • Color-coded service points makes checking fluid levels simple and straightforward
  • Operates on easy to find, less expensive 87 octane fuel
  • Engine-mounted drive lube monitor for easy lube check or add from inside the boat
  • No tools required to drain water from engine with blue drain plugs


  • Turn Key Starting for easy starts, cold or hot, every time with no choking or priming
  • Helm-mounted Audio Warning System monitors oil pressure, engine temperature and drive lube level and provides instant alarm if any of these vary from normal range
  • MerCathode galvanic corrosion prevention system standard on Bravo models, available on Alpha models, offers unmatched active electronic corrosion protection
  • Large 65 Amp alternator provides plenty of power for popular onboard electronics


Power 190HP (140 KW)
Full Throttle Range 4400 - 4800 RPM
Displacement 262 CID (4.3L)
Engine Type V6
Bore & Stroke 4.00" X 3.48" (101mm X 88mm)
Compression Ratio 9.4:1
Fuel Requirement 87 Octane (R+M)/2
Fuel System 2V Carb with Turn Key Start & Electric Fuel Pump
Induction System Dual Plane Iron Intake Manifold
Ignition System Thunderbolt V
Charging System 65 Amp/917 Watt Alternator
Water Drain System Multi Point Drain - Hand Removable Blue Drain Plugs
Exhaust System EDP Coated Iron Manifold with EDP Coated Dry-joint Elbow
Cooling System Thermostatically Controlled, Raw Water
Accessory Drive System Serpentine Belt
Recommended Engine Oil MerCruiser Full Synthetic Engine Oil - SAE 20W-40
Engine Guardian System Low Oil Pressure, High Coolant Temperature, Low Drive Lube
Alpha Ratios 1.62, 1.81, 2.0(H)
Bravo One Ratios N/A
Bravo Two Ratios 2.00, 2.20
Bravo Three Ratios 2.20, 2.43
Dimensions (LxWxH) in 28 x 30 x 21
Dimensions (LxWxH) mm 696 x 740 x 533
Weight w/ Alpha (lbs./kg) 848/385
Weight w/ Bravo One (lbs./kg) N/A
Weight w/ Bravo Two (lbs./kg) 893/405
Weight w/ Bravo Three (lbs./kg) 902/410
Optional Freshwater Cooling Available
List price: $0.00
Price: $5,995.00