FOR SALE 1990 Mercury Marine MerCruiser 4.3 L 262 205 HP V6 Boat engine motor FRESH WATER. Very clean and excellent condition.

The 1990 MerCruiser 4.3L (262 CID) 205 HP is a marinized General Motors 90°V6 engine. It was designed for use with sterndrives (like the Alpha One) and is widely known for delivering reliable V6 power through a 4-barrel carburetor.

Core Specifications

• Horsepower : 205 HP (at the propshaft)
• Displacement : 262 CID(4.3 Liters)
• Configuration : 90V6
• Bore & Stroke : 4.00″ X 3.48″ (101.6 mm X 88.4 mm)
• Compression Ratio : 9.4: 1
• Fuel System : 4-barrel carburetor (typically a Rochester)

Performance & Operation

• Full Throttle (WOT) RPM Range : 4400 – 4800 RPM
• Idle RPM (in Neutral) : 650 RPM
• Oil Pressure at 2000 RPM : 30 – 70PSI
• Minimum Oil Pressure at Idle : 4PSI
• Operating Temperature : Thermostat rated for 160F(71C)

Tune-Up & Electrical

• Electrical System : 12-Volt, Negative (–) ground
• Alternator Output : 55 or 65 Amp
• Minimum Battery Requirements : 375 CCA / 475 MCA (or 90Ah)
• Firing Order : 1-6-5-4-3-2
• Spark Plug Gap : .045″ (1.1 mm)
• Timing at Idle : 10° BTDC