General Specifications
HP / kW
20 HP / 14.9 kW
Displacement
333 cc (20.3 cu in.)
Cylinders
2 (Inline)
WOT RPM
5700 - 6200
Weight
45 kg / 99 lbs
Drive & Lower Unit
Gear Ratio
2.15:1
Shaft Length
15, 20
Electrical System
Alternator Output 145 Watts
Starting System Electric/Manual
Technical Maintenance Toolkit
Verified service specifications for the Mercury 20hp FourStroke EFI (2024)
Lubrication
Engine Oil
10W-30 FC-W
Oil Capacity 1.8 Liters
Gearcase Lube 350 ml
Ignition System
Spark Plug
NGK DCPR6E
Gap Setting 0.035"
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 5700-6200
Alternator 145W
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the Mercury 20hp FourStroke EFI is typically found on a plate located on the transom bracket.
Technical Toolkit
Maintenance Compatibility
These models share common service parts with the Mercury 20hp FourStroke EFI:
Category Discovery
Reference Data
Information compiled from Mercury Marine factory service manuals and original sales literature published in 2024.