General Specifications
HP / kW
90 HP / 67.0 kW
Displacement
2100 cc (128.2 cu in.)
Cylinders
4 (Inline)
WOT RPM
5000 - 6000
Weight
163 kg / 359 lbs
Drive & Lower Unit
Gear Ratio
2.07:1
Shaft Length
20", 25"
Electrical System
Alternator Output 441 Watts
Starting System Electric
Technical Maintenance Toolkit
Verified service specifications for the Mercury 90hp EFI (2.1L) (2015)
Lubrication
Engine Oil
Mercury 10W-30
Oil Capacity 5.2 Liters
Gearcase Lube 800 ml
Ignition System
Spark Plug
NGK ZFR5F
Gap Setting 0.032"
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 5000-6000
Alternator 441W
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the Mercury 90hp EFI (2.1L) is typically found on a plate located on the transom bracket.
Technical Toolkit
Maintenance Compatibility
These models share common service parts with the Mercury 90hp EFI (2.1L):
Model Evolution
History of the Mercury 90HP series over the years:
Category Discovery
Reference Data
Information compiled from Mercury Marine factory service manuals and original sales literature published in 2015.