General Specifications
HP / kW
2.5 HP / 1.9 kW
Displacement
85 cc (5.2 cu in.)
Cylinders
1 (Inline)
WOT RPM
5250 - 6250
Weight
17 kg / 37 lbs
Drive & Lower Unit
Gear Ratio
2.15:1
Shaft Length
15
Electrical System
Alternator Output None / Magneto Only
Starting System Manual
Technical Maintenance Toolkit
Verified service specifications for the Mercury 2.5hp FourStroke (2024)
Lubrication
Engine Oil
10W-30 FC-W
Oil Capacity 0.3 Liters
Gearcase Lube 180 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 5250-6250
Alternator None
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the Mercury 2.5hp FourStroke is typically found on a plate located on the transom bracket.
Technical Toolkit
Maintenance Compatibility
These models share common service parts with the Mercury 2.5hp FourStroke:
Model Evolution
History of the Mercury 2.5HP series over the years:
Standalone production year.
Category Discovery
Reference Data
Information compiled from Mercury Marine factory service manuals and original sales literature published in 2024.