General Specifications
HP / kW
20 HP / 14.9 kW
Displacement
400 cc (24.4 cu in.)
Cylinders
2 (Inline)
WOT RPM
5000 - 5500
Weight
48 kg / 106 lbs
Drive & Lower Unit
Gear Ratio
2.00:1
Shaft Length
15, 20
Electrical System
Alternator Output 144 Watts
Starting System Manual/Electric
Technical Maintenance Toolkit
Verified service specifications for the Mariner 20hp (2-Stroke) (1995)
Lubrication
Engine Oil
TC-W3 (50:1)
Gearcase Lube 260 ml
Ignition System
Spark Plug
NGK BP8H-N-10
Gap Setting 0.040"
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 5000-5500
Alternator 144W
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the Mariner 20hp (2-Stroke) is typically found on a plate located on the transom bracket.
Technical Toolkit
Maintenance Compatibility
These models share common service parts with the Mariner 20hp (2-Stroke):
Model Evolution
History of the Mariner 20HP series over the years:
Category Discovery
Reference Data
Information compiled from Mariner Marine factory service manuals and original sales literature published in 1995.