General Specifications
HP / kW
20 HP / 14.9 kW
Displacement
395 cc (24.1 cu in.)
Cylinders
2 (Inline)
WOT RPM
4500 - 5500
Weight
48 kg / 106 lbs
Drive & Lower Unit
Gear Ratio
2.08
Shaft Length
15", 20"
Electrical System
Alternator Output 126 Watts
Starting System Manual
Technical Maintenance Toolkit
Verified service specifications for the Mariner 20hp International (Yamaha-built 653) (1990)
Lubrication
Engine Oil
TC-W3 2-Stroke
Gearcase Lube 260 ml
Ignition System
Spark Plug
NGK B7HS
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 4500-5500
Alternator 126W
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the Mariner 20hp International (Yamaha-built 653) 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 International (Yamaha-built 653):
Category Discovery
Reference Data
Information compiled from Mariner Marine factory service manuals and original sales literature published in 1990.