General Specifications
HP / kW
40 HP / 29.8 kW
Displacement
592 cc (36.1 cu in.)
Cylinders
2 (Inline)
WOT RPM
4500 - 5500
Weight
72 kg / 159 lbs
Drive & Lower Unit
Gear Ratio
2.00:1
Shaft Length
15, 20
Electrical System
Alternator Output 80 Watts
Starting System Manual/Electric
Technical Maintenance Toolkit
Verified service specifications for the Mariner 40hp (Yamaha-built 6E9) (1990)
Lubrication
Engine Oil
50:1 Pre-mix
Gearcase Lube 440 ml
Ignition System
Spark Plug
NGK B8HS-10
Gap Setting 0.035"
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 4500-5500
Alternator 80W
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the Mariner 40hp (Yamaha-built 6E9) is typically found on a plate located on the transom bracket.
Technical Toolkit
Maintenance Compatibility
These models share common service parts with the Mariner 40hp (Yamaha-built 6E9):
Model Evolution
History of the Mariner 40HP series over the years:
Category Discovery
Reference Data
Information compiled from Mariner Marine factory service manuals and original sales literature published in 1990.